org.mortbay.jetty.handler.AbstractHandlerContainer Maven / Gradle / Ivy
//========================================================================
//$Id: AbstractHandler.java,v 1.4 2005/11/11 22:55:39 gregwilkins Exp $
//Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//http://www.apache.org/licenses/LICENSE-2.0
//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.mortbay.jetty.handler;
import org.mortbay.jetty.Handler;
import org.mortbay.jetty.HandlerContainer;
import org.mortbay.util.LazyList;
/* ------------------------------------------------------------ */
/** Abstract Handler Container.
* This is the base class for handlers that may contain other handlers.
*
* @author gregw
*
*/
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, Handler.class);
}
/* ------------------------------------------------------------ */
public Handler getChildHandlerByClass(Class byclass)
{
// TODO this can be more efficient?
Object list = expandChildren(null,byclass);
if (list==null)
return null;
return (Handler)LazyList.get(list, 0);
}
/* ------------------------------------------------------------ */
protected Object expandChildren(Object list, Class byClass)
{
return list;
}
/* ------------------------------------------------------------ */
protected Object expandHandler(Handler handler, Object list, Class 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;
}
}