Updated code comments for PHPDocumentor - column classes

git-svn-id: http://xe-core.googlecode.com/svn/branches/luminous@12418 201d5d3c-b55e-5fd7-737f-ddc643e51545

classes/xml/XmlQueryParser.150.class.php

@@ -44,6 +44,7 @@ if(!defined('__XE_LOADED_XML_CLASS__')){
  *
  * @author Corina Udrescu (corina.udrescu@arnia.ro)
  * @package /classes/xml
+ * @version 0.1
  */
 class XmlQueryParser extends XmlParser {
 

classes/xml/xmlquery/DBParser.class.php

@@ -9,6 +9,7 @@
  *
  * @author Corina Udrescu (corina.udrescu@arnia.ro)
  * @package /classes/xml/xmlquery
+ * @version 0.1
  */
 class DBParser
 {

classes/xml/xmlquery/QueryParser.class.php

@@ -8,6 +8,7 @@
  *
  * @author Corina Udrescu (corina.udrescu@arnia.ro)
  * @package /classes/xml/xmlquery
+ * @version 0.1
  */
 class QueryParser {
 

classes/xml/xmlquery/tags/column/ColumnTag.class.php

@@ -1,28 +1,30 @@
 <?php
+/**
+ * ColumnTag class
+ * Models the <column> tag inside an XML Query file
+ * Since the <column> tag supports different attributes depending on
+ * the type of query (select, update, insert, delete) this is only
+ * the base class for the classes that will model each type <column> tag.
+ *
+ * @author Corina Udrescu (corina.udrescu@arnia.ro)
+ * @package /classes/xml/xmlquery/tags/column
+ * @version 0.1
+ */
+class ColumnTag
+{
 	/**
-	 * ColumnTag class
-	 * Models the <column> tag inside an XML Query file
-	 * Since the <column> tag supports different attributes depending on
-	 * the type of query (select, update, insert, delete) this is only
-	 * the base class for the classes that will model each type <column> tag. 
-	 *
-	 * @author Arnia Software
-	 * @package /classes/xml/xmlquery/tags/column
-	 * @version 0.1
+	 * Column name
+	 * @var string
 	 */
-	class ColumnTag {
-		/**
-		 * Column name
-		 * @var string
-		 */
-		var $name;
-		
-		/**
-		 * constructor
-		 * @param string $name
-		 * @return void
-		 */
-		function ColumnTag($name){	
-			$this->name = $name;
-		}
+	var $name;
+
+	/**
+	 * Constructor
+	 * @param string $name
+	 * @return void
+	 */
+	function ColumnTag($name)
+	{
+		$this->name = $name;
 	}
+}

classes/xml/xmlquery/tags/column/InsertColumnTag.class.php

@@ -1,40 +1,53 @@
 <?php
+/**
+ * InsertColumnTag
+ * Models the <column> tag inside an XML Query file whose action is 'insert'
+ *
+ * @author Corina Udrescu (corina.udrescu@arnia.ro)
+ * @package /classes/xml/xmlquery/tags/column
+ * @version 0.1
+ */
+class InsertColumnTag extends ColumnTag
+{
 	/**
-	 * InsertColumnTag
-	 * Models the <column> tag inside an XML Query file whose action is 'insert'
-	 *
-	 * @author Arnia Software
-	 * @package /classes/xml/xmlquery/tags/column
-	 * @version 0.1
+	 * Argument
+	 * @var QueryArgument object
 	 */
-	class InsertColumnTag extends ColumnTag {
-		/**
-		 * argument
-		 * @var QueryArgument object
-		 */
-		var $argument;
-
-		/**
-		 * constructor
-		 * @param object $column
-		 * @return void
-		 */
-		function InsertColumnTag($column) {
-			parent::ColumnTag($column->attrs->name);
-			$dbParser = DB::getParser();
-			$this->name = $dbParser->parseColumnName($this->name);
-			$this->argument = new QueryArgument($column);
-		}
-
-		function getExpressionString(){
-			return sprintf('new InsertExpression(\'%s\', ${\'%s_argument\'})'
-						, $this->name
-						, $this->argument->argument_name);
-		}
-
-		function getArgument(){
-			return $this->argument;
-		}
+	var $argument;
 
