--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/enmi/Zend/Cloud/DocumentService/Adapter/SimpleDb/Query.php	Thu Jan 20 19:30:54 2011 +0100
@@ -0,0 +1,175 @@
+<?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
+ */
+
+/*
+ * @see Zend_Cloud_DocumentService_Query
+ */
+require_once 'Zend/Cloud/DocumentService/Query.php';
+
+/**
+ * Class implementing Query adapter for working with SimpleDb queries in a 
+ * structured way
+ *
+ * @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_Adapter_SimpleDb_Query
+    extends Zend_Cloud_DocumentService_Query
+{
+    /**
+     * @var Zend_Cloud_DocumentService_Adapter_SimpleDb
+     */
+    protected $_adapter;
+
+    /**
+     * Constructor
+     * 
+     * @param  Zend_Cloud_DocumentService_Adapter_SimpleDb $adapter 
+     * @param  null|string $collectionName
+     * @return void
+     */
+    public function __construct(Zend_Cloud_DocumentService_Adapter_SimpleDb $adapter, $collectionName = null)
+    {
+        $this->_adapter = $adapter;
+        if (null !== $collectionName) {
+            $this->from($collectionName);
+        }
+    }
+
+    /**
+     * Get adapter
+     * 
+     * @return Zend_Cloud_DocumentService_Adapter_SimpleDb
+     */
+    public function getAdapter()
+    {
+        return $this->_adapter;
+    }
+
+    /**
+     * Assemble the query into a format the adapter can utilize
+     * 
+     * @var    string $collectionName Name of collection from which to select
+     * @return string
+     */
+    public function assemble($collectionName = null)
+    {
+        $adapter = $this->getAdapter()->getClient();
+        $select  = null;
+        $from    = null;
+        $where   = null;
+        $order   = null;
+        $limit   = null;
+        foreach ($this->getClauses() as $clause) {
+            list($name, $args) = $clause;
+
+            switch ($name) {
+                case self::QUERY_SELECT:
+                    $select = $args[0];
+                    break;
+                case self::QUERY_FROM:
+                    if (null === $from) {
+                        // Only allow setting FROM clause once
+                        $from = $adapter->quoteName($args);
+                    }
+                    break;
+                case self::QUERY_WHERE:
+                    $statement = $this->_parseWhere($args[0], $args[1]);
+                    if (null === $where) {
+                        $where = $statement;
+                    } else {
+                        $operator = empty($args[2]) ? 'AND' : $args[2];
+                        $where .= ' ' . $operator . ' ' . $statement;
+                    }
+                    break;
+                case self::QUERY_WHEREID:
+                    $statement = $this->_parseWhere('ItemName() = ?', array($args));
+                    if (null === $where) {
+                        $where = $statement;
+                    } else {
+                        $operator = empty($args[2]) ? 'AND' : $args[2];
+                        $where .= ' ' . $operator . ' ' . $statement;
+                    }
+                    break;
+                case self::QUERY_ORDER:
+                    $order = $adapter->quoteName($args[0]);
+                    if (isset($args[1])) {
+                        $order .= ' ' . $args[1];
+                    }
+                    break;
+                case self::QUERY_LIMIT:
+                    $limit = $args;
+                    break;
+                default:
+                    // Ignore unknown clauses
+                    break;
+            }
+        }
+
+        if (empty($select)) {
+            $select = "*";
+        }
+        if (empty($from)) {
+            if (null === $collectionName) {
+                require_once 'Zend/Cloud/DocumentService/Exception.php';
+                throw new Zend_Cloud_DocumentService_Exception("Query requires a FROM clause");
+            }
+            $from = $adapter->quoteName($collectionName);
+        }
+        $query = "select $select from $from";
+        if (!empty($where)) {
+            $query .= " where $where";
+        }
+        if (!empty($order)) {
+            $query .= " order by $order";
+        }
+        if (!empty($limit)) {
+            $query .= " limit $limit";
+        }
+        return $query;
+    }
+
+    /**
+     * Parse a where statement into service-specific language
+     * 
+     * @todo   Ensure this fulfills the entire SimpleDB query specification for WHERE
+     * @param  string $where 
+     * @param  array $args 
+     * @return string
+     */
+    protected function _parseWhere($where, $args)
+    {
+        if (!is_array($args)) {
+            $args = (array) $args;
+        }
+        $adapter = $this->getAdapter()->getClient();
+        $i = 0;
+        while (false !== ($pos = strpos($where, '?'))) {
+           $where = substr_replace($where, $adapter->quote($args[$i]), $pos);
+           ++$i;
+        }
+        if (('(' != $where[0]) || (')' != $where[strlen($where) - 1])) {
+            $where = '(' . $where . ')';
+        }
+        return $where;
+    }
+ }