Importing upstream Jetty jetty-9.2.1.v20140609

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

diff --git a/lib/jetty/org/eclipse/jetty/server/handler/AbstractHandlerContainer.java b/lib/jetty/org/eclipse/jetty/server/handler/AbstractHandlerContainer.java
new file mode 100644 (file)
index 0000000..0d54e53
--- /dev/null
+++ b/lib/jetty/org/eclipse/jetty/server/handler/AbstractHandlerContainer.java
@@ -0,0 +1,118 @@
+//
+//  ========================================================================
+//  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.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.eclipse.jetty.server.Handler;
+import org.eclipse.jetty.server.HandlerContainer;
+
+
+/* ------------------------------------------------------------ */
+/** 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()
+    {
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public Handler[] getChildHandlers()
+    {
+        List<Handler> list=new ArrayList<>();
+        expandChildren(list,null);
+        return list.toArray(new Handler[list.size()]);
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public Handler[] getChildHandlersByClass(Class<?> byclass)
+    {
+        List<Handler> list=new ArrayList<>();
+        expandChildren(list,byclass);
+        return list.toArray(new Handler[list.size()]);
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public <T extends Handler> T getChildHandlerByClass(Class<T> byclass)
+    {
+        List<Handler> list=new ArrayList<>();
+        expandChildren(list,byclass);
+        if (list.isEmpty())
+            return null;
+        return (T)list.get(0);
+    }
+
+    /* ------------------------------------------------------------ */
+    protected void expandChildren(List<Handler> list, Class<?> byClass)
+    {
+    }
+
+    /* ------------------------------------------------------------ */
+    protected void expandHandler(Handler handler, List<Handler> list, Class<?> byClass)
+    {
+        if (handler==null)
+            return;
+
+        if (byClass==null || byClass.isAssignableFrom(handler.getClass()))
+            list.add(handler);
+
+        if (handler instanceof AbstractHandlerContainer)
+            ((AbstractHandlerContainer)handler).expandChildren(list, byClass);
+        else if (handler instanceof HandlerContainer)
+        {
+            HandlerContainer container = (HandlerContainer)handler;
+            Handler[] handlers=byClass==null?container.getChildHandlers():container.getChildHandlersByClass(byClass);
+            list.addAll(Arrays.asList(handlers));
+        }
+    }
+
+    /* ------------------------------------------------------------ */
+    public static <T extends HandlerContainer> T findContainerOf(HandlerContainer root,Class<T>type, Handler handler)
+    {
+        if (root==null || handler==null)
+            return null;
+
+        Handler[] branches=root.getChildHandlersByClass(type);
+        if (branches!=null)
+        {
+            for (Handler h:branches)
+            {
+                T container = (T)h;
+                Handler[] candidates = container.getChildHandlersByClass(handler.getClass());
+                if (candidates!=null)
+                {
+                    for (Handler c:candidates)
+                        if (c==handler)
+                            return container;
+                }
+            }
+        }
+        return null;
+    }
+}