// ========================================================================
   // Copyright (c) Webtide LLC
   // ------------------------------------------------------------------------
   // 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.apache.org/licenses/LICENSE-2.0.txt
  //
  // You may elect to redistribute this code under either of these licenses. 
  // ========================================================================
  package org.eclipse.jetty.deploy.bindings;
  
  import org.eclipse.jetty.deploy.App;
  import org.eclipse.jetty.deploy.AppLifeCycle;
  import org.eclipse.jetty.deploy.graph.Node;
  import org.eclipse.jetty.server.Handler;
  import org.eclipse.jetty.server.handler.ContextHandler;
  import org.eclipse.jetty.server.handler.ContextHandlerCollection;
  import org.eclipse.jetty.server.handler.HandlerCollection;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  
  public class StandardUndeployer implements AppLifeCycle.Binding
  {
      private static final Logger LOG = Log.getLogger(StandardUndeployer.class);
  
      public String[] getBindingTargets()
      {
          return new String[]
          { "undeploying" };
      }
  
      public void processBinding(Node node, App app) throws Exception
      {
          ContextHandler handler = app.getContextHandler();
          ContextHandlerCollection chcoll = app.getDeploymentManager().getContexts();
  
          recursiveRemoveContext(chcoll,handler);
      }
  
      private void recursiveRemoveContext(HandlerCollection coll, ContextHandler context)
      {
          Handler children[] = coll.getHandlers();
          int originalCount = children.length;
  
          for (int i = 0, n = children.length; i < n; i++)
          {
              Handler child = children[i];
              LOG.debug("Child handler {}",child);
              if (child.equals(context))
              {
                  LOG.debug("Removing handler {}",child);
                  coll.removeHandler(child);
                  child.destroy();
                  if (LOG.isDebugEnabled())
                      LOG.debug("After removal: {} (originally {})",coll.getHandlers().length,originalCount);
              }
              else if (child instanceof HandlerCollection)
              {
                  recursiveRemoveContext((HandlerCollection)child,context);
              }
          }
      }
  }