web/Zend/Form/Element.php
changeset 0 4eba9c11703f
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/Zend/Form/Element.php	Mon Dec 13 18:29:26 2010 +0100
@@ -0,0 +1,2250 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Form
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+
+/** @see Zend_Filter */
+require_once 'Zend/Filter.php';
+
+/** @see Zend_Form */
+require_once 'Zend/Form.php';
+
+/** @see Zend_Validate_Interface */
+require_once 'Zend/Validate/Interface.php';
+
+/** @see Zend_Validate_Abstract */
+require_once 'Zend/Validate/Abstract.php';
+
+/**
+ * Zend_Form_Element
+ *
+ * @category   Zend
+ * @package    Zend_Form
+ * @subpackage Element
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: Element.php 22464 2010-06-19 17:31:21Z alab $
+ */
+class Zend_Form_Element implements Zend_Validate_Interface
+{
+    /**
+     * Element Constants
+     */
+    const DECORATOR = 'DECORATOR';
+    const FILTER    = 'FILTER';
+    const VALIDATE  = 'VALIDATE';
+
+    /**
+     * Default view helper to use
+     * @var string
+     */
+    public $helper = 'formText';
+
+    /**
+     * 'Allow empty' flag
+     * @var bool
+     */
+    protected $_allowEmpty = true;
+
+    /**
+     * Flag indicating whether or not to insert NotEmpty validator when element is required
+     * @var bool
+     */
+    protected $_autoInsertNotEmptyValidator = true;
+
+    /**
+     * Array to which element belongs
+     * @var string
+     */
+    protected $_belongsTo;
+
+    /**
+     * Element decorators
+     * @var array
+     */
+    protected $_decorators = array();
+
+    /**
+     * Element description
+     * @var string
+     */
+    protected $_description;
+
+    /**
+     * Should we disable loading the default decorators?
+     * @var bool
+     */
+    protected $_disableLoadDefaultDecorators = false;
+
+    /**
+     * Custom error messages
+     * @var array
+     */
+    protected $_errorMessages = array();
+
+    /**
+     * Validation errors
+     * @var array
+     */
+    protected $_errors = array();
+
+    /**
+     * Separator to use when concatenating aggregate error messages (for
+     * elements having array values)
+     * @var string
+     */
+    protected $_errorMessageSeparator = '; ';
+
+    /**
+     * Element filters
+     * @var array
+     */
+    protected $_filters = array();
+
+    /**
+     * Ignore flag (used when retrieving values at form level)
+     * @var bool
+     */
+    protected $_ignore = false;
+
+    /**
+     * Does the element represent an array?
+     * @var bool
+     */
+    protected $_isArray = false;
+
+    /**
+     * Is the error marked as in an invalid state?
+     * @var bool
+     */
+    protected $_isError = false;
+
+    /**
+     * Has the element been manually marked as invalid?
+     * @var bool
+     */
+    protected $_isErrorForced = false;
+
+    /**
+     * Element label
+     * @var string
+     */
+    protected $_label;
+
+    /**
+     * Plugin loaders for filter and validator chains
+     * @var array
+     */
+    protected $_loaders = array();
+
+    /**
+     * Formatted validation error messages
+     * @var array
+     */
+    protected $_messages = array();
+
+    /**
+     * Element name
+     * @var string
+     */
+    protected $_name;
+
+    /**
+     * Order of element
+     * @var int
+     */
+    protected $_order;
+
+    /**
+     * Required flag
+     * @var bool
+     */
+    protected $_required = false;
+
+    /**
+     * @var Zend_Translate
+     */
+    protected $_translator;
+
+    /**
+     * Is translation disabled?
+     * @var bool
+     */
+    protected $_translatorDisabled = false;
+
+    /**
+     * Element type
+     * @var string
+     */
+    protected $_type;
+
+    /**
+     * Array of initialized validators
+     * @var array Validators
+     */
+    protected $_validators = array();
+
+    /**
+     * Array of un-initialized validators
+     * @var array
+     */
+    protected $_validatorRules = array();
+
+    /**
+     * Element value
+     * @var mixed
+     */
+    protected $_value;
+
+    /**
+     * @var Zend_View_Interface
+     */
+    protected $_view;
+
+    /**
+     * Is a specific decorator being rendered via the magic renderDecorator()?
+     *
+     * This is to allow execution of logic inside the render() methods of child
+     * elements during the magic call while skipping the parent render() method.
+     *
+     * @var bool
+     */
+    protected $_isPartialRendering = false;
+
+    /**
+     * Constructor
+     *
+     * $spec may be:
+     * - string: name of element
+     * - array: options with which to configure element
+     * - Zend_Config: Zend_Config with options for configuring element
+     *
+     * @param  string|array|Zend_Config $spec
+     * @param  array|Zend_Config $options
+     * @return void
+     * @throws Zend_Form_Exception if no element name after initialization
+     */
+    public function __construct($spec, $options = null)
+    {
+        if (is_string($spec)) {
+            $this->setName($spec);
+        } elseif (is_array($spec)) {
+            $this->setOptions($spec);
+        } elseif ($spec instanceof Zend_Config) {
+            $this->setConfig($spec);
+        }
+
+        if (is_string($spec) && is_array($options)) {
+            $this->setOptions($options);
+        } elseif (is_string($spec) && ($options instanceof Zend_Config)) {
+            $this->setConfig($options);
+        }
+
+        if (null === $this->getName()) {
+            require_once 'Zend/Form/Exception.php';
+            throw new Zend_Form_Exception('Zend_Form_Element requires each element to have a name');
+        }
+
+        /**
+         * Extensions
+         */
+        $this->init();
+
+        /**
+         * Register ViewHelper decorator by default
+         */
+        $this->loadDefaultDecorators();
+    }
+
+    /**
+     * Initialize object; used by extending classes
+     *
+     * @return void
+     */
+    public function init()
+    {
+    }
+
+    /**
+     * Set flag to disable loading default decorators
+     *
+     * @param  bool $flag
+     * @return Zend_Form_Element
+     */
+    public function setDisableLoadDefaultDecorators($flag)
+    {
+        $this->_disableLoadDefaultDecorators = (bool) $flag;
+        return $this;
+    }
+
+    /**
+     * Should we load the default decorators?
