ServletResponseWrapper.java
/*
* 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 javax.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Locale;
import java.util.ResourceBundle;
/**
* 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.
*
* @since Servlet 2.3
*
* @see javax.servlet.ServletResponse
*/
public class ServletResponseWrapper implements ServletResponse {
private static final String LSTRING_FILE = "javax.servlet.LocalStrings";
private static final ResourceBundle lStrings = ResourceBundle.getBundle(LSTRING_FILE);
private ServletResponse response;
/**
* Creates a ServletResponse adaptor wrapping the given response object.
*
* @param response The response to wrap
*
* @throws java.lang.IllegalArgumentException if the response is null.
*/
public ServletResponseWrapper(ServletResponse response) {
if (response == null) {
throw new IllegalArgumentException(lStrings.getString("wrapper.nullResponse"));
}
this.response = response;
}
/**
* Return the wrapped ServletResponse object.
*
* @return The wrapped ServletResponse object.
*/
public ServletResponse getResponse() {
return this.response;
}
/**
* Sets the response being wrapped.
*
* @param response The new response to wrap
*
* @throws java.lang.IllegalArgumentException if the response is null.
*/
public void setResponse(ServletResponse response) {
if (response == null) {
throw new IllegalArgumentException(lStrings.getString("wrapper.nullResponse"));
}
this.response = response;
}
/**
* The default behavior of this method is to call setCharacterEncoding(String charset) on the wrapped response
* object.
*
* @since Servlet 2.4
*/
@Override
public void setCharacterEncoding(String charset) {
this.response.setCharacterEncoding(charset);
}
/**
* The default behavior of this method is to return getCharacterEncoding() on the wrapped response object.
*/
@Override
public String getCharacterEncoding() {
return this.response.getCharacterEncoding();
}
/**
* The default behavior of this method is to return getOutputStream() on the wrapped response object.
*/
@Override
public ServletOutputStream getOutputStream() throws IOException {
return this.response.getOutputStream();
}
/**
* The default behavior of this method is to return getWriter() on the wrapped response object.
*/
@Override
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.
*/
@Override
public void setContentLength(int len) {
this.response.setContentLength(len);
}
/**
* The default behavior of this method is to call setContentLengthLong(long len) on the wrapped response object.
*
* @since Servlet 3.1
*/
@Override
public void setContentLengthLong(long length) {
this.response.setContentLengthLong(length);
}
/**
* The default behavior of this method is to call setContentType(String type) on the wrapped response object.
*/
@Override
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
*/
@Override
public String getContentType() {
return this.response.getContentType();
}
/**
* The default behavior of this method is to call setBufferSize(int size) on the wrapped response object.
*/
@Override
public void setBufferSize(int size) {
this.response.setBufferSize(size);
}
/**
* The default behavior of this method is to return getBufferSize() on the wrapped response object.
*/
@Override
public int getBufferSize() {
return this.response.getBufferSize();
}
/**
* The default behavior of this method is to call flushBuffer() on the wrapped response object.
*/
@Override
public void flushBuffer() throws IOException {
this.response.flushBuffer();
}
/**
* The default behavior of this method is to return isCommitted() on the wrapped response object.
*/
@Override
public boolean isCommitted() {
return this.response.isCommitted();
}
/**
* The default behavior of this method is to call reset() on the wrapped response object.
*/
@Override
public void reset() {
this.response.reset();
}
/**
* The default behavior of this method is to call resetBuffer() on the wrapped response object.
*/
@Override
public void resetBuffer() {
this.response.resetBuffer();
}
/**
* The default behavior of this method is to call setLocale(Locale loc) on the wrapped response object.
*/
@Override
public void setLocale(Locale loc) {
this.response.setLocale(loc);
}
/**
* The default behavior of this method is to return getLocale() on the wrapped response object.
*/
@Override
public Locale getLocale() {
return this.response.getLocale();
}
/**
* TODO SERVLET3 - Add comments
*
* @param wrapped The response to compare to the wrapped response
*
* @return <code>true</code> if the response wrapped by this wrapper (or series of wrappers) is the same as the
* supplied response, otherwise <code>false</code>
*
* @since Servlet 3.0
*/
public boolean isWrapperFor(ServletResponse wrapped) {
if (response == wrapped) {
return true;
}
if (response instanceof ServletResponseWrapper) {
return ((ServletResponseWrapper) response).isWrapperFor(wrapped);
}
return false;
}
/**
* TODO SERVLET3 - Add comments
*
* @param wrappedType The class to compare to the class of the wrapped response
*
* @return <code>true</code> if the response wrapped by this wrapper (or series of wrappers) is the same type as the
* supplied type, otherwise <code>false</code>
*
* @since Servlet 3.0
*/
public boolean isWrapperFor(Class<?> wrappedType) {
if (wrappedType.isAssignableFrom(response.getClass())) {
return true;
}
if (response instanceof ServletResponseWrapper) {
return ((ServletResponseWrapper) response).isWrapperFor(wrappedType);
}
return false;
}
}