1 files changed, 88 insertions, 0 deletions
diff --git a/jetty-server/src/main/java/org/eclipse/jetty/server/handler/AbstractHandlerContainer.java b/jetty-server/src/main/java/org/eclipse/jetty/server/handler/AbstractHandlerContainer.java
new file mode 100644
index 0000000000..b5eeb780bb
--- /dev/null
+++ b/jetty-server/src/main/java/org/eclipse/jetty/server/handler/AbstractHandlerContainer.java
@@ -0,0 +1,88 @@
+// ========================================================================
+// Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
+// ------------------------------------------------------------------------
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the Eclipse Public License v1.0
+// and Apache License v2.0 which accompanies this distribution.
+// The Eclipse Public License is available at 
+// http://www.eclipse.org/legal/epl-v10.html
+// The Apache License v2.0 is available at
+// http://www.opensource.org/licenses/apache2.0.php
+// You may elect to redistribute this code under either of these licenses. 
+// ========================================================================
+
+package org.eclipse.jetty.server.handler;
+
+
+import org.eclipse.jetty.server.Handler;
+import org.eclipse.jetty.server.HandlerContainer;
+import org.eclipse.jetty.util.LazyList;
+
+
+/* ------------------------------------------------------------ */
+/** Abstract Handler Container.
+ * This is the base class for handlers that may contain other handlers.
+ *  
+ * 
+ *
+ */
+public abstract class AbstractHandlerContainer extends AbstractHandler implements HandlerContainer
+{
+    /* ------------------------------------------------------------ */
+    public AbstractHandlerContainer()
+    {
+    }
+
+    /* ------------------------------------------------------------ */
+    public Handler[] getChildHandlers()
+    {
+        Object list = expandChildren(null,null);
+        return (Handler[])LazyList.toArray(list, Handler.class);
+    }
+        
+    /* ------------------------------------------------------------ */
+    public Handler[] getChildHandlersByClass(Class<?> byclass)
+    {
+        Object list = expandChildren(null,byclass);
+        return (Handler[])LazyList.toArray(list, byclass);
+    }
+    
+    /* ------------------------------------------------------------ */
+    public Handler getChildHandlerByClass(Class<?> byclass)
+    {
+        // TODO this can be more efficient?
+        Object list = expandChildren(null,byclass);
+        if (list==null)
+            return null;
+        return LazyList.get(list, 0);
+    }
+    
+    /* ------------------------------------------------------------ */
+    protected Object expandChildren(Object list, Class<?> byClass)
+    {
+        return list;
+    }
+
+    /* ------------------------------------------------------------ */
+    protected Object expandHandler(Handler handler, Object list, Class<Handler> byClass)
+    {
+        if (handler==null)
+            return list;
+        
+        if (handler!=null && (byClass==null || byClass.isAssignableFrom(handler.getClass())))
+            list=LazyList.add(list, handler);
+
+        if (handler instanceof AbstractHandlerContainer)
+            list=((AbstractHandlerContainer)handler).expandChildren(list, byClass);
+        else if (handler instanceof HandlerContainer)
+        {
+            HandlerContainer container = (HandlerContainer)handler;
+            Handler[] handlers=byClass==null?container.getChildHandlers():container.getChildHandlersByClass(byClass);
+            list=LazyList.addArray(list, handlers);
+        }
+        
+        return list;
+    }
+    
+    
+}