+     *
+     * @return bool
+     */
+    public function loadDefaultDecoratorsIsDisabled()
+    {
+        return $this->_disableLoadDefaultDecorators;
+    }
+
+    /**
+     * Load default decorators
+     *
+     * @return Zend_Form_Element
+     */
+    public function loadDefaultDecorators()
+    {
+        if ($this->loadDefaultDecoratorsIsDisabled()) {
+            return $this;
+        }
+
+        $decorators = $this->getDecorators();
+        if (empty($decorators)) {
+            $getId = create_function('$decorator',
+                                     'return $decorator->getElement()->getId()
+                                             . "-element";');
+            $this->addDecorator('ViewHelper')
+                 ->addDecorator('Errors')
+                 ->addDecorator('Description', array('tag' => 'p', 'class' => 'description'))
+                 ->addDecorator('HtmlTag', array('tag' => 'dd',
+                                                 'id'  => array('callback' => $getId)))
+                 ->addDecorator('Label', array('tag' => 'dt'));
+        }
+        return $this;
+    }
+
+    /**
+     * Set object state from options array
+     *
+     * @param  array $options
+     * @return Zend_Form_Element
+     */
+    public function setOptions(array $options)
+    {
+        if (isset($options['prefixPath'])) {
+            $this->addPrefixPaths($options['prefixPath']);
+            unset($options['prefixPath']);
+        }
+
+        if (isset($options['disableTranslator'])) {
+            $this->setDisableTranslator($options['disableTranslator']);
+            unset($options['disableTranslator']);
+        }
+
+        unset($options['options']);
+        unset($options['config']);
+
+        foreach ($options as $key => $value) {
+            $method = 'set' . ucfirst($key);
+
+            if (in_array($method, array('setTranslator', 'setPluginLoader', 'setView'))) {
+                if (!is_object($value)) {
+                    continue;
+                }
+            }
+
+            if (method_exists($this, $method)) {
+                // Setter exists; use it
+                $this->$method($value);
+            } else {
+                // Assume it's metadata
+                $this->setAttrib($key, $value);
+            }
+        }
+        return $this;
+    }
+
+    /**
+     * Set object state from Zend_Config object
+     *
+     * @param  Zend_Config $config
+     * @return Zend_Form_Element
+     */
+    public function setConfig(Zend_Config $config)
+    {
+        return $this->setOptions($config->toArray());
+    }
+
+
+    // Localization:
+
+    /**
+     * Set translator object for localization
+     *
+     * @param  Zend_Translate|null $translator
+     * @return Zend_Form_Element
+     */
+    public function setTranslator($translator = null)
+    {
+        if (null === $translator) {
+            $this->_translator = null;
+        } elseif ($translator instanceof Zend_Translate_Adapter) {
+            $this->_translator = $translator;
+        } elseif ($translator instanceof Zend_Translate) {
+            $this->_translator = $translator->getAdapter();
+        } else {
+            require_once 'Zend/Form/Exception.php';
+            throw new Zend_Form_Exception('Invalid translator specified');
+        }
+        return $this;
+    }
+
+    /**
+     * Retrieve localization translator object
+     *
+     * @return Zend_Translate_Adapter|null
+     */
+    public function getTranslator()
+    {
+        if ($this->translatorIsDisabled()) {
+            return null;
+        }
+
+        if (null === $this->_translator) {
+            return Zend_Form::getDefaultTranslator();
+        }
+        return $this->_translator;
+    }
+
+    /**
+     * Does this element have its own specific translator?
+     *
+     * @return bool
+     */
+    public function hasTranslator()
+    {
+        return (bool)$this->_translator;
+    }
+
+    /**
+     * Indicate whether or not translation should be disabled
+     *
+     * @param  bool $flag
+     * @return Zend_Form_Element
+     */
+    public function setDisableTranslator($flag)
+    {
+        $this->_translatorDisabled = (bool) $flag;
+        return $this;
+    }
+
+    /**
+     * Is translation disabled?
+     *
+     * @return bool
+     */
+    public function translatorIsDisabled()
+    {
+        return $this->_translatorDisabled;
+    }
+
+    // Metadata
+
+    /**
+     * Filter a name to only allow valid variable characters
+     *
+     * @param  string $value
+     * @param  bool $allowBrackets
+     * @return string
+     */
+    public function filterName($value, $allowBrackets = false)
+    {
+        $charset = '^a-zA-Z0-9_\x7f-\xff';
+        if ($allowBrackets) {
+            $charset .= '\[\]';
+        }
+        return preg_replace('/[' . $charset . ']/', '', (string) $value);
+    }
+
+    /**
+     * Set element name
+     *
+     * @param  string $name
+     * @return Zend_Form_Element
+     */
+    public function setName($name)
+    {
+        $name = $this->filterName($name);
+        if ('' === $name) {
+            require_once 'Zend/Form/Exception.php';
+            throw new Zend_Form_Exception('Invalid name provided; must contain only valid variable characters and be non-empty');
+        }
+
+        $this->_name = $name;
+        return $this;
+    }
+
+    /**
+     * Return element name
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->_name;
+    }
+
+    /**
+     * Get fully qualified name
+     *
+     * Places name as subitem of array and/or appends brackets.
+     *
+     * @return string
+     */
+    public function getFullyQualifiedName()
+    {
+        $name = $this->getName();
+
+        if (null !== ($belongsTo = $this->getBelongsTo())) {
+            $name = $belongsTo . '[' . $name . ']';
+        }
+
+        if ($this->isArray()) {
+            $name .= '[]';
+        }
+
+        return $name;
+    }
+
+    /**
+     * Get element id
+     *
+     * @return string
+     */
+    public function getId()
+    {
+        if (isset($this->id)) {
+            return $this->id;
+        }
+
+        $id = $this->getFullyQualifiedName();
+
+        // Bail early if no array notation detected
+        if (!strstr($id, '[')) {
+            return $id;
+        }
+
+        // Strip array notation
+        if ('[]' == substr($id, -2)) {
+            $id = substr($id, 0, strlen($id) - 2);
+        }
+        $id = str_replace('][', '-', $id);
+        $id = str_replace(array(']', '['), '-', $id);
+        $id = trim($id, '-');
+
+        return $id;
+    }
+
+    /**
+     * Set element value
+     *
+     * @param  mixed $value
+     * @return Zend_Form_Element
+     */
+    public function setValue($value)
+    {
+        $this->_value = $value;
+        return $this;
+    }
+
+    /**
+     * Filter a value
+     *
+     * @param  string $value
+     * @param  string $key
+     * @return void
+     */
+    protected function _filterValue(&$value, &$key)
+    {
+        foreach ($this->getFilters() as $filter) {
+            $value = $filter->filter($value);
+        }
+    }
+
+    /**
+     * Retrieve filtered element value
+     *
+     * @return mixed
+     */
+    public function getValue()
+    {
+        $valueFiltered = $this->_value;
+
+        if ($this->isArray() && is_array($valueFiltered)) {
+            array_walk_recursive($valueFiltered, array($this, '_filterValue'));
+        } else {
+            $this->_filterValue($valueFiltered, $valueFiltered);
+        }
+
+        return $valueFiltered;
+    }
+
+    /**
+     * Retrieve unfiltered element value
+     *
+     * @return mixed
+     */
+    public function getUnfilteredValue()
+    {
+        return $this->_value;
+    }
+
+    /**
+     * Set element label
+     *
+     * @param  string $label
+     * @return Zend_Form_Element
+     */
+    public function setLabel($label)
+    {
+        $this->_label = (string) $label;
+        return $this;
+    }
+
+    /**
+     * Retrieve element label
+     *
+     * @return string
+     */
+    public function getLabel()
+    {
+        $translator = $this->getTranslator();
+        if (null !== $translator) {
+            return $translator->translate($this->_label);
+        }
+
+        return $this->_label;
+    }
+
+    /**
+     * Set element order
+     *
+     * @param  int $order
+     * @return Zend_Form_Element
+     */
+    public function setOrder($order)
+    {
+        $this->_order = (int) $order;
+        return $this;
+    }
+
+    /**
+     * Retrieve element order
+     *
+     * @return int
+     */
+    public function getOrder()
+    {
+        return $this->_order;
+    }
+
+    /**
+     * Set required flag
+     *
+     * @param  bool $flag Default value is true
+     * @return Zend_Form_Element
+     */
+    public function setRequired($flag = true)
+    {
+        $this->_required = (bool) $flag;
+        return $this;
+    }
+
+    /**
+     * Is the element required?
