https://tomcat.apache.org/: Tomcat Servlet Engine Core Classes and Standard implementations 
/*
 * 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.catalina.core;

import java.io.IOException;
import java.util.Locale;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;



Wrapper around a javax.servlet.http.HttpServletResponse
that transforms an application response object (which might be the original
one passed to a servlet, or might be based on the 2.3
javax.servlet.http.HttpServletResponseWrapper class)
back into an internal org.apache.catalina.HttpResponse.


WARNING:  Due to Java's lack of support for multiple
inheritance, all of the logic in ApplicationResponse is
duplicated in ApplicationHttpResponse.  Make sure that you
keep these two classes in synchronization when making changes!

Author:Craig R. McClanahan
/**
 * Wrapper around a <code>javax.servlet.http.HttpServletResponse</code>
 * that transforms an application response object (which might be the original
 * one passed to a servlet, or might be based on the 2.3
 * <code>javax.servlet.http.HttpServletResponseWrapper</code> class)
 * back into an internal <code>org.apache.catalina.HttpResponse</code>.
 * <p>
 * <strong>WARNING</strong>:  Due to Java's lack of support for multiple
 * inheritance, all of the logic in <code>ApplicationResponse</code> is
 * duplicated in <code>ApplicationHttpResponse</code>.  Make sure that you
 * keep these two classes in synchronization when making changes!
 *
 * @author Craig R. McClanahan
 */
class ApplicationHttpResponse extends HttpServletResponseWrapper {

    // ----------------------------------------------------------- Constructors

    
Construct a new wrapped response around the specified servlet response.

Params:
  • response – The servlet response being wrapped
  • included – true if this response is being processed
 by a RequestDispatcher.include() call
/**
     * Construct a new wrapped response around the specified servlet response.
     *
     * @param response The servlet response being wrapped
     * @param included <code>true</code> if this response is being processed
     *  by a <code>RequestDispatcher.include()</code> call
     */
    public ApplicationHttpResponse(HttpServletResponse response,
                                   boolean included) {

        super(response);
        setIncluded(included);

    }


    // ----------------------------------------------------- Instance Variables


    
Is this wrapped response the subject of an include()
call?

/**
     * Is this wrapped response the subject of an <code>include()</code>
     * call?
     */
    protected boolean included = false;


    // ------------------------------------------------ ServletResponse Methods

    
Disallow reset() calls on a included response.

Throws:
  • IllegalStateException – if the response has already
 been committed
/**
     * Disallow <code>reset()</code> calls on a included response.
     *
     * @exception IllegalStateException if the response has already
     *  been committed
     */
    @Override
    public void reset() {

        // If already committed, the wrapped response will throw ISE
        if (!included || getResponse().isCommitted())
            getResponse().reset();

    }


    
Disallow setContentLength(int) calls on an included
response.

Params:
  • len – The new content length
/**
     * Disallow <code>setContentLength(int)</code> calls on an included
     * response.
     *
     * @param len The new content length
     */
    @Override
    public void setContentLength(int len) {

        if (!included)
            getResponse().setContentLength(len);

    }


    
Disallow setContentLengthLong(long) calls on an included
response.

Params:
  • len – The new content length
/**
     * Disallow <code>setContentLengthLong(long)</code> calls on an included
     * response.
     *
     * @param len The new content length
     */
    @Override
    public void setContentLengthLong(long len) {

        if (!included)
            getResponse().setContentLengthLong(len);

    }


    
Disallow setContentType() calls on an included response.

Params:
  • type – The new content type
/**
     * Disallow <code>setContentType()</code> calls on an included response.
     *
     * @param type The new content type
     */
    @Override
    public void setContentType(String type) {

        if (!included)
            getResponse().setContentType(type);

    }


    
Disallow setLocale() calls on an included response.

Params:
  • loc – The new locale
/**
     * Disallow <code>setLocale()</code> calls on an included response.
     *
     * @param loc The new locale
     */
    @Override
    public void setLocale(Locale loc) {

        if (!included)
            getResponse().setLocale(loc);

    }


    
Ignore setBufferSize() calls on an included response.

Params:
  • size – The buffer size
/**
     * Ignore <code>setBufferSize()</code> calls on an included response.
     *
     * @param size The buffer size
     */
    @Override
    public void setBufferSize(int size) {
        if (!included)
            getResponse().setBufferSize(size);
    }


    // -------------------------------------------- HttpServletResponse Methods


    
Disallow addCookie() calls on an included response.

Params:
  • cookie – The new cookie
/**
     * Disallow <code>addCookie()</code> calls on an included response.
     *
     * @param cookie The new cookie
     */
    @Override
    public void addCookie(Cookie cookie) {

        if (!included)
            ((HttpServletResponse) getResponse()).addCookie(cookie);

    }


    
Disallow addDateHeader() calls on an included response.

Params:
  • name – The new header name
  • value – The new header value
/**
     * Disallow <code>addDateHeader()</code> calls on an included response.
     *
     * @param name The new header name
     * @param value The new header value
     */
    @Override
    public void addDateHeader(String name, long value) {

        if (!included)
            ((HttpServletResponse) getResponse()).addDateHeader(name, value);

    }


    
Disallow addHeader() calls on an included response.