+	/**
+	 * Constructor
+	 * @param object $column
+	 * @return void
+	 */
+	function InsertColumnTag($column) {
+		parent::ColumnTag($column->attrs->name);
+		$dbParser = DB::getParser();
+		$this->name = $dbParser->parseColumnName($this->name);
+		$this->argument = new QueryArgument($column);
 	}
+
+	/**
+	 * Returns the string to be output in the cache file
+	 * used for instantiating an InsertExpression when a
+	 * query is executed
+	 *
+	 * @return string
+	 */
+	function getExpressionString(){
+		return sprintf('new InsertExpression(\'%s\', ${\'%s_argument\'})'
+					, $this->name
+					, $this->argument->argument_name);
+	}
+
+	/**
+	 * Returns the QueryArgument object associated with this INSERT statement
+	 *
+	 * @return QueryArgument
+	 */
+	function getArgument(){
+		return $this->argument;
+	}
+
+}
 ?>

classes/xml/xmlquery/tags/column/InsertColumnTagWithoutArgument.class.php

@@ -1,31 +1,46 @@
 <?php
+/**
+ * InsertColumnTagWithoutArgument
+ * Models the <column> tag inside an XML Query file whose action is 'insert-select'
+ *
+ * @author Corina Udrescu (corina.udrescu@arnia.ro)
+ * @package /classes/xml/xmlquery/tags/column
+ * @version 0.1
+ */
+class InsertColumnTagWithoutArgument extends ColumnTag
+{
 	/**
-	 * InsertColumnTagWithoutArgument
-	 * Models the <column> tag inside an XML Query file whose action is 'insert-select'
+	 * Constructor
 	 *
-	 * @author Arnia Software
-	 * @package /classes/xml/xmlquery/tags/column
-	 * @version 0.1
+	 * @param object $column
+	 * @return void
 	 */
-	class InsertColumnTagWithoutArgument extends ColumnTag {
-		/**
-		 * constructor
-		 * @param object $column
-		 * @return void
-		 */
-		function InsertColumnTagWithoutArgument($column) {
-			parent::ColumnTag($column->attrs->name);
-			$dbParser = DB::getParser();
-			$this->name = $dbParser->parseColumnName($this->name);
-		}
-
-		function getExpressionString(){
-			return sprintf('new Expression(\'%s\')', $this->name);
-		}
-
-		function getArgument(){
-			return null;
-		}
-
+	function InsertColumnTagWithoutArgument($column)
+	{
+		parent::ColumnTag($column->attrs->name);
+		$dbParser = DB::getParser();
+		$this->name = $dbParser->parseColumnName($this->name);
 	}
+
+	/**
+	 * Returns the string to be output in the cache file
+	 *
+	 * @return string
+	 */
+	function getExpressionString()
+	{
+		return sprintf('new Expression(\'%s\')', $this->name);
+	}
+
+	/**
+	 * Returns the QueryArgument object associated with this INSERT statement
+	 *
+	 * @return null
+	 */
+	function getArgument()
+	{
+		return NULL;
+	}
+
+}
 ?>

classes/xml/xmlquery/tags/column/InsertColumnsTag.class.php

@@ -1,65 +1,68 @@
 <?php
+/**
+ * InsertColumnsTag class
+ * Models the <columns> tag inside an XML Query file whose action is 'insert'
+ *
+ * @author Corina Udrescu (corina.udrescu@arnia.ro)
+ * @package /classes/xml/xmlquery/tags/column
+ * @version 0.1
+ */
+class InsertColumnsTag{
 	/**
-	 * InsertColumnsTag class
-	 * Models the <column> tag inside an XML Query file whose action is 'insert'
-	 *
-	 * @author Arnia Software
-	 * @package /classes/xml/xmlquery/tags/column
-	 * @version 0.1
+	 * Column list
+	 * @var array value is InsertColumnTag object
 	 */
-	class InsertColumnsTag{
-		/**
-		 * Column list
-		 * @var array value is InsertColumnTag object
-		 */
-		var $columns;
+	var $columns;
 