+     *
+     * @return bool
+     */
+    public function isRequired()
+    {
+        return $this->_required;
+    }
+
+    /**
+     * Set flag indicating whether a NotEmpty validator should be inserted when element is required
+     *
+     * @param  bool $flag
+     * @return Zend_Form_Element
+     */
+    public function setAutoInsertNotEmptyValidator($flag)
+    {
+        $this->_autoInsertNotEmptyValidator = (bool) $flag;
+        return $this;
+    }
+
+    /**
+     * Get flag indicating whether a NotEmpty validator should be inserted when element is required
+     *
+     * @return bool
+     */
+    public function autoInsertNotEmptyValidator()
+    {
+        return $this->_autoInsertNotEmptyValidator;
+    }
+
+    /**
+     * Set element description
+     *
+     * @param  string $description
+     * @return Zend_Form_Element
+     */
+    public function setDescription($description)
+    {
+        $this->_description = (string) $description;
+        return $this;
+    }
+
+    /**
+     * Retrieve element description
+     *
+     * @return string
+     */
+    public function getDescription()
+    {
+        return $this->_description;
+    }
+
+    /**
+     * Set 'allow empty' flag
+     *
+     * When the allow empty flag is enabled and the required flag is false, the
+     * element will validate with empty values.
+     *
+     * @param  bool $flag
+     * @return Zend_Form_Element
+     */
+    public function setAllowEmpty($flag)
+    {
+        $this->_allowEmpty = (bool) $flag;
+        return $this;
+    }
+
+    /**
+     * Get 'allow empty' flag
+     *
+     * @return bool
+     */
+    public function getAllowEmpty()
+    {
+        return $this->_allowEmpty;
+    }
+
+    /**
+     * Set ignore flag (used when retrieving values at form level)
+     *
+     * @param  bool $flag
+     * @return Zend_Form_Element
+     */
+    public function setIgnore($flag)
+    {
+        $this->_ignore = (bool) $flag;
+        return $this;
+    }
+
+    /**
+     * Get ignore flag (used when retrieving values at form level)
+     *
+     * @return bool
+     */
+    public function getIgnore()
+    {
+        return $this->_ignore;
+    }
+
+    /**
+     * Set flag indicating if element represents an array
+     *
+     * @param  bool $flag
+     * @return Zend_Form_Element
+     */
+    public function setIsArray($flag)
+    {
+        $this->_isArray = (bool) $flag;
+        return $this;
+    }
+
+    /**
+     * Is the element representing an array?
+     *
+     * @return bool
+     */
+    public function isArray()
+    {
+        return $this->_isArray;
+    }
+
+    /**
+     * Set array to which element belongs
+     *
+     * @param  string $array
+     * @return Zend_Form_Element
+     */
+    public function setBelongsTo($array)
+    {
+        $array = $this->filterName($array, true);
+        if (!empty($array)) {
+            $this->_belongsTo = $array;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Return array name to which element belongs
+     *
+     * @return string
+     */
+    public function getBelongsTo()
+    {
+        return $this->_belongsTo;
+    }
+
+    /**
+     * Return element type
+     *
+     * @return string
+     */
+    public function getType()
+    {
+        if (null === $this->_type) {
+            $this->_type = get_class($this);
+        }
+
+        return $this->_type;
+    }
+
+    /**
+     * Set element attribute
+     *
+     * @param  string $name
+     * @param  mixed $value
+     * @return Zend_Form_Element
+     * @throws Zend_Form_Exception for invalid $name values
+     */
+    public function setAttrib($name, $value)
+    {
+        $name = (string) $name;
+        if ('_' == $name[0]) {
+            require_once 'Zend/Form/Exception.php';
+            throw new Zend_Form_Exception(sprintf('Invalid attribute "%s"; must not contain a leading underscore', $name));
+        }
+
+        if (null === $value) {
+            unset($this->$name);
+        } else {
+            $this->$name = $value;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Set multiple attributes at once
+     *
+     * @param  array $attribs
+     * @return Zend_Form_Element
+     */
+    public function setAttribs(array $attribs)
+    {
+        foreach ($attribs as $key => $value) {
+            $this->setAttrib($key, $value);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Retrieve element attribute
+     *
+     * @param  string $name
+     * @return string
+     */
+    public function getAttrib($name)
+    {
+        $name = (string) $name;
+        if (isset($this->$name)) {
+            return $this->$name;
+        }
+
+        return null;
+    }
+
+    /**
+     * Return all attributes
+     *
+     * @return array
+     */
+    public function getAttribs()
+    {
+        $attribs = get_object_vars($this);
+        foreach ($attribs as $key => $value) {
+            if ('_' == substr($key, 0, 1)) {
+                unset($attribs[$key]);
+            }
+        }
+
+        return $attribs;
+    }
+
+    /**
+     * Overloading: retrieve object property
+     *
+     * Prevents access to properties beginning with '_'.
+     *
+     * @param  string $key
+     * @return mixed
+     */
+    public function __get($key)
+    {
+        if ('_' == $key[0]) {
+            require_once 'Zend/Form/Exception.php';
+            throw new Zend_Form_Exception(sprintf('Cannot retrieve value for protected/private property "%s"', $key));
+        }
+
+        if (!isset($this->$key)) {
+            return null;
+        }
+
+        return $this->$key;
+    }
+
+    /**
+     * Overloading: set object property
+     *
+     * @param  string $key
+     * @param  mixed $value
+     * @return voide
+     */
+    public function __set($key, $value)
+    {
+        $this->setAttrib($key, $value);
+    }
+
+    /**
+     * Overloading: allow rendering specific decorators
+     *
+     * Call renderDecoratorName() to render a specific decorator.
+     *
+     * @param  string $method
+     * @param  array $args
+     * @return string
+     * @throws Zend_Form_Exception for invalid decorator or invalid method call
+     */
+    public function __call($method, $args)
+    {
+        if ('render' == substr($method, 0, 6)) {
+            $this->_isPartialRendering = true;
+            $this->render();
+            $this->_isPartialRendering = false;
+            $decoratorName = substr($method, 6);
+            if (false !== ($decorator = $this->getDecorator($decoratorName))) {
+                $decorator->setElement($this);
+                $seed = '';
+                if (0 < count($args)) {
+                    $seed = array_shift($args);
+                }
+                return $decorator->render($seed);
+            }
+
+            require_once 'Zend/Form/Element/Exception.php';
+            throw new Zend_Form_Element_Exception(sprintf('Decorator by name %s does not exist', $decoratorName));
+        }
+
+        require_once 'Zend/Form/Element/Exception.php';
+        throw new Zend_Form_Element_Exception(sprintf('Method %s does not exist', $method));
+    }
+
+    // Loaders
+
+    /**
+     * Set plugin loader to use for validator or filter chain
+     *
+     * @param  Zend_Loader_PluginLoader_Interface $loader
+     * @param  string $type 'decorator', 'filter', or 'validate'
+     * @return Zend_Form_Element
+     * @throws Zend_Form_Exception on invalid type
+     */
+    public function setPluginLoader(Zend_Loader_PluginLoader_Interface $loader, $type)
+    {
+        $type = strtoupper($type);
+        switch ($type) {
+            case self::DECORATOR:
+            case self::FILTER:
+            case self::VALIDATE:
+                $this->_loaders[$type] = $loader;
+                return $this;
+            default:
+                require_once 'Zend/Form/Exception.php';
+                throw new Zend_Form_Exception(sprintf('Invalid type "%s" provided to setPluginLoader()', $type));
+        }
+    }
+
+    /**
+     * Retrieve plugin loader for validator or filter chain
+     *
+     * Instantiates with default rules if none available for that type. Use
+     * 'decorator', 'filter', or 'validate' for $type.
