/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.myfaces.view.facelets.tag.composite;
  
  import java.io.Externalizable;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.ObjectInput;
  import java.io.ObjectOutput;
  import java.net.URL;
  import java.util.Map;
  
  import javax.faces.FacesWrapper;
  import javax.faces.application.Resource;
  import javax.faces.context.FacesContext;
  
  /**
   * The value inside composite component attribute map with the key
   * Resource.COMPONENT_RESOURCE_KEY should be a Serializable. This
   * wrapper add serialization to Resource instances, because 
   * ResourceImpl depends from the ResourceLoader used by it.
   * 
   * @author Leonardo Uribe (latest modification by $Author$)
   * @version $Revision$ $Date$
   */
  public final class CompositeResouceWrapper extends Resource 
      implements FacesWrapper<Resource>, Externalizable
  {
      /**
       * 
       */
      private static final long serialVersionUID = 8067930634887545843L;
      
      private transient Resource _delegate;
      
      public CompositeResouceWrapper()
      {
          super();
      }
      
      public CompositeResouceWrapper(Resource delegate)
      {
          super();
          this._delegate = delegate;
          setResourceName(delegate.getResourceName());
          setLibraryName(delegate.getLibraryName());
          setContentType(delegate.getContentType());
      }
  
  
      public InputStream getInputStream() throws IOException
      {
          return getWrapped().getInputStream();
      }
  
      public String getRequestPath()
      {
          return getWrapped().getRequestPath();
      }
  
      public Map<String, String> getResponseHeaders()
      {
          return getWrapped().getResponseHeaders();
      }
  
      public URL getURL()
      {
          return getWrapped().getURL();
      }
  
      public boolean userAgentNeedsUpdate(FacesContext context)
      {
          return getWrapped().userAgentNeedsUpdate(context);
      }
  
      public Resource getWrapped()
      {
          if (_delegate == null)
          {
              _delegate = FacesContext.getCurrentInstance().getApplication().
                              getResourceHandler().createResource(
                                      getResourceName(), 
                                      getLibraryName(),
                                     getContentType());
         }
         return _delegate;
     }
 
     public void readExternal(ObjectInput in) throws IOException,
             ClassNotFoundException
     {
         setResourceName((String) in.readObject());
         setLibraryName((String) in.readObject());
         setContentType((String) in.readObject());
     }
 
     public void writeExternal(ObjectOutput out) throws IOException
     {
         out.writeObject(getResourceName());
         out.writeObject(getLibraryName());
         out.writeObject(getContentType());
     }
     
     @Override
     public String toString()
     {
         // Delegate resource in this case could not be available in serialization, or
         // serialization could happen in other context. So it is better to return
         // a simple String representing the object without go into delegation.
         return ( (getLibraryName() != null) ? getLibraryName() : "") + ":"+ 
                ( (getResourceName() != null) ? getResourceName() : "") ;
     }
 }