-		/**
-		 * constructor
-		 * @param array|string $xml_columns
-		 * @return void
-		 */
-		function InsertColumnsTag($xml_columns) {
-			$this->columns = array();
+	/**
+	 * Constructor
+	 * @param array|string $xml_columns
+	 * @return void
+	 */
+	function InsertColumnsTag($xml_columns)
+	{
+		$this->columns = array();
 
-			if(!$xml_columns)
-				return;
+		if(!$xml_columns)
+			return;
 
-			if(!is_array($xml_columns)) $xml_columns = array($xml_columns);
+		if(!is_array($xml_columns)) $xml_columns = array($xml_columns);
 
-			foreach($xml_columns as $column){
-				if($column->name === 'query') $this->columns[] = new QueryTag($column, true);
-				else if(!isset($column->attrs->var) && !isset($column->attrs->default)) $this->columns[] = new InsertColumnTagWithoutArgument($column);
-				else $this->columns[] = new InsertColumnTag($column);
-			}
+		foreach($xml_columns as $column){
+			if($column->name === 'query') $this->columns[] = new QueryTag($column, true);
+			else if(!isset($column->attrs->var) && !isset($column->attrs->default)) $this->columns[] = new InsertColumnTagWithoutArgument($column);
+			else $this->columns[] = new InsertColumnTag($column);
 		}
-
-		/**
-		 * InsertColumnTag object to string
-		 * @return string
-		 */
-		function toString(){
-			$output_columns = 'array(' . PHP_EOL;
-			foreach($this->columns as $column){
-				$output_columns .= $column->getExpressionString() . PHP_EOL . ',';
-			}
-			$output_columns = substr($output_columns, 0, -1);
-			$output_columns .= ')';
-			return $output_columns;
-		}
-
-		/**
-		 * Return argument list
-		 * @return array
-		 */
-		function getArguments(){
-			$arguments = array();
-			foreach($this->columns as $column){
-				$arguments[] = $column->getArgument();
-			}
-			return $arguments;
-		}
-
 	}
 
+	/**
+	 * InsertColumnTag object to string
+	 * @return string
+	 */
+	function toString()
+	{
+		$output_columns = 'array(' . PHP_EOL;
+		foreach($this->columns as $column){
+			$output_columns .= $column->getExpressionString() . PHP_EOL . ',';
+		}
+		$output_columns = substr($output_columns, 0, -1);
+		$output_columns .= ')';
+		return $output_columns;
+	}
+
+	/**
+	 * Return argument list
+	 * @return array
+	 */
+	function getArguments()
+	{
+		$arguments = array();
+		foreach($this->columns as $column){
+			$arguments[] = $column->getArgument();
+		}
+		return $arguments;
+	}
+
+}
+
 ?>

