Glassfish example source code file (ResponseIncludeWrapper.java)

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Java - Glassfish tags/keywords

http, httpservletrequest, httpservletresponse, illegalstateexception, io, printwriter, printwriter, request, response, responseincludewrapper, servlet, servletoutputstream, servletoutputstream, simpledateformat, simpledateformat, string, string, threadlocal, throwable, util

The Glassfish ResponseIncludeWrapper.java source code

/*
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 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
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 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * 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 org.apache.catalina.ssi;

import javax.servlet.ServletContext;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.TimeZone;

/**
 * A HttpServletResponseWrapper, used from
 * <code>SSIServletExternalResolver
 * 
 * @author Bip Thelin
 * @author David Becker
 * @version $Revision: 1.3 $, $Date: 2007/02/13 19:16:20 $
 */
public class ResponseIncludeWrapper extends HttpServletResponseWrapper {
    /**
     * The names of some headers we want to capture.
     */
    private static final String CONTENT_TYPE = "content-type";
    private static final String LAST_MODIFIED = "last-modified";
    private static final String RFC1123_PATTERN = "EEE, dd MMM yyyy HH:mm:ss z";

    private static final ThreadLocal<SimpleDateFormat> RFC1123_FORMAT =
        new ThreadLocal<SimpleDateFormat>() {
            @Override
            protected SimpleDateFormat initialValue() {
                // rfc 1123 pattern format
                SimpleDateFormat f = new SimpleDateFormat(RFC1123_PATTERN, Locale.US);
                f.setTimeZone(TimeZone.getTimeZone("GMT"));
                return f;
            }
        };

    private SimpleDateFormat rfc1123Format;
    protected long lastModified = -1;
    private String contentType = null;

    /**
     * Our ServletOutputStream
     */
    protected ServletOutputStream captureServletOutputStream;
    protected ServletOutputStream servletOutputStream;
    protected PrintWriter printWriter;
    
    private ServletContext context;
    private HttpServletRequest request;


    /**
     * Initialize our wrapper with the current HttpServletResponse and
     * ServletOutputStream.
     * 
     * @param context The servlet context
     * @param request The HttpServletResponse to use
     * @param response The response to use
     * @param captureServletOutputStream The ServletOutputStream to use
     */
    public ResponseIncludeWrapper(ServletContext context, 
    		HttpServletRequest request, HttpServletResponse response,
           ServletOutputStream captureServletOutputStream) {
        super(response);
        this.context = context;
        this.request = request;
        this.captureServletOutputStream = captureServletOutputStream;
        this.rfc1123Format = RFC1123_FORMAT.get();
    }


    /**
     * Flush the servletOutputStream or printWriter ( only one will be non-null )
     * This must be called after a requestDispatcher.include, since we can't
     * assume that the included servlet flushed its stream.
     */
    public void flushOutputStreamOrWriter() throws IOException {
        if (servletOutputStream != null) {
            servletOutputStream.flush();
        }
        if (printWriter != null) {
            printWriter.flush();
        }
    }


    /**
     * Return a printwriter, throws and exception if a OutputStream already
     * been returned.
     * 
     * @return a PrintWriter object
     * @exception java.io.IOException
     *                if the outputstream already been called
     */
    public PrintWriter getWriter() throws java.io.IOException {
        if (servletOutputStream == null) {
            if (printWriter == null) {
                setCharacterEncoding(getCharacterEncoding());
                printWriter = new PrintWriter(
                        new OutputStreamWriter(captureServletOutputStream,
                                               getCharacterEncoding()));
            }
            return printWriter;
        }
        throw new IllegalStateException();
    }


    /**
     * Return a OutputStream, throws and exception if a printwriter already
     * been returned.
     * 
     * @return a OutputStream object
     * @exception java.io.IOException
     *                if the printwriter already been called
     */
    public ServletOutputStream getOutputStream() throws java.io.IOException {
        if (printWriter == null) {
            if (servletOutputStream == null) {
                servletOutputStream = captureServletOutputStream;
            }
            return servletOutputStream;
        }
        throw new IllegalStateException();
    }
    
    
    /**
     * Returns the value of the <code>last-modified header field. The
     * result is the number of milliseconds since January 1, 1970 GMT.
     *
     * @return the date the resource referenced by this
     *   <code>ResponseIncludeWrapper was last modified, or -1 if not
     *   known.                                                             
     */
    public long getLastModified() {                                                                                                                                                           
        if (lastModified == -1) {
            // javadocs say to return -1 if date not known, if you want another
            // default, put it here
            return -1;
        }
        return lastModified;
    }

    /**
     * Sets the value of the <code>last-modified header field.
     *
     * @param lastModified The number of milliseconds since January 1, 1970 GMT.
     */
    public void setLastModified(long lastModified) {
        this.lastModified = lastModified;
        ((HttpServletResponse) getResponse()).setDateHeader(LAST_MODIFIED,
                lastModified);
    }

    /**
     * Returns the value of the <code>content-type header field.
     *
     * @return the content type of the resource referenced by this
     *   <code>ResponseIncludeWrapper, or null if not known.
     */
    public String getContentType() {
        if (contentType == null) {
            String url = request.getRequestURI();
            String mime = context.getMimeType(url);
            if (mime != null)
            {
                setContentType(mime);
            }
            else
            {
            	// return a safe value
               setContentType("application/x-octet-stream");
            }
        }
        return contentType;
    }
    
    /**
     * Sets the value of the <code>content-type header field.
     *
     * @param mime a mime type
     */
    public void setContentType(String mime) {
        contentType = mime;
        if (contentType != null) {
            getResponse().setContentType(contentType);
        }
    }


    public void addDateHeader(String name, long value) {
        super.addDateHeader(name, value);
        String lname = name.toLowerCase(Locale.ENGLISH);
        if (lname.equals(LAST_MODIFIED)) {
            lastModified = value;
        }
    }

    public void addHeader(String name, String value) {
        super.addHeader(name, value);
        String lname = name.toLowerCase(Locale.ENGLISH);
        if (lname.equals(LAST_MODIFIED)) {
            try {
                lastModified = rfc1123Format.parse(value).getTime();
            } catch (Throwable ignore) { }
        } else if (lname.equals(CONTENT_TYPE)) {
            contentType = value;
        }
    }

    public void setDateHeader(String name, long value) {
        super.setDateHeader(name, value);
        String lname = name.toLowerCase(Locale.ENGLISH);
        if (lname.equals(LAST_MODIFIED)) {
            lastModified = value;
        }
    }

    public void setHeader(String name, String value) {
        super.setHeader(name, value);
        String lname = name.toLowerCase(Locale.ENGLISH);
        if (lname.equals(LAST_MODIFIED)) {
            try {
                lastModified = rfc1123Format.parse(value).getTime();
            } catch (Throwable ignore) { }
        }
        else if (lname.equals(CONTENT_TYPE))
        {
            contentType = value;
        }
    }
}