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// ========================================================================
// 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 (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;
}
/* ------------------------------------------------------------ */
@Override
protected void dump(StringBuilder b,String indent)
{
super.dump(b,indent);
Handler[] handlers = getHandlers();
if (handlers!=null)
{
int last=handlers.length-1;
for (int h=0;h<=last;h++)
{
if (handlers[h]==null)
continue;
b.append(indent);
b.append(" +-");
if (handlers[h] instanceof AbstractHandler)
((AbstractHandler)handlers[h]).dump(b,indent+((h==last)?" ":" | "));
else
{
b.append(handlers[h]);
b.append("\n");
}
}
}
}
}
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