Importing upstream Jetty jetty-9.2.1.v20140609

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

diff --git a/lib/jetty/org/eclipse/jetty/server/handler/HandlerCollection.java b/lib/jetty/org/eclipse/jetty/server/handler/HandlerCollection.java
new file mode 100644 (file)
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+++ b/lib/jetty/org/eclipse/jetty/server/handler/HandlerCollection.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.ArrayUtil;
+import org.eclipse.jetty.util.MultiException;
+import org.eclipse.jetty.util.annotation.ManagedAttribute;
+import org.eclipse.jetty.util.annotation.ManagedObject;
+
+/* ------------------------------------------------------------ */
+/** A collection of handlers.
+ * <p>
+ * The default implementations  calls all handlers in list order,
+ * regardless of the response status or exceptions. Derived implementation
+ * may alter the order or the conditions of calling the contained
+ * handlers.
+ * <p>
+ *
+ */
+@ManagedObject("Handler of multiple handlers")
+public class HandlerCollection extends AbstractHandlerContainer
+{
+    private final boolean _mutableWhenRunning;
+    private volatile Handler[] _handlers;
+
+    /* ------------------------------------------------------------ */
+    public HandlerCollection()
+    {
+        _mutableWhenRunning=false;
+    }
+
+    /* ------------------------------------------------------------ */
+    public HandlerCollection(boolean mutableWhenRunning)
+    {
+        _mutableWhenRunning=mutableWhenRunning;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @return Returns the handlers.
+     */
+    @Override
+    @ManagedAttribute(value="Wrapped handlers", readonly=true)
+    public Handler[] getHandlers()
+    {
+        return _handlers;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @param handlers The handlers to set.
+     */
+    public void setHandlers(Handler[] handlers)
+    {
+        if (!_mutableWhenRunning && isStarted())
+            throw new IllegalStateException(STARTED);
+
+        if (handlers!=null)
+            for (Handler handler:handlers)
+                if (handler.getServer()!=getServer())
+                    handler.setServer(getServer());
+        Handler[] old=_handlers;;
+        _handlers = handlers;
+        updateBeans(old, handlers);
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @see Handler#handle(String, Request, HttpServletRequest, HttpServletResponse)
+     */
+    @Override
+    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
+        throws IOException, ServletException
+    {
+        if (_handlers!=null && isStarted())
+        {
+            MultiException mex=null;
+
+            for (int i=0;i<_handlers.length;i++)
+            {
+                try
+                {
+                    _handlers[i].handle(target,baseRequest, request, response);
+                }
+                catch(IOException e)
+                {
+                    throw e;
+                }
+                catch(RuntimeException e)
+                {
+                    throw e;
+                }
+                catch(Exception e)
+                {
+                    if (mex==null)
+                        mex=new MultiException();
+                    mex.add(e);
+                }
+            }
+            if (mex!=null)
+            {
+                if (mex.size()==1)
+                    throw new ServletException(mex.getThrowable(0));
+                else
+                    throw new ServletException(mex);
+            }
+
+        }
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public void setServer(Server server)
+    {
+        super.setServer(server);
+        Handler[] handlers=getHandlers();
+        if (handlers!=null)
+            for (Handler h : handlers)
+                h.setServer(server);
+    }
+
+    /* ------------------------------------------------------------ */
+    /* Add a handler.
+     * This implementation adds the passed handler to the end of the existing collection of handlers.
+     * @see org.eclipse.jetty.server.server.HandlerContainer#addHandler(org.eclipse.jetty.server.server.Handler)
+     */
+    public void addHandler(Handler handler)
+    {
+        setHandlers(ArrayUtil.addToArray(getHandlers(), handler, Handler.class));
+    }
+
+    /* ------------------------------------------------------------ */
+    public void removeHandler(Handler handler)
+    {
+        Handler[] handlers = getHandlers();
+
+        if (handlers!=null && handlers.length>0 )
+            setHandlers(ArrayUtil.removeFromArray(handlers, handler));
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    protected void expandChildren(List<Handler> list, Class<?> byClass)
+    {
+        if (getHandlers()!=null)
+            for (Handler h:getHandlers())
+                expandHandler(h, list, byClass);
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public void destroy()
+    {
+        if (!isStopped())
+            throw new IllegalStateException("!STOPPED");
+        Handler[] children=getChildHandlers();
+        setHandlers(null);
+        for (Handler child: children)
+            child.destroy();
+        super.destroy();
+    }
+}