container/catalina/src/share/org/apache/catalina/core/ApplicationHttpResponse.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 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;

import org.apache.catalina.util.StringManager;


/**
 * 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
 * @version $Revision$ $Date$
 */

class ApplicationHttpResponse extends HttpServletResponseWrapper {


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


    /**
     * Construct a new wrapped response around the specified servlet response.
     *
     * @param response The servlet response being wrapped
     */
    public ApplicationHttpResponse(HttpServletResponse response) {

        this(response, false);

    }


    /**
     * 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 <code>include()</code>
     * call?
     */
    protected boolean included = false;


    /**
     * Descriptive information about this implementation.
     */
    protected static final String info =
        "org.apache.catalina.core.ApplicationHttpResponse/1.0";


    /**
     * The string manager for this package.
     */
    protected static StringManager sm =
        StringManager.getManager(Constants.Package);


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


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

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

    }


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

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

    }


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

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

    }


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

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

    }


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


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


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

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

    }


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

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

    }


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

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

    }


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

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

    }


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

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

    }


    /**
     * 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
     */
    public void sendError(int sc, String msg) throws IOException {

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

    }


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

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

    }


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

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

    }


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

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

    }


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

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

    }


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

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

    }


    /**
     * Disallow <code>setStatus()</code> calls on an included response.
     *
     * @param sc The new status code
     * @param msg The new message
     */
    public void setStatus(int sc, String msg) {

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

    }


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


    /**
     * Return descriptive information about this implementation.
     */
    public String getInfo() {

        return (info);

    }


    /**
     * Return the included flag for this response.
     */
    boolean isIncluded() {

        return (this.included);

    }


    /**
     * 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.
     *
     * @param response The new wrapped response
     */
    void setResponse(HttpServletResponse response) {

        super.setResponse(response);

    }


}