--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/Zend/Cloud/DocumentService/Query.php	Mon Dec 13 18:29:26 2010 +0100
@@ -0,0 +1,191 @@
+<?php
+/**
+ * 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_Cloud
+ * @subpackage DocumentService
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+
+require_once 'Zend/Cloud/DocumentService/QueryAdapter.php';
+
+/**
+ * Generic query object
+ *
+ * Aggregates operations in an array of clauses, where the first element 
+ * describes the clause type, and the next element describes the criteria.
+ *
+ * @category   Zend
+ * @package    Zend_Cloud
+ * @subpackage DocumentService
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Cloud_DocumentService_Query
+    implements Zend_Cloud_DocumentService_QueryAdapter
+{
+    /**
+     * Known query types
+     */
+    const QUERY_SELECT  = 'select';
+    const QUERY_FROM    = 'from';
+    const QUERY_WHERE   = 'where';
+    const QUERY_WHEREID = 'whereid'; // request element by ID
+    const QUERY_LIMIT   = 'limit';
+    const QUERY_ORDER   = 'order';
+
+    /**
+     * Clause list
+     * 
+     * @var array
+     */
+    protected $_clauses = array();
+
+    /**
+     * Generic clause
+     * 
+     * You can use any clause by doing $query->foo('bar')
+     * but concrete adapters should be able to recognise it
+     * 
+     * The call will be iterpreted as clause 'foo' with argument 'bar' 
+     * 
+     * @param  string $name Clause/method name
+     * @param  mixed $args
+     * @return Zend_Cloud_DocumentService_Query
+     */
+    public function __call($name, $args) 
+    {
+        $this->_clauses[] = array(strtolower($name), $args);
+        return $this;
+    }
+
+    /**
+     * SELECT clause (fields to be selected)
+     * 
+     * @param  null|string|array $select 
+     * @return Zend_Cloud_DocumentService_Query
+     */
+    public function select($select)
+    {
+        if (empty($select)) {
+            return $this;
+        }
+        if (!is_string($select) && !is_array($select)) {
+            require_once 'Zend/Cloud/DocumentService/Exception.php';           
+            throw new Zend_Cloud_DocumentService_Exception("SELECT argument must be a string or an array of strings");
+        }
+        $this->_clauses[] = array(self::QUERY_SELECT, $select);
+        return $this;
+    }
+    
+    /**
+     * FROM clause
+     * 
+     * @param string $name Field names  
+     * @return Zend_Cloud_DocumentService_Query
+     */
+    public function from($name)
+    {
+        if(!is_string($name)) {
+            require_once 'Zend/Cloud/DocumentService/Exception.php';           
+            throw new Zend_Cloud_DocumentService_Exception("FROM argument must be a string");
+        }
+        $this->_clauses[] = array(self::QUERY_FROM, $name);
+        return $this;
+    }
+    
+    /**
+     * WHERE query
+     * 
+     * @param string $cond Condition
+     * @param array $args Arguments to substitute instead of ?'s in condition
+     * @param string $op relation to other clauses - and/or
+     * @return Zend_Cloud_DocumentService_Query
+     */
+    public function where($cond, $value = null, $op = 'and')
+    {
+        if (!is_string($cond)) {
+            require_once 'Zend/Cloud/DocumentService/Exception.php';           
+            throw new Zend_Cloud_DocumentService_Exception("WHERE argument must be a string");
+        }
+        $this->_clauses[] = array(self::QUERY_WHERE, array($cond, $value, $op));
+        return $this;
+    }
+
+    /**
+     * Select record or fields by ID
+     * 
+     * @param  string|int $value Identifier to select by
+     * @return Zend_Cloud_DocumentService_Query
+     */
+    public function whereId($value)
+    {
+        if (!is_scalar($value)) {
+            require_once 'Zend/Cloud/DocumentService/Exception.php';           
+            throw new Zend_Cloud_DocumentService_Exception("WHEREID argument must be a scalar");
+        }
+        $this->_clauses[] = array(self::QUERY_WHEREID, $value);
+        return $this;
+    }
+
+    /**
+     * LIMIT clause (how many items to return)
+     * 
+     * @param  int $limit 
+     * @return Zend_Cloud_DocumentService_Query
+     */
+    public function limit($limit)
+    {
+        if ($limit != (int) $limit) {
+            require_once 'Zend/Cloud/DocumentService/Exception.php';           
+            throw new Zend_Cloud_DocumentService_Exception("LIMIT argument must be an integer");
+        }
+        $this->_clauses[] = array(self::QUERY_LIMIT, $limit);
+        return $this;
+    }
+
+    /**
+     * ORDER clause; field or fields to sort by, and direction to sort
+     * 
+     * @param  string|int|array $sort 
+     * @param  string $direction 
+     * @return Zend_Cloud_DocumentService_Query
+     */
+    public function order($sort, $direction = 'asc')
+    {
+        $this->_clauses[] = array(self::QUERY_ORDER, array($sort, $direction));
+        return $this;
+    }
+
+    /**
+     * "Assemble" the query
+     *
+     * Simply returns the clauses present.
+     * 
+     * @return array
+     */
+    public function assemble()
+    {
+        return $this->getClauses();
+    }
+    
+    /**
+     * Return query clauses as an array
+     * 
+     * @return array Clauses in the query
+     */
+    public function getClauses()
+    {
+         return $this->_clauses;   
+    }
+}