+     *
+     * @param  string $type
+     * @return Zend_Loader_PluginLoader
+     * @throws Zend_Loader_Exception on invalid type.
+     */
+    public function getPluginLoader($type)
+    {
+        $type = strtoupper($type);
+        switch ($type) {
+            case self::FILTER:
+            case self::VALIDATE:
+                $prefixSegment = ucfirst(strtolower($type));
+                $pathSegment   = $prefixSegment;
+            case self::DECORATOR:
+                if (!isset($prefixSegment)) {
+                    $prefixSegment = 'Form_Decorator';
+                    $pathSegment   = 'Form/Decorator';
+                }
+                if (!isset($this->_loaders[$type])) {
+                    require_once 'Zend/Loader/PluginLoader.php';
+                    $this->_loaders[$type] = new Zend_Loader_PluginLoader(
+                        array('Zend_' . $prefixSegment . '_' => 'Zend/' . $pathSegment . '/')
+                    );
+                }
+                return $this->_loaders[$type];
+            default:
+                require_once 'Zend/Form/Exception.php';
+                throw new Zend_Form_Exception(sprintf('Invalid type "%s" provided to getPluginLoader()', $type));
+        }
+    }
+
+    /**
+     * Add prefix path for plugin loader
+     *
+     * If no $type specified, assumes it is a base path for both filters and
+     * validators, and sets each according to the following rules:
+     * - decorators: $prefix = $prefix . '_Decorator'
+     * - filters: $prefix = $prefix . '_Filter'
+     * - validators: $prefix = $prefix . '_Validate'
+     *
+     * Otherwise, the path prefix is set on the appropriate plugin loader.
+     *
+     * @param  string $prefix
+     * @param  string $path
+     * @param  string $type
+     * @return Zend_Form_Element
+     * @throws Zend_Form_Exception for invalid type
+     */
+    public function addPrefixPath($prefix, $path, $type = null)
+    {
+        $type = strtoupper($type);
+        switch ($type) {
+            case self::DECORATOR:
+            case self::FILTER:
+            case self::VALIDATE:
+                $loader = $this->getPluginLoader($type);
+                $loader->addPrefixPath($prefix, $path);
+                return $this;
+            case null:
+                $prefix = rtrim($prefix, '_');
+                $path   = rtrim($path, DIRECTORY_SEPARATOR);
+                foreach (array(self::DECORATOR, self::FILTER, self::VALIDATE) as $type) {
+                    $cType        = ucfirst(strtolower($type));
+                    $pluginPath   = $path . DIRECTORY_SEPARATOR . $cType . DIRECTORY_SEPARATOR;
+                    $pluginPrefix = $prefix . '_' . $cType;
+                    $loader       = $this->getPluginLoader($type);
+                    $loader->addPrefixPath($pluginPrefix, $pluginPath);
+                }
+                return $this;
+            default:
+                require_once 'Zend/Form/Exception.php';
+                throw new Zend_Form_Exception(sprintf('Invalid type "%s" provided to getPluginLoader()', $type));
+        }
+    }
+
+    /**
+     * Add many prefix paths at once
+     *
+     * @param  array $spec
+     * @return Zend_Form_Element
+     */
+    public function addPrefixPaths(array $spec)
+    {
+        if (isset($spec['prefix']) && isset($spec['path'])) {
+            return $this->addPrefixPath($spec['prefix'], $spec['path']);
+        }
+        foreach ($spec as $type => $paths) {
+            if (is_numeric($type) && is_array($paths)) {
+                $type = null;
+                if (isset($paths['prefix']) && isset($paths['path'])) {
+                    if (isset($paths['type'])) {
+                        $type = $paths['type'];
+                    }
+                    $this->addPrefixPath($paths['prefix'], $paths['path'], $type);
+                }
+            } elseif (!is_numeric($type)) {
+                if (!isset($paths['prefix']) || !isset($paths['path'])) {
+                    foreach ($paths as $prefix => $spec) {
+                        if (is_array($spec)) {
+                            foreach ($spec as $path) {
+                                if (!is_string($path)) {
+                                    continue;
+                                }
+                                $this->addPrefixPath($prefix, $path, $type);
+                            }
+                        } elseif (is_string($spec)) {
+                            $this->addPrefixPath($prefix, $spec, $type);
+                        }
+                    }
+                } else {
+                    $this->addPrefixPath($paths['prefix'], $paths['path'], $type);
+                }
+            }
+        }
+        return $this;
+    }
+
+    // Validation
+
+    /**
+     * Add validator to validation chain
+     *
+     * Note: will overwrite existing validators if they are of the same class.
