Glassfish example source code file (ServletResponseWrapper.java)

This example Glassfish source code file (ServletResponseWrapper.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

given, illegalargumentexception, illegalargumentexception, io, ioexception, ioexception, locale, printwriter, response, servletoutputstream, servletresponse, servletresponse, servletresponsewrapper, servletresponsewrapper, string, util

The Glassfish ServletResponseWrapper.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * 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
 * @since Servlet 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 Servlet 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 Servlet 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();
    }


    /**
     * Checks (recursively) if this ServletResponseWrapper wraps the given
     * {@link ServletResponse} instance.
     *
     * @param wrapped the ServletResponse instance to search for
     *
     * @return true if this ServletResponseWrapper wraps the
     * given ServletResponse instance, false otherwise
     *
     * @since Servlet 3.0
     */
    public boolean isWrapperFor(ServletResponse wrapped) {
        if (response == wrapped) {
            return true;
        } else if (response instanceof ServletResponseWrapper) {
            return ((ServletResponseWrapper) response).isWrapperFor(wrapped);
        } else {
            return false;
        }
    }


    /**
     * Checks (recursively) if this ServletResponseWrapper wraps a
     * {@link ServletResponse} of the given class type.
     *
     * @param wrappedType the ServletResponse class type to
     * search for
     *
     * @return true if this ServletResponseWrapper wraps a
     * ServletResponse of the given class type, false otherwise
     *
     * @throws IllegalArgumentException if the given class does not
     * implement {@link ServletResponse}
     *
     * @since Servlet 3.0
     */
    public boolean isWrapperFor(Class wrappedType) {
        if (!ServletResponse.class.isAssignableFrom(wrappedType)) {
            throw new IllegalArgumentException("Given class " +
                wrappedType.getName() + " not a subinterface of " +
                ServletResponse.class.getName());
        }
        if (wrappedType.isAssignableFrom(response.getClass())) {
            return true;
        } else if (response instanceof ServletResponseWrapper) {
            return ((ServletResponseWrapper) response).isWrapperFor(wrappedType);
        } else {
            return false;
        }
    }

}