classes/xml/xmlquery/tags/column/SelectColumnTag.class.php

@@ -1,53 +1,66 @@
 <?php
+/**
+ * SelectColumnTag
+ * Models the <column> tag inside an XML Query file whose action is 'select'
+ *
+ * @author Corina Udrescu (corina.udrescu@arnia.ro)
+ * @package /classes/xml/xmlquery/tags/column
+ * @version 0.1
+ */
+class SelectColumnTag extends ColumnTag
+{
 	/**
-	 * SelectColumnTag
-	 * Models the <column> tag inside an XML Query file whose action is 'select'
-	 *
-	 * @author Arnia Software
-	 * @package /classes/xml/xmlquery/tags/column
-	 * @version 0.1
+	 * Column alias
+	 * @var string
 	 */
-	class SelectColumnTag extends ColumnTag{
-		/**
-		 * alias
-		 * @var string
-		 */
-		var $alias;
-		/**
-		 * click count status
-		 * @var bool
-		 */
-		var $click_count;
-		
-		/**
-		 * constructor
-		 * @param string|object $column
-		 * @return void
-		 */
-		function SelectColumnTag($column){
-			if ($column == "*" || $column->attrs->name == '*')
-			{
-				parent::ColumnTag(NULL);
-				$this->name = "*";
-			}
-			else
-			{
-				parent::ColumnTag($column->attrs->name);
-				$dbParser = new DB(); $dbParser = &$dbParser->getParser();
-				$this->name = $dbParser->parseExpression($this->name);
-				
-				$this->alias = $column->attrs->alias;
-				$this->click_count = $column->attrs->click_count;
-			}
+	var $alias;
+
+	/**
+	 * Click count status
+	 * @var bool
+	 */
+	var $click_count;
+
+	/**
+	 * Constructor
+	 * @param string|object $column
+	 * @return void
+	 */
+	function SelectColumnTag($column)
+	{
+		if ($column == "*" || $column->attrs->name == '*')
+		{
+			parent::ColumnTag(NULL);
+			$this->name = "*";
 		}
-		
-		function getExpressionString(){
-			if($this->name == '*') return "new StarExpression()";
-			if($this->click_count)
-				return sprintf('new ClickCountExpression(\'%s\', %s, $args->%s)', $this->name, $this->alias ? '\'' . $this->alias . '\'' : "''",$this->click_count);
-			if(strpos($this->name, '$') === 0)
-				return sprintf('new SelectExpression($args->%s)', substr($this->name, 1));
-			$dbParser = DB::getParser();
-			return sprintf('new SelectExpression(\'%s\'%s)', $this->name, $this->alias ? ', \''.$dbParser->escape($this->alias) .'\'': '');	
+		else
+		{
+			parent::ColumnTag($column->attrs->name);
+			$dbParser = new DB(); $dbParser = &$dbParser->getParser();
+			$this->name = $dbParser->parseExpression($this->name);
+
+			$this->alias = $column->attrs->alias;
+			$this->click_count = $column->attrs->click_count;
 		}
 	}
+
+	/**
+	 * Returns the string to be output in the cache file
+	 *
+	 * A select column tag in an XML query can be used for:
+	 *   - a star expression: SELECT *
+	 *   - a click count expression: SELECT + UPDATE
+	 *   - any other select expression (column name, function call etc).
+	 *
+	 * @return string
+	 */
+	function getExpressionString(){
+		if($this->name == '*') return "new StarExpression()";
+		if($this->click_count)
+			return sprintf('new ClickCountExpression(\'%s\', %s, $args->%s)', $this->name, $this->alias ? '\'' . $this->alias . '\'' : "''",$this->click_count);
+		if(strpos($this->name, '$') === 0)
+			return sprintf('new SelectExpression($args->%s)', substr($this->name, 1));
+		$dbParser = DB::getParser();
+		return sprintf('new SelectExpression(\'%s\'%s)', $this->name, $this->alias ? ', \''.$dbParser->escape($this->alias) .'\'': '');
+	}
+}

classes/xml/xmlquery/tags/column/SelectColumnsTag.class.php

@@ -1,83 +1,92 @@
 <?php
+/**
+ * SelectColumnsTag class
+ * Models the <columns> tag inside an XML Query file whose action is 'select'
+ *
+ * @author Corina Udrescu (corina.udrescu@arnia.ro)
+ * @package /classes/xml/xmlquery/tags/column
+ * @version 0.1
+ */
+class SelectColumnsTag
+{
 	/**
-	 * SelectColumnTag class
-	 *
-	 * @author Arnia Software
-	 * @package /classes/xml/xmlquery/tags/column
-	 * @version 0.1
+	 * Column list
+	 * @var array value is SelectColumnTag object
 	 */
-	class SelectColumnsTag {
-		/**
-		 * Column list
-		 * @var array value is SelectColumnTag object
-		 */
-		var $columns;
+	var $columns;
 