+     *
+     * @param  string|Zend_Validate_Interface $validator
+     * @param  bool $breakChainOnFailure
+     * @param  array $options
+     * @return Zend_Form_Element
+     * @throws Zend_Form_Exception if invalid validator type
+     */
+    public function addValidator($validator, $breakChainOnFailure = false, $options = array())
+    {
+        if ($validator instanceof Zend_Validate_Interface) {
+            $name = get_class($validator);
+
+            if (!isset($validator->zfBreakChainOnFailure)) {
+                $validator->zfBreakChainOnFailure = $breakChainOnFailure;
+            }
+        } elseif (is_string($validator)) {
+            $name      = $validator;
+            $validator = array(
+                'validator' => $validator,
+                'breakChainOnFailure' => $breakChainOnFailure,
+                'options'             => $options,
+            );
+        } else {
+            require_once 'Zend/Form/Exception.php';
+            throw new Zend_Form_Exception('Invalid validator provided to addValidator; must be string or Zend_Validate_Interface');
+        }
+
+
+        $this->_validators[$name] = $validator;
+
+        return $this;
+    }
+
+    /**
+     * Add multiple validators
+     *
+     * @param  array $validators
+     * @return Zend_Form_Element
+     */
+    public function addValidators(array $validators)
+    {
+        foreach ($validators as $validatorInfo) {
+            if (is_string($validatorInfo)) {
+                $this->addValidator($validatorInfo);
+            } elseif ($validatorInfo instanceof Zend_Validate_Interface) {
+                $this->addValidator($validatorInfo);
+            } elseif (is_array($validatorInfo)) {
+                $argc                = count($validatorInfo);
+                $breakChainOnFailure = false;
+                $options             = array();
+                if (isset($validatorInfo['validator'])) {
+                    $validator = $validatorInfo['validator'];
+                    if (isset($validatorInfo['breakChainOnFailure'])) {
+                        $breakChainOnFailure = $validatorInfo['breakChainOnFailure'];
+                    }
+                    if (isset($validatorInfo['options'])) {
+                        $options = $validatorInfo['options'];
+                    }
+                    $this->addValidator($validator, $breakChainOnFailure, $options);
+                } else {
+                    switch (true) {
+                        case (0 == $argc):
+                            break;
+                        case (1 <= $argc):
+                            $validator  = array_shift($validatorInfo);
+                        case (2 <= $argc):
+                            $breakChainOnFailure = array_shift($validatorInfo);
+                        case (3 <= $argc):
+                            $options = array_shift($validatorInfo);
+                        default:
+                            $this->addValidator($validator, $breakChainOnFailure, $options);
+                            break;
+                    }
+                }
+            } else {
+                require_once 'Zend/Form/Exception.php';
+                throw new Zend_Form_Exception('Invalid validator passed to addValidators()');
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Set multiple validators, overwriting previous validators
+     *
+     * @param  array $validators
+     * @return Zend_Form_Element
+     */
+    public function setValidators(array $validators)
+    {
+        $this->clearValidators();
+        return $this->addValidators($validators);
+    }
+
+    /**
+     * Retrieve a single validator by name
+     *
+     * @param  string $name
+     * @return Zend_Validate_Interface|false False if not found, validator otherwise
+     */
+    public function getValidator($name)
+    {
+        if (!isset($this->_validators[$name])) {
+            $len = strlen($name);
+            foreach ($this->_validators as $localName => $validator) {
+                if ($len > strlen($localName)) {
+                    continue;
+                }
+                if (0 === substr_compare($localName, $name, -$len, $len, true)) {
+                    if (is_array($validator)) {
+                        return $this->_loadValidator($validator);
+                    }
+                    return $validator;
+                }
+            }
+            return false;
+        }
+
+        if (is_array($this->_validators[$name])) {
+            return $this->_loadValidator($this->_validators[$name]);
+        }
+
+        return $this->_validators[$name];
+    }
+
+    /**
+     * Retrieve all validators
+     *
+     * @return array
+     */
+    public function getValidators()
+    {
+        $validators = array();
+        foreach ($this->_validators as $key => $value) {
+            if ($value instanceof Zend_Validate_Interface) {
+                $validators[$key] = $value;
+                continue;
+            }
+            $validator = $this->_loadValidator($value);
+            $validators[get_class($validator)] = $validator;
+        }
+        return $validators;
+    }
+
+    /**
+     * Remove a single validator by name
+     *
+     * @param  string $name
+     * @return bool
+     */
+    public function removeValidator($name)
+    {
+        if (isset($this->_validators[$name])) {
+            unset($this->_validators[$name]);
+        } else {
+            $len = strlen($name);
+            foreach (array_keys($this->_validators) as $validator) {
+                if ($len > strlen($validator)) {
+                    continue;
+                }
+                if (0 === substr_compare($validator, $name, -$len, $len, true)) {
+                    unset($this->_validators[$validator]);
+                    break;
+                }
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Clear all validators
+     *
+     * @return Zend_Form_Element
+     */
+    public function clearValidators()
+    {
+        $this->_validators = array();
+        return $this;
+    }
+
+    /**
+     * Validate element value
+     *
+     * If a translation adapter is registered, any error messages will be
+     * translated according to the current locale, using the given error code;
+     * if no matching translation is found, the original message will be
+     * utilized.
+     *
+     * Note: The *filtered* value is validated.
+     *
+     * @param  mixed $value
+     * @param  mixed $context
+     * @return boolean
+     */
+    public function isValid($value, $context = null)
+    {
+        $this->setValue($value);
+        $value = $this->getValue();
+
+        if ((('' === $value) || (null === $value))
+            && !$this->isRequired()
+            && $this->getAllowEmpty()
+        ) {
+            return true;
+        }
+
+        if ($this->isRequired()
+            && $this->autoInsertNotEmptyValidator()
+            && !$this->getValidator('NotEmpty'))
+        {
+            $validators = $this->getValidators();
+            $notEmpty   = array('validator' => 'NotEmpty', 'breakChainOnFailure' => true);
+            array_unshift($validators, $notEmpty);
+            $this->setValidators($validators);
+        }
+
+        // Find the correct translator. Zend_Validate_Abstract::getDefaultTranslator()
+        // will get either the static translator attached to Zend_Validate_Abstract
+        // or the 'Zend_Translate' from Zend_Registry.
+        if (Zend_Validate_Abstract::hasDefaultTranslator() &&
+            !Zend_Form::hasDefaultTranslator())
+        {
+            $translator = Zend_Validate_Abstract::getDefaultTranslator();
+            if ($this->hasTranslator()) {
+                // only pick up this element's translator if it was attached directly.
