/*
    * 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.renderkit.html;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.myfaces.shared_impl.renderkit.html.HtmlRendererUtils;
  import org.apache.myfaces.shared_impl.renderkit.html.HtmlResponseWriterImpl;
  
  import javax.faces.context.ResponseStream;
  import javax.faces.context.ResponseWriter;
  import javax.faces.render.RenderKit;
  import javax.faces.render.Renderer;
  import javax.faces.render.ResponseStateManager;
  import java.io.OutputStream;
  import java.io.Writer;
  import java.io.IOException;
  import java.util.*;
  
  
  /**
   * @JSFRenderKit
   *   renderKitId = "HTML_BASIC"
   * 
   * @author Manfred Geiler (latest modification by $Author: lu4242 $)
   * @version $Revision: 659857 $ $Date: 2008-05-24 13:17:47 -0500 (Sat, 24 May 2008) $
   */
  public class HtmlRenderKitImpl
      extends RenderKit
  {
      private static final Log log = LogFactory.getLog(HtmlRenderKitImpl.class);
  
      //~ Instance fields ----------------------------------------------------------------------------
  
      private Map _renderers;
      private ResponseStateManager _responseStateManager;
  
      //~ Constructors -------------------------------------------------------------------------------
  
      public HtmlRenderKitImpl()
      {
          _renderers = new HashMap();
          _responseStateManager = new HtmlResponseStateManager();
      }
  
      //~ Methods ------------------------------------------------------------------------------------
  
      private String key(String componentFamily, String rendererType)
      {
          return componentFamily + "." + rendererType;
      }
  
      public Renderer getRenderer(String componentFamily, String rendererType)
      {
          if(componentFamily == null)
          {
              throw new NullPointerException("component family must not be null.");
          }
          if(rendererType == null)
          {
              throw new NullPointerException("renderer type must not be null.");
          }
          Renderer renderer = (Renderer) _renderers.get(key(componentFamily, rendererType));
          if (renderer == null)
          {
              log.warn("Unsupported component-family/renderer-type: " + componentFamily + "/" + rendererType);
          }
          return renderer;
      }
  
      public void addRenderer(String componentFamily, String rendererType, Renderer renderer)
      {
          if(componentFamily == null)
          {
              log.error("addRenderer: componentFamily = null is not allowed");
              throw new NullPointerException("component family must not be null.");
          }
          if(rendererType == null)
          {
              log.error("addRenderer: rendererType = null is not allowed");
              throw new NullPointerException("renderer type must not be null.");
          }
          if(renderer == null)
         {
             log.error("addRenderer: renderer = null is not allowed");
             throw new NullPointerException("renderer must not be null.");
         }
 
         String rendererKey = key(componentFamily, rendererType);
         if (_renderers.get(rendererKey) != null) {
             // this is not necessarily an error, but users do need to be
             // very careful about jar processing order when overriding
             // some component's renderer with an alternate renderer.
             log.info("Overwriting renderer with family = " + componentFamily +
                " rendererType = " + rendererType +
                " renderer class = " + renderer.getClass().getName());
         }
 
         _renderers.put(rendererKey, renderer);
 
         if (log.isTraceEnabled()) 
             log.trace("add Renderer family = " + componentFamily +
                 " rendererType = " + rendererType +
                 " renderer class = " + renderer.getClass().getName());
     }
 
     public ResponseStateManager getResponseStateManager()
     {
         return _responseStateManager;
     }
 
     public ResponseWriter createResponseWriter(Writer writer,
                                                String contentTypeListString,
                                                String characterEncoding)
     {
         String selectedContentType = HtmlRendererUtils.selectContentType(contentTypeListString);
 
         if(characterEncoding==null)
         {
             characterEncoding = HtmlRendererUtils.DEFAULT_CHAR_ENCODING;
         }
 
         return new HtmlResponseWriterImpl(writer, selectedContentType, characterEncoding);
     }
 
     public ResponseStream createResponseStream(OutputStream outputStream)
     {
         final OutputStream output = outputStream;
 
         return new ResponseStream()
         {
             public void write(int b) throws IOException
             {
                 output.write(b);
             }
 
 
             public void write(byte b[]) throws IOException
             {
                 output.write(b);
             }
 
 
             public void write(byte b[], int off, int len) throws IOException
             {
                 output.write(b, off, len);
             }
 
 
             public void flush() throws IOException
             {
                 output.flush();
             }
 
 
             public void close() throws IOException
             {
                 output.close();
             }
         };
     }
 }