-		/**
-		 * constructor
-		 * @param Xml_Node_ $xml_columns
-		 * @return void
-		 */
-		function SelectColumnsTag($xml_columns_tag){
-			if (!$xml_columns_tag)
-			    $xml_columns_tag = new Xml_Node_();
+	/**
+	 * Constructor
+	 *
+	 * @param $xml_columns_tag
+	 * @internal param \Xml_Node_ $xml_columns
+	 * @return void
+	 */
+	function SelectColumnsTag($xml_columns_tag)
+	{
+		if (!$xml_columns_tag)
+			$xml_columns_tag = new Xml_Node_();
 
-			$xml_columns = $xml_columns_tag->column;
-			$xml_queries = $xml_columns_tag->query;
+		$xml_columns = $xml_columns_tag->column;
+		$xml_queries = $xml_columns_tag->query;
 
-			$this->columns = array();
+		$this->columns = array();
 
-			if(!$xml_columns) {
-				$this->columns[] = new SelectColumnTag("*");
-				return;
-			}
-
-			if(!is_array($xml_columns)) $xml_columns = array($xml_columns);
-
-			foreach($xml_columns as $column){
-				$this->columns[] = new SelectColumnTag($column);
-			}
-
-
-			if(!$xml_queries) {
-				return;
-			}
-
-			if(!is_array($xml_queries)) $xml_queries = array($xml_queries);
-
-			foreach($xml_queries as $column){
-				$this->columns[] = new QueryTag($column, true);
-			}
+		if(!$xml_columns) {
+			$this->columns[] = new SelectColumnTag("*");
+			return;
 		}
 
-		/**
-		 * SelectColumnTag object to string
-		 * @return string
-		 */
-		function toString(){
-			$output_columns = 'array(' . PHP_EOL;
-			foreach($this->columns as $column){
-				if(is_a($column, 'QueryTag'))
-					$output_columns .= $column->toString() . PHP_EOL . ',';
-				else
-					$output_columns .= $column->getExpressionString() . PHP_EOL . ',';
-			}
-			$output_columns = substr($output_columns, 0, -1);
-			$output_columns .= ')';
-			return $output_columns;
+		if(!is_array($xml_columns)) $xml_columns = array($xml_columns);
+
+		foreach($xml_columns as $column){
+			$this->columns[] = new SelectColumnTag($column);
 		}
 
-		/**
-		 * Return argument list
-		 * @return array
-		 */
-		function getArguments(){
-			$arguments = array();
-			foreach($this->columns as $column){
-				if(is_a($column, 'QueryTag'))
-					$arguments = array_merge($arguments, $column->getArguments());
-			}
-			return $arguments;
+
+		if(!$xml_queries) {
+			return;
+		}
+
+		if(!is_array($xml_queries)) $xml_queries = array($xml_queries);
+
+		foreach($xml_queries as $column){
+			$this->columns[] = new QueryTag($column, TRUE);
 		}
 	}
+
+	/**
+	 * Returns the string to be output in the cache file
+	 *
+	 * @return string
+	 */
+	function toString()
+	{
+		$output_columns = 'array(' . PHP_EOL;
+		foreach($this->columns as $column){
+			if(is_a($column, 'QueryTag'))
+				$output_columns .= $column->toString() . PHP_EOL . ',';
+			else
+				$output_columns .= $column->getExpressionString() . PHP_EOL . ',';
+		}
+		$output_columns = substr($output_columns, 0, -1);
+		$output_columns .= ')';
+		return $output_columns;
+	}
+
+	/**
+	 * Return argument list
+	 *
+	 * @return array
+	 */
+	function getArguments()
+	{
+		$arguments = array();
+		foreach($this->columns as $column){
+			if(is_a($column, 'QueryTag'))
+				$arguments = array_merge($arguments, $column->getArguments());
+		}
+		return $arguments;
+	}
+}
 ?>