+                $translator = $this->getTranslator();
+            }
+        } else {
+            $translator = $this->getTranslator();
+        }
+
+        $this->_messages = array();
+        $this->_errors   = array();
+        $result          = true;
+        $isArray         = $this->isArray();
+        foreach ($this->getValidators() as $key => $validator) {
+            if (method_exists($validator, 'setTranslator')) {
+                if (method_exists($validator, 'hasTranslator')) {
+                    if (!$validator->hasTranslator()) {
+                        $validator->setTranslator($translator);
+                    }
+                } else {
+                    $validator->setTranslator($translator);
+                }
+            }
+
+            if (method_exists($validator, 'setDisableTranslator')) {
+                $validator->setDisableTranslator($this->translatorIsDisabled());
+            }
+
+            if ($isArray && is_array($value)) {
+                $messages = array();
+                $errors   = array();
+                foreach ($value as $val) {
+                    if (!$validator->isValid($val, $context)) {
+                        $result = false;
+                        if ($this->_hasErrorMessages()) {
+                            $messages = $this->_getErrorMessages();
+                            $errors   = $messages;
+                        } else {
+                            $messages = array_merge($messages, $validator->getMessages());
+                            $errors   = array_merge($errors,   $validator->getErrors());
+                        }
+                    }
+                }
+                if ($result) {
+                    continue;
+                }
+            } elseif ($validator->isValid($value, $context)) {
+                continue;
+            } else {
+                $result = false;
+                if ($this->_hasErrorMessages()) {
+                    $messages = $this->_getErrorMessages();
+                    $errors   = $messages;
+                } else {
+                    $messages = $validator->getMessages();
+                    $errors   = array_keys($messages);
+                }
+            }
+
+            $result          = false;
+            $this->_messages = array_merge($this->_messages, $messages);
+            $this->_errors   = array_merge($this->_errors,   $errors);
+
+            if ($validator->zfBreakChainOnFailure) {
+                break;
+            }
+        }
+
+        // If element manually flagged as invalid, return false
+        if ($this->_isErrorForced) {
+            return false;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Add a custom error message to return in the event of failed validation
+     *
+     * @param  string $message
+     * @return Zend_Form_Element
+     */
+    public function addErrorMessage($message)
+    {
+        $this->_errorMessages[] = (string) $message;
+        return $this;
+    }
+
+    /**
+     * Add multiple custom error messages to return in the event of failed validation
+     *
+     * @param  array $messages
+     * @return Zend_Form_Element
+     */
+    public function addErrorMessages(array $messages)
+    {
+        foreach ($messages as $message) {
+            $this->addErrorMessage($message);
+        }
+        return $this;
+    }
+
+    /**
+     * Same as addErrorMessages(), but clears custom error message stack first
+     *
+     * @param  array $messages
+     * @return Zend_Form_Element
+     */
+    public function setErrorMessages(array $messages)
+    {
+        $this->clearErrorMessages();
+        return $this->addErrorMessages($messages);
+    }
+
+    /**
+     * Retrieve custom error messages
+     *
+     * @return array
+     */
+    public function getErrorMessages()
+    {
+        return $this->_errorMessages;
+    }
+
+    /**
+     * Clear custom error messages stack
+     *
+     * @return Zend_Form_Element
+     */
+    public function clearErrorMessages()
+    {
+        $this->_errorMessages = array();
+        return $this;
+    }
+
+    /**
+     * Get errorMessageSeparator
+     *
+     * @return string
+     */
+    public function getErrorMessageSeparator()
+    {
+        return $this->_errorMessageSeparator;
+    }
+
+    /**
+     * Set errorMessageSeparator
+     *
+     * @param  string $separator
+     * @return Zend_Form_Element
+     */
+    public function setErrorMessageSeparator($separator)
+    {
+        $this->_errorMessageSeparator = $separator;
+        return $this;
+    }
+
+    /**
+     * Mark the element as being in a failed validation state
+     *
+     * @return Zend_Form_Element
+     */
+    public function markAsError()
+    {
+        $messages       = $this->getMessages();
+        $customMessages = $this->_getErrorMessages();
+        $messages       = $messages + $customMessages;
+        if (empty($messages)) {
+            $this->_isError = true;
+        } else {
+            $this->_messages = $messages;
+        }
+        $this->_isErrorForced = true;
+        return $this;
+    }
+
+    /**
+     * Add an error message and mark element as failed validation
+     *
+     * @param  string $message
+     * @return Zend_Form_Element
+     */
+    public function addError($message)
+    {
+        $this->addErrorMessage($message);
+        $this->markAsError();
+        return $this;
+    }
+
+    /**
+     * Add multiple error messages and flag element as failed validation
+     *
+     * @param  array $messages
+     * @return Zend_Form_Element
+     */
+    public function addErrors(array $messages)
+    {
+        foreach ($messages as $message) {
+            $this->addError($message);
+        }
+        return $this;
+    }
+
+    /**
+     * Overwrite any previously set error messages and flag as failed validation
+     *
+     * @param  array $messages
+     * @return Zend_Form_Element
+     */
+    public function setErrors(array $messages)
+    {
+        $this->clearErrorMessages();
+        return $this->addErrors($messages);
+    }
+
+    /**
+     * Are there errors registered?
+     *
+     * @return bool
+     */
+    public function hasErrors()
+    {
+        return (!empty($this->_messages) || $this->_isError);
+    }
+
+    /**
+     * Retrieve validator chain errors
+     *
+     * @return array
+     */
+    public function getErrors()
+    {
+        return $this->_errors;
+    }
+
+    /**
+     * Retrieve error messages
+     *
+     * @return array
+     */
+    public function getMessages()
+    {
+        return $this->_messages;
+    }
+
+
+    // Filtering
+
+    /**
+     * Add a filter to the element
+     *
+     * @param  string|Zend_Filter_Interface $filter
+     * @return Zend_Form_Element
+     */
+    public function addFilter($filter, $options = array())
+    {
+        if ($filter instanceof Zend_Filter_Interface) {
+            $name = get_class($filter);
+        } elseif (is_string($filter)) {
+            $name = $filter;
+            $filter = array(
+                'filter'  => $filter,
+                'options' => $options,
+            );
+            $this->_filters[$name] = $filter;
+        } else {
+            require_once 'Zend/Form/Exception.php';
+            throw new Zend_Form_Exception('Invalid filter provided to addFilter; must be string or Zend_Filter_Interface');
+        }
+
+        $this->_filters[$name] = $filter;
+
+        return $this;
+    }
+
+    /**
+     * Add filters to element
+     *
+     * @param  array $filters
+     * @return Zend_Form_Element
+     */
+    public function addFilters(array $filters)
+    {
+        foreach ($filters as $filterInfo) {
+            if (is_string($filterInfo)) {
+                $this->addFilter($filterInfo);
+            } elseif ($filterInfo instanceof Zend_Filter_Interface) {
+                $this->addFilter($filterInfo);
+            } elseif (is_array($filterInfo)) {
+                $argc                = count($filterInfo);
+                $options             = array();
+                if (isset($filterInfo['filter'])) {
+                    $filter = $filterInfo['filter'];
+                    if (isset($filterInfo['options'])) {
+                        $options = $filterInfo['options'];
+                    }
+                    $this->addFilter($filter, $options);
+                } else {
+                    switch (true) {
+                        case (0 == $argc):
+                            break;
+                        case (1 <= $argc):
+                            $filter  = array_shift($filterInfo);
+                        case (2 <= $argc):
+                            $options = array_shift($filterInfo);
+                        default:
+                            $this->addFilter($filter, $options);
+                            break;
+                    }
+                }
+            } else {
+                require_once 'Zend/Form/Exception.php';
+                throw new Zend_Form_Exception('Invalid filter passed to addFilters()');
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Add filters to element, overwriting any already existing
+     *
+     * @param  array $filters
+     * @return Zend_Form_Element
+     */
+    public function setFilters(array $filters)
+    {
+        $this->clearFilters();
+        return $this->addFilters($filters);
+    }
+
+    /**
+     * Retrieve a single filter by name
+     *
+     * @param  string $name
+     * @return Zend_Filter_Interface
+     */
+    public function getFilter($name)
+    {
+        if (!isset($this->_filters[$name])) {
+            $len = strlen($name);
+            foreach ($this->_filters as $localName => $filter) {
+                if ($len > strlen($localName)) {
+                    continue;
+                }
+
+                if (0 === substr_compare($localName, $name, -$len, $len, true)) {
+                    if (is_array($filter)) {
+                        return $this->_loadFilter($filter);
+                    }
+                    return $filter;
+                }
+            }
+            return false;
+        }
+
+        if (is_array($this->_filters[$name])) {
+            return $this->_loadFilter($this->_filters[$name]);
+        }
+
+        return $this->_filters[$name];
+    }
+
+    /**
+     * Get all filters
+     *
+     * @return array
+     */
+    public function getFilters()
+    {
+        $filters = array();
+        foreach ($this->_filters as $key => $value) {
+            if ($value instanceof Zend_Filter_Interface) {
+                $filters[$key] = $value;
+                continue;
+            }
+            $filter = $this->_loadFilter($value);
+            $filters[get_class($filter)] = $filter;
+        }
+        return $filters;
+    }
+
+    /**
+     * Remove a filter by name
+     *
+     * @param  string $name
+     * @return Zend_Form_Element
+     */
+    public function removeFilter($name)
+    {
+        if (isset($this->_filters[$name])) {
+            unset($this->_filters[$name]);
+        } else {
+            $len = strlen($name);
+            foreach (array_keys($this->_filters) as $filter) {
+                if ($len > strlen($filter)) {
+                    continue;
+                }
+                if (0 === substr_compare($filter, $name, -$len, $len, true)) {
+                    unset($this->_filters[$filter]);
+                    break;
+                }
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Clear all filters
+     *
+     * @return Zend_Form_Element
+     */
+    public function clearFilters()
+    {
+        $this->_filters = array();
+        return $this;
+    }
+
+    // Rendering
+
+    /**
+     * Set view object
+     *
+     * @param  Zend_View_Interface $view
+     * @return Zend_Form_Element
+     */
+    public function setView(Zend_View_Interface $view = null)
+    {
+        $this->_view = $view;
+        return $this;
+    }
+
+    /**
+     * Retrieve view object
+     *
+     * Retrieves from ViewRenderer if none previously set.
