Importing upstream Jetty jetty-9.2.1.v20140609

[gigi.git] / lib / jetty / org / eclipse / jetty / server / handler / HandlerWrapper.java

diff --git a/lib/jetty/org/eclipse/jetty/server/handler/HandlerWrapper.java b/lib/jetty/org/eclipse/jetty/server/handler/HandlerWrapper.java
new file mode 100644 (file)
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+++ b/lib/jetty/org/eclipse/jetty/server/handler/HandlerWrapper.java
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+//
+//  ========================================================================
+//  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 java.util.List;
+
+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.annotation.ManagedAttribute;
+import org.eclipse.jetty.util.annotation.ManagedObject;
+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.
+ *
+ */
+@ManagedObject("Handler wrapping another Handler")
+public class HandlerWrapper extends AbstractHandlerContainer
+{
+    protected Handler _handler;
+
+    /* ------------------------------------------------------------ */
+    /**
+     *
+     */
+    public HandlerWrapper()
+    {
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @return Returns the handlers.
+     */
+    @ManagedAttribute(value="Wrapped Handler", readonly=true)
+    public Handler getHandler()
+    {
+        return _handler;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @return Returns the handlers.
+     */
+    @Override
+    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);
+
+        if (handler!=null)
+            handler.setServer(getServer());
+        
+        Handler old=_handler;
+        _handler=handler;
+        updateBean(old,_handler);
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    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)
+    {
+        if (server==getServer())
+            return;
+        
+        if (isStarted())
+            throw new IllegalStateException(STARTED);
+
+        super.setServer(server);
+        Handler h=getHandler();
+        if (h!=null)
+            h.setServer(server);
+    }
+
+
+    /* ------------------------------------------------------------ */
+    @Override
+    protected void expandChildren(List<Handler> list, Class<?> byClass)
+    {
+        expandHandler(_handler,list,byClass);
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public void destroy()
+    {
+        if (!isStopped())
+            throw new IllegalStateException("!STOPPED");
+        Handler child=getHandler();
+        if (child!=null)
+        {
+            setHandler(null);
+            child.destroy();
+        }
+        super.destroy();
+    }
+
+}