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+<?php
+/**
+ * THead class file
+ *
+ * @author Marcus Nyeholt <tanus@users.sourceforge.net> and Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright &copy; 2005-2014 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @package System.Web.UI
+ */
+
+
+/**
+ * TMetaTagCollection class
+ *
+ * TMetaTagCollection represents a collection of meta tags
+ * contained in a {@link THead} control.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System.Web.UI.WebControls
+ * @since 3.0
+ */
+class TMetaTagCollection extends TList
+{
+ /**
+ * Inserts an item at the specified position.
+ * This overrides the parent implementation by performing type
+ * check on the item being added.
+ * @param integer the speicified position.
+ * @param mixed new item
+ * @throws TInvalidDataTypeException if the item to be inserted is not a {@link TMetaTag}
+ */
+ public function insertAt($index,$item)
+ {
+ if($item instanceof TMetaTag)
+ parent::insertAt($index,$item);
+ else
+ throw new TInvalidDataTypeException('metatagcollection_metatag_invalid');
+ }
+
+ /**
+ * Finds the lowest cardinal index of the meta tag whose id is the one being looked for.
+ * @param string the ID of the meta tag to be looked for
+ * @return integer the index of the meta tag found, -1 if not found.
+ */
+ public function findIndexByID($id)
+ {
+ $index=0;
+ foreach($this as $item)
+ {
+ if($item->getID()===$id)
+ return $index;
+ $index++;
+ }
+ return -1;
+ }
+
+ /**
+ * Finds the item whose value is the one being looked for.
+ * @param string the id of the meta tag to be looked for
+ * @return TMetaTag the meta tag found, null if not found.
+ */
+ public function findMetaTagByID($id)
+ {
+ if(($index=$this->findIndexByID($id))>=0)
+ return $this->itemAt($index);
+ else
+ return null;
+ }
+} \ No newline at end of file