+     *
+     * @return null|Zend_View_Interface
+     */
+    public function getView()
+    {
+        if (null === $this->_view) {
+            require_once 'Zend/Controller/Action/HelperBroker.php';
+            $viewRenderer = Zend_Controller_Action_HelperBroker::getStaticHelper('viewRenderer');
+            $this->setView($viewRenderer->view);
+        }
+        return $this->_view;
+    }
+
+    /**
+     * Instantiate a decorator based on class name or class name fragment
+     *
+     * @param  string $name
+     * @param  null|array $options
+     * @return Zend_Form_Decorator_Interface
+     */
+    protected function _getDecorator($name, $options)
+    {
+        $class = $this->getPluginLoader(self::DECORATOR)->load($name);
+        if (null === $options) {
+            $decorator = new $class;
+        } else {
+            $decorator = new $class($options);
+        }
+
+        return $decorator;
+    }
+
+    /**
+     * Add a decorator for rendering the element
+     *
+     * @param  string|Zend_Form_Decorator_Interface $decorator
+     * @param  array|Zend_Config $options Options with which to initialize decorator
+     * @return Zend_Form_Element
+     */
+    public function addDecorator($decorator, $options = null)
+    {
+        if ($decorator instanceof Zend_Form_Decorator_Interface) {
+            $name = get_class($decorator);
+        } elseif (is_string($decorator)) {
+            $name      = $decorator;
+            $decorator = array(
+                'decorator' => $name,
+                'options'   => $options,
+            );
+        } elseif (is_array($decorator)) {
+            foreach ($decorator as $name => $spec) {
+                break;
+            }
+            if (is_numeric($name)) {
+                require_once 'Zend/Form/Exception.php';
+                throw new Zend_Form_Exception('Invalid alias provided to addDecorator; must be alphanumeric string');
+            }
+            if (is_string($spec)) {
+                $decorator = array(
+                    'decorator' => $spec,
+                    'options'   => $options,
+                );
+            } elseif ($spec instanceof Zend_Form_Decorator_Interface) {
+                $decorator = $spec;
+            }
+        } else {
+            require_once 'Zend/Form/Exception.php';
+            throw new Zend_Form_Exception('Invalid decorator provided to addDecorator; must be string or Zend_Form_Decorator_Interface');
+        }
+
+        $this->_decorators[$name] = $decorator;
+
+        return $this;
+    }
+
+    /**
+     * Add many decorators at once
+     *
+     * @param  array $decorators
+     * @return Zend_Form_Element
+     */
+    public function addDecorators(array $decorators)
+    {
+        foreach ($decorators as $decoratorName => $decoratorInfo) {
+            if (is_string($decoratorInfo) ||
+                $decoratorInfo instanceof Zend_Form_Decorator_Interface) {
+                if (!is_numeric($decoratorName)) {
+                    $this->addDecorator(array($decoratorName => $decoratorInfo));
+                } else {
+                    $this->addDecorator($decoratorInfo);
+                }
+            } elseif (is_array($decoratorInfo)) {
+                $argc    = count($decoratorInfo);
+                $options = array();
+                if (isset($decoratorInfo['decorator'])) {
+                    $decorator = $decoratorInfo['decorator'];
+                    if (isset($decoratorInfo['options'])) {
+                        $options = $decoratorInfo['options'];
+                    }
+                    $this->addDecorator($decorator, $options);
+                } else {
+                    switch (true) {
+                        case (0 == $argc):
+                            break;
+                        case (1 <= $argc):
+                            $decorator  = array_shift($decoratorInfo);
+                        case (2 <= $argc):
+                            $options = array_shift($decoratorInfo);
+                        default:
+                            $this->addDecorator($decorator, $options);
+                            break;
+                    }
+                }
+            } else {
+                require_once 'Zend/Form/Exception.php';
+                throw new Zend_Form_Exception('Invalid decorator passed to addDecorators()');
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Overwrite all decorators
+     *
+     * @param  array $decorators
+     * @return Zend_Form_Element
+     */
+    public function setDecorators(array $decorators)
+    {
+        $this->clearDecorators();
+        return $this->addDecorators($decorators);
+    }
+
+    /**
+     * Retrieve a registered decorator
+     *
+     * @param  string $name
+     * @return false|Zend_Form_Decorator_Abstract
+     */
+    public function getDecorator($name)
+    {
+        if (!isset($this->_decorators[$name])) {
+            $len = strlen($name);
+            foreach ($this->_decorators as $localName => $decorator) {
+                if ($len > strlen($localName)) {
+                    continue;
+                }
+
+                if (0 === substr_compare($localName, $name, -$len, $len, true)) {
+                    if (is_array($decorator)) {
+                        return $this->_loadDecorator($decorator, $localName);
+                    }
+                    return $decorator;
+                }
+            }
+            return false;
+        }
+
+        if (is_array($this->_decorators[$name])) {
+            return $this->_loadDecorator($this->_decorators[$name], $name);
+        }
+
+        return $this->_decorators[$name];
+    }
+
+    /**
+     * Retrieve all decorators
+     *
+     * @return array
+     */
+    public function getDecorators()
+    {
+        foreach ($this->_decorators as $key => $value) {
+            if (is_array($value)) {
+                $this->_loadDecorator($value, $key);
+            }
+        }
+        return $this->_decorators;
+    }
+
+    /**
+     * Remove a single decorator
+     *
+     * @param  string $name
+     * @return Zend_Form_Element
+     */
+    public function removeDecorator($name)
+    {
+        if (isset($this->_decorators[$name])) {
+            unset($this->_decorators[$name]);
+        } else {
+            $len = strlen($name);
+            foreach (array_keys($this->_decorators) as $decorator) {
+                if ($len > strlen($decorator)) {
+                    continue;
+                }
+                if (0 === substr_compare($decorator, $name, -$len, $len, true)) {
+                    unset($this->_decorators[$decorator]);
+                    break;
+                }
+            }
+        }
+
+        return $this;
+    }
+
+    /**
+     * Clear all decorators
+     *
+     * @return Zend_Form_Element
+     */
+    public function clearDecorators()
+    {
+        $this->_decorators = array();
+        return $this;
+    }
+
+    /**
+     * Render form element
+     *
+     * @param  Zend_View_Interface $view
+     * @return string
+     */
+    public function render(Zend_View_Interface $view = null)
+    {
+        if ($this->_isPartialRendering) {
+            return '';
+        }
+
+        if (null !== $view) {
+            $this->setView($view);
+        }
+
+        $content = '';
+        foreach ($this->getDecorators() as $decorator) {
+            $decorator->setElement($this);
+            $content = $decorator->render($content);
+        }