Params:
  • name – The new header name
  • value – The new header value
/**
     * Disallow <code>addHeader()</code> calls on an included response.
     *
     * @param name The new header name
     * @param value The new header value
     */
    @Override
    public void addHeader(String name, String value) {

        if (!included)
            ((HttpServletResponse) getResponse()).addHeader(name, value);

    }


    
Disallow addIntHeader() calls on an included response.

Params:
  • name – The new header name
  • value – The new header value
/**
     * Disallow <code>addIntHeader()</code> calls on an included response.
     *
     * @param name The new header name
     * @param value The new header value
     */
    @Override
    public void addIntHeader(String name, int value) {

        if (!included)
            ((HttpServletResponse) getResponse()).addIntHeader(name, value);

    }


    
Disallow sendError() calls on an included response.

Params:
  • sc – The new status code
Throws:
/**
     * Disallow <code>sendError()</code> calls on an included response.
     *
     * @param sc The new status code
     *
     * @exception IOException if an input/output error occurs
     */
    @Override
    public void sendError(int sc) throws IOException {

        if (!included)
            ((HttpServletResponse) getResponse()).sendError(sc);

    }


    
Disallow sendError() calls on an included response.

Params:
  • sc – The new status code
  • msg – The new message
Throws:
/**
     * Disallow <code>sendError()</code> calls on an included response.
     *
     * @param sc The new status code
     * @param msg The new message
     *
     * @exception IOException if an input/output error occurs
     */
    @Override
    public void sendError(int sc, String msg) throws IOException {

        if (!included)
            ((HttpServletResponse) getResponse()).sendError(sc, msg);

    }


    
Disallow sendRedirect() calls on an included response.

Params:
  • location – The new location
Throws:
/**
     * Disallow <code>sendRedirect()</code> calls on an included response.
     *
     * @param location The new location
     *
     * @exception IOException if an input/output error occurs
     */
    @Override
    public void sendRedirect(String location) throws IOException {

        if (!included)
            ((HttpServletResponse) getResponse()).sendRedirect(location);

    }


    
Disallow setDateHeader() calls on an included response.

Params:
  • name – The new header name
  • value – The new header value
/**
     * Disallow <code>setDateHeader()</code> calls on an included response.
     *
     * @param name The new header name
     * @param value The new header value
     */
    @Override
    public void setDateHeader(String name, long value) {

        if (!included)
            ((HttpServletResponse) getResponse()).setDateHeader(name, value);

    }


    
Disallow setHeader() calls on an included response.

Params:
  • name – The new header name
  • value – The new header value
/**
     * Disallow <code>setHeader()</code> calls on an included response.
     *
     * @param name The new header name
     * @param value The new header value
     */
    @Override
    public void setHeader(String name, String value) {

        if (!included)
            ((HttpServletResponse) getResponse()).setHeader(name, value);

    }


    
Disallow setIntHeader() calls on an included response.

Params:
  • name – The new header name
  • value – The new header value
/**
     * Disallow <code>setIntHeader()</code> calls on an included response.
     *
     * @param name The new header name
     * @param value The new header value
     */
    @Override
    public void setIntHeader(String name, int value) {

        if (!included)
            ((HttpServletResponse) getResponse()).setIntHeader(name, value);

    }


    
Disallow setStatus() calls on an included response.

Params:
  • sc – The new status code
/**
     * Disallow <code>setStatus()</code> calls on an included response.
     *
     * @param sc The new status code
     */
    @Override
    public void setStatus(int sc) {

        if (!included)
            ((HttpServletResponse) getResponse()).setStatus(sc);

    }


    
Disallow setStatus() calls on an included response.

Params:
  • sc – The new status code
  • msg – The new message
Deprecated:As of version 2.1, due to ambiguous meaning of the message
            parameter. To set a status code use
            setStatus(int), to send an error with a
            description use sendError(int, String).
/**
     * Disallow <code>setStatus()</code> calls on an included response.
     *
     * @param sc The new status code
     * @param msg The new message
     * @deprecated As of version 2.1, due to ambiguous meaning of the message
     *             parameter. To set a status code use
     *             <code>setStatus(int)</code>, to send an error with a
     *             description use <code>sendError(int, String)</code>.
     */
    @Deprecated
    @Override
    public void setStatus(int sc, String msg) {

        if (!included)
            ((HttpServletResponse) getResponse()).setStatus(sc, msg);

    }


    // -------------------------------------------------------- Package Methods

    
Set the included flag for this response.

Params:
  • included – The new included flag
/**
     * Set the included flag for this response.
     *
     * @param included The new included flag
     */
    void setIncluded(boolean included) {

        this.included = included;

    }


    
Set the response that we are wrapping.

Params:
  • response – The new wrapped response
/**
     * Set the response that we are wrapping.
     *
     * @param response The new wrapped response
     */
    void setResponse(HttpServletResponse response) {

        super.setResponse(response);

    }
}