/*
   * Copyright 2004 The Apache Software Foundation
   *
   * Licensed 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 javax.servlet;
  
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.util.Locale;
  
  /**
   * 
   * Provides a convenient implementation of the ServletResponse interface that
   * can be subclassed by developers wishing to adapt the response from a Servlet.
   * This class implements the Wrapper or Decorator pattern. Methods default to
   * calling through to the wrapped response object.
   * 
   * @author 	Various
   * @version 	$Version$
   * @since	v 2.3
   *
   * @see 	javax.servlet.ServletResponse
   *
   */
  
   
  public class ServletResponseWrapper implements ServletResponse {
  	private ServletResponse response;
  	/**
  	* Creates a ServletResponse adaptor wrapping the given response object.
  	* @throws java.lang.IllegalArgumentException if the response is null.
  	*/
  
  
  	public ServletResponseWrapper(ServletResponse response) {
  	    if (response == null) {
  		throw new IllegalArgumentException("Response cannot be null");
  	    }
  	    this.response = response;
  	}
  
  	/**
  	* Return the wrapped ServletResponse object.
  	*/
  
  	public ServletResponse getResponse() {
  		return this.response;
  	}	
  	
  	
  	/**
  	* Sets the response being wrapped. 
  	* @throws java.lang.IllegalArgumentException if the response is null.
  	*/
  	
  	public void setResponse(ServletResponse response) {
  	    if (response == null) {
  		throw new IllegalArgumentException("Response cannot be null");
  	    }
  	    this.response = response;
  	}
  
      /**
       * The default behavior of this method is to call setCharacterEncoding(String charset)
       * on the wrapped response object.
       *
       * @since 2.4
       */
  
      public void setCharacterEncoding(String charset) {
  	this.response.setCharacterEncoding(charset);
      }
  
      /**
       * The default behavior of this method is to return getCharacterEncoding()
       * on the wrapped response object.
       */
  
      public String getCharacterEncoding() {
  	return this.response.getCharacterEncoding();
  	}
      
      
  	  /**
       * The default behavior of this method is to return getOutputStream()
       * on the wrapped response object.
       */
  
     public ServletOutputStream getOutputStream() throws IOException {
 	return this.response.getOutputStream();
     }  
       
      /**
      * The default behavior of this method is to return getWriter()
      * on the wrapped response object.
      */
 
 
     public PrintWriter getWriter() throws IOException {
 	return this.response.getWriter();
 	}
     
     /**
      * The default behavior of this method is to call setContentLength(int len)
      * on the wrapped response object.
      */
 
     public void setContentLength(int len) {
 	this.response.setContentLength(len);
     }
     
     /**
      * The default behavior of this method is to call setContentType(String type)
      * on the wrapped response object.
      */
 
     public void setContentType(String type) {
 	this.response.setContentType(type);
     }
 
     /**
      * The default behavior of this method is to return getContentType()
      * on the wrapped response object.
      *
      * @since 2.4
      */
 
     public String getContentType() {
 	return this.response.getContentType();
     }
     
     /**
      * The default behavior of this method is to call setBufferSize(int size)
      * on the wrapped response object.
      */
     public void setBufferSize(int size) {
 	this.response.setBufferSize(size);
     }
     
     /**
      * The default behavior of this method is to return getBufferSize()
      * on the wrapped response object.
      */
     public int getBufferSize() {
 	return this.response.getBufferSize();
     }
 
     /**
      * The default behavior of this method is to call flushBuffer()
      * on the wrapped response object.
      */
 
     public void flushBuffer() throws IOException {
 	this.response.flushBuffer();
     }
     
     /**
      * The default behavior of this method is to return isCommitted()
      * on the wrapped response object.
      */
     public boolean isCommitted() {
 	return this.response.isCommitted();
     }
 
     /**
      * The default behavior of this method is to call reset()
      * on the wrapped response object.
      */
 
     public void reset() {
 	this.response.reset();
     }
     
     /**
      * The default behavior of this method is to call resetBuffer()
      * on the wrapped response object.
      */
      
     public void resetBuffer() {
 	this.response.resetBuffer();
     }
     
     /**
      * The default behavior of this method is to call setLocale(Locale loc)
      * on the wrapped response object.
      */
 
     public void setLocale(Locale loc) {
 	this.response.setLocale(loc);
     }
     
     /**
      * The default behavior of this method is to return getLocale()
      * on the wrapped response object.
      */
     public Locale getLocale() {
 	return this.response.getLocale();
     }
 
 
 }