package org.eclipse.jetty.deploy.bindings;
   //========================================================================
   //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. 
  //========================================================================
  
  import java.net.URL;
  
  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.ContextHandler;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  import org.eclipse.jetty.util.resource.FileResource;
  import org.eclipse.jetty.util.resource.Resource;
  import org.eclipse.jetty.webapp.WebAppContext;
  import org.eclipse.jetty.xml.XmlConfiguration;
  
  /**
   * Provides a way of globally setting various aspects of webapp contexts.
   * 
   * Adding this binding will allow the user to arbitrarily apply a file of 
   * jetty-web.xml like settings to a webapp context.
   * 
   * Example usage would be:
   * - adding a server or system class setting to all webapp contexts
   * - adding an override descriptor 
   * 
   * Note: Currently properties from startup will not be available for 
   * reference.
   *
   */
  public class GlobalWebappConfigBinding implements AppLifeCycle.Binding
  {
      private static final Logger LOG = Log.getLogger(GlobalWebappConfigBinding.class);
  
  
      private String _jettyXml;
  
      public String getJettyXml()
      {
          return _jettyXml;
      }
  
      public void setJettyXml(String jettyXml)
      {
          this._jettyXml = jettyXml;
      }
  
      public String[] getBindingTargets()
      {
          return new String[]  { "deploying" };
      }
  
      public void processBinding(Node node, App app) throws Exception
      {
          ContextHandler handler = app.getContextHandler();
          if (handler == null)
          {
              throw new NullPointerException("No Handler created for App: " + app);
          }
  
          if (handler instanceof WebAppContext)
          {
              WebAppContext context = (WebAppContext)handler;
  
              if (LOG.isDebugEnabled())
              {
                  LOG.debug("Binding: Configuring webapp context with global settings from: " + _jettyXml);
              }
  
              if ( _jettyXml == null )
              {
                  LOG.warn("Binding: global context binding is enabled but no jetty-web.xml file has been registered");
              }
              
              Resource globalContextSettings = Resource.newResource(_jettyXml);
  
              if (globalContextSettings.exists())
              {
                  XmlConfiguration jettyXmlConfig = new XmlConfiguration(globalContextSettings.getInputStream());
  
                  jettyXmlConfig.configure(context);
              }
              else
              {
                  LOG.info("Binding: Unable to locate global webapp context settings: " + _jettyXml);
             }
         }
     }
 
 }