1 files changed, 59 insertions, 0 deletions
diff --git a/framework/Caching/TChainedCacheDependency.php b/framework/Caching/TChainedCacheDependency.php
new file mode 100644
index 00000000..463919fd
--- /dev/null
+++ b/framework/Caching/TChainedCacheDependency.php
@@ -0,0 +1,59 @@
+<?php
+/**
+ * TCache and cache dependency classes.
+ *
+ * @author 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.Caching
+ */
+
+
+/**
+ * TChainedCacheDependency class.
+ *
+ * TChainedCacheDependency represents a list of cache dependency objects
+ * and performs the dependency checking based on the checking results of
+ * these objects. If any of them reports a dependency change, TChainedCacheDependency
+ * will return true for the checking.
+ *
+ * To add dependencies to TChainedCacheDependency, use {@link getDependencies Dependencies}
+ * which gives a {@link TCacheDependencyList} instance and can be used like an array
+ * (see {@link TList} for more details}).
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System.Caching
+ * @since 3.1.0
+ */
+class TChainedCacheDependency extends TCacheDependency
+{
+	private $_dependencies=null;
+
+	/**
+	 * @return TCacheDependencyList list of dependency objects
+	 */
+	public function getDependencies()
+	{
+		if($this->_dependencies===null)
+			$this->_dependencies=new TCacheDependencyList;
+		return $this->_dependencies;
+	}
+
+	/**
+	 * Performs the actual dependency checking.
+	 * This method returns true if any of the dependency objects
+	 * reports a dependency change.
+	 * @return boolean whether the dependency is changed or not.
+	 */
+	public function getHasChanged()
+	{
+		if($this->_dependencies!==null)
+		{
+			foreach($this->_dependencies as $dependency)
+				if($dependency->getHasChanged())
+					return true;
+		}
+		return false;
+	}
+}
+\ No newline at end of file