org.jahia.services.applications.StringServletOutputStream.java Source code

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Here is the source code for org.jahia.services.applications.StringServletOutputStream.java

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/**
 * This file is part of Jahia, next-generation open source CMS:
 * Jahia's next-generation, open source CMS stems from a widely acknowledged vision
 * of enterprise application convergence - web, search, document, social and portal -
 * unified by the simplicity of web content management.
 *
 * For more information, please visit http://www.jahia.com.
 *
 * Copyright (C) 2002-2012 Jahia Solutions Group SA. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * As a special exception to the terms and conditions of version 2.0 of
 * the GPL (or any later version), you may redistribute this Program in connection
 * with Free/Libre and Open Source Software ("FLOSS") applications as described
 * in Jahia's FLOSS exception. You should have received a copy of the text
 * describing the FLOSS exception, and it is also available here:
 * http://www.jahia.com/license
 *
 * Commercial and Supported Versions of the program (dual licensing):
 * alternatively, commercial and supported versions of the program may be used
 * in accordance with the terms and conditions contained in a separate
 * written agreement between you and Jahia Solutions Group SA.
 *
 * If you are unsure which license is appropriate for your use,
 * please contact the sales department at sales@jahia.com.
 */

package org.jahia.services.applications;

import javax.servlet.ServletOutputStream;

import org.apache.commons.io.output.ByteArrayOutputStream;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

/**
 * A simple ServletOutputStream based class that writes to a String and
 * simultaneously to an output stream if configured.
 * Note : none of this is supposed to be optimised in anyway, it was done a
 * quick and dirty wayusing mostly already available functions calls to make
 * this reliable.
 *
 * @author : Serge Huber
 * @todo Test this code with Orion, WebLogic, etc... This might be very
 * container-sensitive code.
 */
public class StringServletOutputStream extends ServletOutputStream {

    private ByteArrayOutputStream byteArray = new ByteArrayOutputStream(4096);
    private ServletOutputStream existingStream;
    private String encoding;

    public StringServletOutputStream(String encoding) throws UnsupportedEncodingException {
        super();
        this.encoding = encoding;
    }

    public StringServletOutputStream(ServletOutputStream existingStream, String encoding)
            throws UnsupportedEncodingException {
        this(encoding);
        this.existingStream = existingStream;
    }

    public void write(int c) throws IOException {
        byteArray.write(c);
        if (existingStream != null) {
            existingStream.write(c);
        }
    }

    public String getBuffer() throws UnsupportedEncodingException {
        return byteArray.toString(encoding);
    }

    public void flush() throws IOException {
        if (existingStream != null) {
            existingStream.flush();
        }
    }

    public void close() {
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        byteArray.write(b, off, len);
        if (existingStream != null) {
            existingStream.write(b, off, len);
        }
    }

    @Override
    public void write(byte[] b) throws IOException {
        byteArray.write(b);
        if (existingStream != null) {
            existingStream.write(b);
        }
    }
}