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/*
* Copyright (c) 1997, 2023 Oracle and/or its affiliates and others.
* All rights reserved.
* 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 jakarta.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.charset.Charset;
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 jakarta.servlet.ServletResponse
*/
public class ServletResponseWrapper implements ServletResponse {
private ServletResponse response;
/**
* Creates a ServletResponse adaptor wrapping the given response object.
*
* @param response the {@link ServletResponse} to be wrapped
*
* @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.
*
* @return the wrapped {@link ServletResponse}
*/
public ServletResponse getResponse() {
return this.response;
}
/**
* Sets the response being wrapped.
*
* @param response the {@link ServletResponse} to be installed
*
* @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 encoding) on the wrapped response object.
*
* @since Servlet 2.4
*/
@Override
public void setCharacterEncoding(String encoding) {
this.response.setCharacterEncoding(encoding);
}
/**
* The default behavior of this method is to call setCharacterEncoding(Charset encoding) on the wrapped response object.
*
* @since Servlet 6.1
*/
@Override
public void setCharacterEncoding(Charset encoding) {
this.response.setCharacterEncoding(encoding);
}
/**
* 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 len) {
this.response.setContentLengthLong(len);
}
/**
* 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();
}
/**
* 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;
}
}
}
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