classes/xml/xmlquery/tags/column/UpdateColumnTag.class.php

@@ -1,73 +1,100 @@
 <?php
+/**
+ * UpdateColumnTag
+ * Models the <column> tag inside an XML Query file whose action is 'update'
+ *
+ * @author Corina Udrescu (corina.udrescu@arnia.ro)
+ * @package /classes/xml/xmlquery/tags/column
+ * @version 0.1
+ */
+class UpdateColumnTag extends ColumnTag {
 	/**
-	 * UpdateColumnTag
-	 * Models the <column> tag inside an XML Query file whose action is 'update'
-	 *
-	 * @author Arnia Software
-	 * @package /classes/xml/xmlquery/tags/column
-	 * @version 0.1
+	 * Argument
+	 * @var QueryArgument object
 	 */
-	class UpdateColumnTag extends ColumnTag {
-		/**
-		 * argument
-		 * @var QueryArgument object
-		 */
-		var $argument;
-		/**
-		 * default value
-		 * @var string
-		 */
-                var $default_value;
+	var $argument;
 
-		/**
-		 * constructor
-		 * @param object $column
-		 * @return void
-		 */
-		function UpdateColumnTag($column) {
-			parent::ColumnTag($column->attrs->name);
-			$dbParser = DB::getParser();
-			$this->name = $dbParser->parseColumnName($this->name);
-                        if($column->attrs->var)
-                            $this->argument = new QueryArgument($column);
-                        else {
-                            if(strpos($column->attrs->default, '.') !== false)
-                                    $this->default_value = "'" . $dbParser->parseColumnName($column->attrs->default) . "'";
-                            else {
-                                $default_value = new DefaultValue($this->name, $column->attrs->default);
-                                if($default_value->isOperation())
-                                    $this->argument = new QueryArgument($column, true);
-                            //else $this->default_value = $dbParser->parseColumnName($column->attrs->default);
-                                else {
-                                    $this->default_value = $default_value->toString();
-                                    if($default_value->isStringFromFunction()){
-                                        $this->default_value = '"\'".' . $this->default_value . '."\'"';
-                                    }
-                                    if($default_value->isString()){
-                                        $this->default_value = '"' . $this->default_value . '"';
-                                    }
-                                }
+	/**
+	 * Default value
+	 * @var string
+	 */
+	var $default_value;
+
+	/**
+	 * Constructor
+	 * @param object $column
+	 * @return void
+	 */
+	function UpdateColumnTag($column)
+	{
+		parent::ColumnTag($column->attrs->name);
+
+		$dbParser = DB::getParser();
+		$this->name = $dbParser->parseColumnName($this->name);
+
+		if($column->attrs->var)
+			$this->argument = new QueryArgument($column);
+		else {
+			if(strpos($column->attrs->default, '.') !== FALSE)
+			{
+				$this->default_value = "'" . $dbParser->parseColumnName($column->attrs->default) . "'";
+			}
+			else
+			{
+				$default_value = new DefaultValue($this->name, $column->attrs->default);
+				if($default_value->isOperation())
+				{
+					$this->argument = new QueryArgument($column, TRUE);
+				}
+				//else $this->default_value = $dbParser->parseColumnName($column->attrs->default);
+				else
+				{
+					$this->default_value = $default_value->toString();
+					if($default_value->isStringFromFunction())
+					{
+						$this->default_value = '"\'".' . $this->default_value . '."\'"';
+					}
+					if($default_value->isString())
+					{
+						$this->default_value = '"' . $this->default_value . '"';
+					}
+				}
 
 
-                            }
-                        }
-		}
-
-		function getExpressionString(){
-                    if($this->argument)
-			return sprintf('new UpdateExpression(\'%s\', ${\'%s_argument\'})'
-						, $this->name
-						, $this->argument->argument_name);
-                    else {
-			return sprintf('new UpdateExpressionWithoutArgument(\'%s\', %s)'
-						, $this->name
-						, $this->default_value);
-                    }
-		}
-
-		function getArgument(){
-			return $this->argument;
+			}
 		}
 	}
 
