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vendor/yiisoft/yii2/caching/ChainedDependency.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\caching;
+
+/**
+ * ChainedDependency represents a dependency which is composed of a list of other dependencies.
+ *
+ * When [[dependOnAll]] is true, if any of the dependencies has changed, this dependency is
+ * considered changed; When [[dependOnAll]] is false, if one of the dependencies has NOT changed,
+ * this dependency is considered NOT changed.
+ *
+ * For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview).
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+class ChainedDependency extends Dependency
+{
+    /**
+     * @var Dependency[] list of dependencies that this dependency is composed of.
+     * Each array element must be a dependency object.
+     */
+    public $dependencies = [];
+    /**
+     * @var bool whether this dependency is depending on every dependency in [[dependencies]].
+     * Defaults to true, meaning if any of the dependencies has changed, this dependency is considered changed.
+     * When it is set false, it means if one of the dependencies has NOT changed, this dependency
+     * is considered NOT changed.
+     */
+    public $dependOnAll = true;
+
+
+    /**
+     * Evaluates the dependency by generating and saving the data related with dependency.
+     * @param CacheInterface $cache the cache component that is currently evaluating this dependency
+     */
+    public function evaluateDependency($cache)
+    {
+        foreach ($this->dependencies as $dependency) {
+            $dependency->evaluateDependency($cache);
+        }
+    }
+
+    /**
+     * Generates the data needed to determine if dependency has been changed.
+     * This method does nothing in this class.
+     * @param CacheInterface $cache the cache component that is currently evaluating this dependency
+     * @return mixed the data needed to determine if dependency has been changed.
+     */
+    protected function generateDependencyData($cache)
+    {
+        return null;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isChanged($cache)
+    {
+        foreach ($this->dependencies as $dependency) {
+            if ($this->dependOnAll && $dependency->isChanged($cache)) {
+                return true;
+            } elseif (!$this->dependOnAll && !$dependency->isChanged($cache)) {
+                return false;
+            }
+        }
+
+        return !$this->dependOnAll;
+    }
+}