| // |
| // ======================================================================== |
| // Copyright (c) 1995-2014 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 java.io.IOException; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.eclipse.jetty.server.Handler; |
| import org.eclipse.jetty.server.Request; |
| import org.eclipse.jetty.server.Server; |
| import org.eclipse.jetty.util.component.LifeCycle; |
| |
| /* ------------------------------------------------------------ */ |
| /** A <code>HandlerWrapper</code> acts as a {@link Handler} but delegates the {@link Handler#handle handle} method and |
| * {@link LifeCycle life cycle} events to a delegate. This is primarily used to implement the <i>Decorator</i> pattern. |
| * |
| */ |
| public class HandlerWrapper extends AbstractHandlerContainer |
| { |
| protected Handler _handler; |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * |
| */ |
| public HandlerWrapper() |
| { |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * @return Returns the handlers. |
| */ |
| public Handler getHandler() |
| { |
| return _handler; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * @return Returns the handlers. |
| */ |
| public Handler[] getHandlers() |
| { |
| if (_handler==null) |
| return new Handler[0]; |
| return new Handler[] {_handler}; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * @param handler Set the {@link Handler} which should be wrapped. |
| */ |
| public void setHandler(Handler handler) |
| { |
| if (isStarted()) |
| throw new IllegalStateException(STARTED); |
| |
| Handler old_handler = _handler; |
| _handler = handler; |
| if (handler!=null) |
| handler.setServer(getServer()); |
| |
| if (getServer()!=null) |
| getServer().getContainer().update(this, old_handler, handler, "handler"); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /* |
| * @see org.eclipse.thread.AbstractLifeCycle#doStart() |
| */ |
| @Override |
| protected void doStart() throws Exception |
| { |
| if (_handler!=null) |
| _handler.start(); |
| super.doStart(); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /* |
| * @see org.eclipse.thread.AbstractLifeCycle#doStop() |
| */ |
| @Override |
| protected void doStop() throws Exception |
| { |
| if (_handler!=null) |
| _handler.stop(); |
| super.doStop(); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException |
| { |
| if (_handler!=null && isStarted()) |
| { |
| _handler.handle(target,baseRequest, request, response); |
| } |
| } |
| |
| |
| /* ------------------------------------------------------------ */ |
| @Override |
| public void setServer(Server server) |
| { |
| Server old_server=getServer(); |
| if (server==old_server) |
| return; |
| |
| if (isStarted()) |
| throw new IllegalStateException(STARTED); |
| |
| super.setServer(server); |
| |
| Handler h=getHandler(); |
| if (h!=null) |
| h.setServer(server); |
| |
| if (server!=null && server!=old_server) |
| server.getContainer().update(this, null,_handler, "handler"); |
| } |
| |
| |
| /* ------------------------------------------------------------ */ |
| @Override |
| protected Object expandChildren(Object list, Class byClass) |
| { |
| return expandHandler(_handler,list,byClass); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| public <H extends Handler> H getNestedHandlerByClass(Class<H> byclass) |
| { |
| HandlerWrapper h=this; |
| while (h!=null) |
| { |
| if (byclass.isInstance(h)) |
| return (H)h; |
| Handler w = h.getHandler(); |
| if (w instanceof HandlerWrapper) |
| h=(HandlerWrapper)w; |
| else break; |
| } |
| return null; |
| |
| } |
| |
| /* ------------------------------------------------------------ */ |
| @Override |
| public void destroy() |
| { |
| if (!isStopped()) |
| throw new IllegalStateException("!STOPPED"); |
| Handler child=getHandler(); |
| if (child!=null) |
| { |
| setHandler(null); |
| child.destroy(); |
| } |
| super.destroy(); |
| } |
| |
| } |