coyoteresponsefacade.java

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/*
 * $Header: /home/cvs/jakarta-tomcat-catalina/catalina/src/share/org/apache/coyote/tomcat5/CoyoteResponseFacade.java,v 1.3 2004/01/07 05:06:47 billbarker Exp $
 * $Revision: 1.3 $
 * $Date: 2004/01/07 05:06:47 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */


package org.apache.coyote.tomcat5;

import java.io.IOException;
import java.io.PrintWriter;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Locale;

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

import org.apache.catalina.connector.ResponseFacade;

/**
 * Facade class that wraps a Coyote response object. 
 * All methods are delegated to the wrapped response.
 *
 * @author Remy Maucherat
 * @author Jean-Francois Arcand
 * @version $Revision: 1.3 $ $Date: 2004/01/07 05:06:47 $
 */


public class CoyoteResponseFacade 
    extends ResponseFacade
    implements HttpServletResponse {

    // ----------------------------------------------------------- DoPrivileged
    
    private final class SetContentTypePrivilegedAction implements PrivilegedAction{
        private String contentType;
        public SetContentTypePrivilegedAction(String contentType){
            this.contentType = contentType;
        }
        
        public Object run() {
            response.setContentType(contentType);
            return null;
        }            
    }

    private final class DateHeaderPrivilegedAction implements PrivilegedAction {
        private String name;
        private long value;
        private boolean add;

        DateHeaderPrivilegedAction(String name, long value, boolean add) {
            this.name = name;
            this.value = value;
            this.add = add;
        }

        public Object run() {
            if(add) {
                response.addDateHeader(name, value);
            } else {
                response.setDateHeader(name, value);
            }
            return null;
        }
    }
    
    // ----------------------------------------------------------- Constructors


    /**
     * Construct a wrapper for the specified response.
     *
     * @param response The response to be wrapped
     */
    public CoyoteResponseFacade(CoyoteResponse response) {

        super(response);
        this.response = response;

    }


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


    /**
     * The wrapped response.
     */
    protected CoyoteResponse response = null;


    // --------------------------------------------------------- Public Methods


    /**
     * Clear facade.
     */
    public void clear() {
        response = null;
    }


    public void finish() {

        response.setSuspended(true);

    }


    public boolean isFinished() {

        return response.isSuspended();

    }


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


    public String getCharacterEncoding() {
        return response.getCharacterEncoding();
    }


    public ServletOutputStream getOutputStream()
        throws IOException {

        //        if (isFinished())
        //            throw new IllegalStateException
        //                (/*sm.getString("responseFacade.finished")*/);

        ServletOutputStream sos = response.getOutputStream();
        if (isFinished())
            response.setSuspended(true);
        return (sos);

    }


    public PrintWriter getWriter()
        throws IOException {

        //        if (isFinished())
        //            throw new IllegalStateException
        //                (/*sm.getString("responseFacade.finished")*/);

        PrintWriter writer = response.getWriter();
        if (isFinished())
            response.setSuspended(true);
        return (writer);

    }


    public void setContentLength(int len) {

        if (isCommitted())
            return;

        response.setContentLength(len);

    }


    public void setContentType(String type) {

        if (isCommitted())
            return;
        
        if (System.getSecurityManager() != null){
            AccessController.doPrivileged(new SetContentTypePrivilegedAction(type));
        } else {
            response.setContentType(type);            
        }
    }


    public void setBufferSize(int size) {

        if (isCommitted())
            throw new IllegalStateException
                (/*sm.getString("responseBase.reset.ise")*/);

        response.setBufferSize(size);

    }


    public int getBufferSize() {
        return response.getBufferSize();
    }


    public void flushBuffer()
        throws IOException {

        if (isFinished())
            //            throw new IllegalStateException
            //                (/*sm.getString("responseFacade.finished")*/);
            return;

        if (System.getSecurityManager() != null){
            try{
                AccessController.doPrivileged(new PrivilegedExceptionAction(){

                    public Object run() throws IOException{
                        response.setAppCommitted(true);

                        response.flushBuffer();
                        return null;
                    }
                });
            } catch(PrivilegedActionException e){
                Exception ex = e.getException();
                if (ex instanceof IOException){
                    throw (IOException)ex;
                }
            }
        } else {
            response.setAppCommitted(true);

            response.flushBuffer();            
        }

    }


    public void resetBuffer() {

        if (isCommitted())
            throw new IllegalStateException
                (/*sm.getString("responseBase.reset.ise")*/);

        response.resetBuffer();

    }


    public boolean isCommitted() {
        return (response.isAppCommitted());
    }


    public void reset() {

        if (isCommitted())
            throw new IllegalStateException
                (/*sm.getString("responseBase.reset.ise")*/);

        response.reset();

    }


    public void setLocale(Locale loc) {

        if (isCommitted())
            return;

        response.setLocale(loc);
    }


    public Locale getLocale() {
        return response.getLocale();
    }


    public void addCookie(Cookie cookie) {

        if (isCommitted())
            return;

        response.addCookie(cookie);

    }


    public boolean containsHeader(String name) {
        return response.containsHeader(name);
    }


    public String encodeURL(String url) {
        return response.encodeURL(url);
    }


    public String encodeRedirectURL(String url) {
        return response.encodeRedirectURL(url);
    }


    public String encodeUrl(String url) {
        return response.encodeURL(url);
    }


    public String encodeRedirectUrl(String url) {
        return response.encodeRedirectURL(url);
    }


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

        if (isCommitted())
            throw new IllegalStateException
                (/*sm.getString("responseBase.reset.ise")*/);

        response.setAppCommitted(true);

        response.sendError(sc, msg);

    }


    public void sendError(int sc)
        throws IOException {

        if (isCommitted())
            throw new IllegalStateException
                (/*sm.getString("responseBase.reset.ise")*/);

        response.setAppCommitted(true);

        response.sendError(sc);

    }


    public void sendRedirect(String location)
        throws IOException {

        if (isCommitted())
            throw new IllegalStateException
                (/*sm.getString("responseBase.reset.ise")*/);

        response.setAppCommitted(true);

        response.sendRedirect(location);

    }


    public void setDateHeader(String name, long date) {

        if (isCommitted())
            return;

        if(System.getSecurityManager() != null) {
            AccessController.doPrivileged(new DateHeaderPrivilegedAction
                                             (name, date, false));
        } else {
            response.setDateHeader(name, date);
        }

    }


    public void addDateHeader(String name, long date) {

        if (isCommitted())
            return;

        if(System.getSecurityManager() != null) {
            AccessController.doPrivileged(new DateHeaderPrivilegedAction
                                             (name, date, true));
        } else {
            response.addDateHeader(name, date);
        }

    }


    public void setHeader(String name, String value) {

        if (isCommitted())
            return;

        response.setHeader(name, value);

    }


    public void addHeader(String name, String value) {

        if (isCommitted())
            return;

        response.addHeader(name, value);

    }


    public void setIntHeader(String name, int value) {

        if (isCommitted())
            return;

        response.setIntHeader(name, value);

    }


    public void addIntHeader(String name, int value) {

        if (isCommitted())
            return;

        response.addIntHeader(name, value);

    }


    public void setStatus(int sc) {

        if (isCommitted())
            return;

        response.setStatus(sc);

    }


    public void setStatus(int sc, String sm) {

        if (isCommitted())
            return;

        response.setStatus(sc, sm);

    }


}