+	/**
+	 * Returns the string to be output in the cache file
+	 *
+	 * @return string
+	 */
+	function getExpressionString()
+	{
+		if($this->argument)
+		{
+			return sprintf('new UpdateExpression(\'%s\', ${\'%s_argument\'})'
+				, $this->name
+				, $this->argument->argument_name);
+		}
+		else
+		{
+			return sprintf('new UpdateExpressionWithoutArgument(\'%s\', %s)'
+						, $this->name
+						, $this->default_value);
+		}
+	}
+
+	/**
+	 * Returns the Argument associated with this update statement
+	 *
+	 * @return QueryArgument
+	 */
+	function getArgument()
+	{
+		return $this->argument;
+	}
+}
+
 ?>

classes/xml/xmlquery/tags/column/UpdateColumnsTag.class.php

@@ -1,61 +1,66 @@
 <?php
+/**
+ * UpdateColumnsTag
+ * Models the <columns> tag inside an XML Query file whose action is 'update'
+ *
+ * @author Corina Udrescu (corina.udrescu@arnia.ro)
+ * @package /classes/xml/xmlquery/tags/column
+ * @version 0.1
+ */
+class UpdateColumnsTag{
 	/**
-	 * UpdateColumnsTag
-	 * Models the <column> tag inside an XML Query file whose action is 'update'
-	 *
-	 * @author Arnia Software
-	 * @package /classes/xml/xmlquery/tags/column
-	 * @version 0.1
+	 * Column list
+	 * @var array value is UpdateColumnTag object
 	 */
-	class UpdateColumnsTag{
-		/**
-		 * Column list
-		 * @var array value is UpdateColumnTag object
-		 */
-		var $columns;
+	var $columns;
 
-		/**
-		 * constructor
-		 * @param array|string $xml_columns
-		 * @return void
-		 */
-		function UpdateColumnsTag($xml_columns) {
-			$this->columns = array();
+	/**
+	 * Constructor
+	 * @param array|object $xml_columns
+	 * @return void
+	 */
+	function UpdateColumnsTag($xml_columns)
+	{
+		$this->columns = array();
 
-			if(!is_array($xml_columns)) $xml_columns = array($xml_columns);
+		if(!is_array($xml_columns)) $xml_columns = array($xml_columns);
 
-			foreach($xml_columns as $column){
-				if($column->name === 'query') $this->columns[] = new QueryTag($column, true);
-				else $this->columns[] = new UpdateColumnTag($column);
-			}
+		foreach($xml_columns as $column){
+			if($column->name === 'query') $this->columns[] = new QueryTag($column, true);
+			else $this->columns[] = new UpdateColumnTag($column);
 		}
-
-		/**
-		 * UpdateColumnTag object to string
-		 * @return string
-		 */
-		function toString(){
-			$output_columns = 'array(' . PHP_EOL;
-			foreach($this->columns as $column){
-				$output_columns .= $column->getExpressionString() . PHP_EOL . ',';
-			}
-			$output_columns = substr($output_columns, 0, -1);
-			$output_columns .= ')';
-			return $output_columns;
-		}
-
-		/**
-		 * Return argument list
-		 * @return array
-		 */
-		function getArguments(){
-			$arguments = array();
-			foreach($this->columns as $column){
-				$arguments[] = $column->getArgument();
-			}
-			return $arguments;
-		}
-
 	}
 
+	/**
+	 * Returns the string to be output in the cache file
+	 *
+	 * @return string
+	 */
+	function toString()
+	{
+		$output_columns = 'array(' . PHP_EOL;
+		foreach($this->columns as $column){
+			$output_columns .= $column->getExpressionString() . PHP_EOL . ',';
+		}
+		$output_columns = substr($output_columns, 0, -1);
+		$output_columns .= ')';
+		return $output_columns;
+	}
+
+	/**
+	 * Return argument list
+	 *
+	 * @return array
+	 */
+	function getArguments()
+	{
+		$arguments = array();
+		foreach($this->columns as $column){
+			$arguments[] = $column->getArgument();
+		}
+		return $arguments;
+	}
+
+}
+
 ?>