Merged 1.4 to HEAD

svn merge svn://svn.alfresco.com:3691/alfresco/BRANCHES/V1.4@4380 svn://svn.alfresco.com:3691/alfresco/BRANCHES/V1.4@4386 .


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@4659 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/cache/NullCache.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2005 Alfresco, Inc.
+ *
+ * Licensed under the Mozilla Public License version 1.1 
+ * with a permitted attribution clause. You may obtain a
+ * copy of the License at
+ *
+ *   http://www.alfresco.org/legal/license.txt
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific
+ * language governing permissions and limitations under the
+ * License.
+ */
+package org.alfresco.repo.cache;
+
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.Collections;
+
+/**
+ * A cache that does nothing - always.
+ * <P/>
+ * There are conditions under which code that expects to be caching, should not be.  Using this
+ * cache, it becomes possible to configure a valid cache in whilst still ensuring that the
+ * actual caching is not performed.
+ * 
+ * @author Derek Hulley
+ */
+public class NullCache<K extends Serializable, V extends Serializable> implements SimpleCache<K, V>
+{
+    public NullCache()
+    {
+    }
+
+    /** NO-OP */
+    public boolean contains(K key)
+    {
+        return false;
+    }
+
+    public Collection<K> getKeys()
+    {
+        return Collections.<K>emptyList();
+    }
+
+    /** NO-OP */
+    public V get(K key)
+    {
+        return null;
+    }
+
+    /** NO-OP */
+    public void put(K key, V value)
+    {
+        return;
+    }
+
+    /** NO-OP */
+    public void remove(K key)
+    {
+        return;
+    }
+
+    /** NO-OP */
+    public void clear()
+    {
+        return;
+    }
+}