+        return $content;
+    }
+
+    /**
+     * String representation of form element
+     *
+     * Proxies to {@link render()}.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        try {
+            $return = $this->render();
+            return $return;
+        } catch (Exception $e) {
+            trigger_error($e->getMessage(), E_USER_WARNING);
+            return '';
+        }
+    }
+
+    /**
+     * Lazy-load a filter
+     *
+     * @param  array $filter
+     * @return Zend_Filter_Interface
+     */
+    protected function _loadFilter(array $filter)
+    {
+        $origName = $filter['filter'];
+        $name     = $this->getPluginLoader(self::FILTER)->load($filter['filter']);
+
+        if (array_key_exists($name, $this->_filters)) {
+            require_once 'Zend/Form/Exception.php';
+            throw new Zend_Form_Exception(sprintf('Filter instance already exists for filter "%s"', $origName));
+        }
+
+        if (empty($filter['options'])) {
+            $instance = new $name;
+        } else {
+            $r = new ReflectionClass($name);
+            if ($r->hasMethod('__construct')) {
+                $instance = $r->newInstanceArgs((array) $filter['options']);
+            } else {
+                $instance = $r->newInstance();
+            }
+        }
+
+        if ($origName != $name) {
+            $filterNames  = array_keys($this->_filters);
+            $order        = array_flip($filterNames);
+            $order[$name] = $order[$origName];
+            $filtersExchange = array();
+            unset($order[$origName]);
+            asort($order);
+            foreach ($order as $key => $index) {
+                if ($key == $name) {
+                    $filtersExchange[$key] = $instance;
+                    continue;
+                }
+                $filtersExchange[$key] = $this->_filters[$key];
+            }
+            $this->_filters = $filtersExchange;
+        } else {
+            $this->_filters[$name] = $instance;
+        }
+
+        return $instance;
+    }
+
+    /**
+     * Lazy-load a validator
+     *
+     * @param  array $validator Validator definition
+     * @return Zend_Validate_Interface
+     */
+    protected function _loadValidator(array $validator)
+    {
+        $origName = $validator['validator'];
+        $name     = $this->getPluginLoader(self::VALIDATE)->load($validator['validator']);
+
+        if (array_key_exists($name, $this->_validators)) {
+            require_once 'Zend/Form/Exception.php';
+            throw new Zend_Form_Exception(sprintf('Validator instance already exists for validator "%s"', $origName));
+        }
+
+        $messages = false;
+        if (isset($validator['options']) && array_key_exists('messages', (array)$validator['options'])) {
+            $messages = $validator['options']['messages'];
+            unset($validator['options']['messages']);
+        }
+
+        if (empty($validator['options'])) {
+            $instance = new $name;
+        } else {
+            $r = new ReflectionClass($name);
+            if ($r->hasMethod('__construct')) {
+                $numeric = false;
+                if (is_array($validator['options'])) {
+                    $keys    = array_keys($validator['options']);
+                    foreach($keys as $key) {
+                        if (is_numeric($key)) {
+                            $numeric = true;
+                            break;
+                        }
+                    }
+                }
+
+                if ($numeric) {
+                    $instance = $r->newInstanceArgs((array) $validator['options']);
+                } else {
+                    $instance = $r->newInstance($validator['options']);
+                }
+            } else {
+                $instance = $r->newInstance();
+            }
+        }
+
+        if ($messages) {
+            if (is_array($messages)) {
+                $instance->setMessages($messages);
+            } elseif (is_string($messages)) {
+                $instance->setMessage($messages);
+            }
+        }
+        $instance->zfBreakChainOnFailure = $validator['breakChainOnFailure'];
+
+        if ($origName != $name) {
+            $validatorNames     = array_keys($this->_validators);
+            $order              = array_flip($validatorNames);
+            $order[$name]       = $order[$origName];
+            $validatorsExchange = array();
+            unset($order[$origName]);
+            asort($order);
+            foreach ($order as $key => $index) {
+                if ($key == $name) {
+                    $validatorsExchange[$key] = $instance;
+                    continue;
+                }
+                $validatorsExchange[$key] = $this->_validators[$key];
+            }
+            $this->_validators = $validatorsExchange;
+        } else {
+            $this->_validators[$name] = $instance;
+        }
+
+        return $instance;
+    }
+
+    /**
+     * Lazy-load a decorator
+     *
+     * @param  array $decorator Decorator type and options
+     * @param  mixed $name Decorator name or alias
+     * @return Zend_Form_Decorator_Interface
+     */
+    protected function _loadDecorator(array $decorator, $name)
+    {
+        $sameName = false;
+        if ($name == $decorator['decorator']) {
+            $sameName = true;
+        }
+
+        $instance = $this->_getDecorator($decorator['decorator'], $decorator['options']);
+        if ($sameName) {
+            $newName            = get_class($instance);
+            $decoratorNames     = array_keys($this->_decorators);
+            $order              = array_flip($decoratorNames);
+            $order[$newName]    = $order[$name];
+            $decoratorsExchange = array();
+            unset($order[$name]);
+            asort($order);
+            foreach ($order as $key => $index) {
+                if ($key == $newName) {
+                    $decoratorsExchange[$key] = $instance;
+                    continue;
+                }
+                $decoratorsExchange[$key] = $this->_decorators[$key];
+            }
+            $this->_decorators = $decoratorsExchange;
+        } else {
+            $this->_decorators[$name] = $instance;
+        }
+
+        return $instance;
+    }
+
+    /**
+     * Retrieve error messages and perform translation and value substitution
+     *
+     * @return array
+     */
+    protected function _getErrorMessages()
+    {
+        $translator = $this->getTranslator();
+        $messages   = $this->getErrorMessages();
+        $value      = $this->getValue();
+        foreach ($messages as $key => $message) {
+            if (null !== $translator) {
+                $message = $translator->translate($message);
+            }
+            if (($this->isArray() || is_array($value))
+                && !empty($value)
+            ) {
+                $aggregateMessages = array();
+                foreach ($value as $val) {
+                    $aggregateMessages[] = str_replace('%value%', $val, $message);
+                }
+                $messages[$key] = implode($this->getErrorMessageSeparator(), $aggregateMessages);
+            } else {
+                $messages[$key] = str_replace('%value%', $value, $message);
+            }
+        }
+        return $messages;
+    }
+
+    /**
+     * Are there custom error messages registered?
+     *
+     * @return bool
+     */
+    protected function _hasErrorMessages()
+    {
+        return !empty($this->_errorMessages);
+    }
+}