MultiPartOutputStream.java

package org.zkoss.zats.common.util;

// ========================================================================
// Copyright (c) 1996-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at 
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses. 
// ========================================================================


import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;


/* ================================================================ */
/** Handle a multipart MIME response.
 *
 * 
 * 
*/
public class MultiPartOutputStream extends FilterOutputStream
{
    /* ------------------------------------------------------------ */
    private static byte[] __CRLF;
    private static byte[] __DASHDASH;
    private static String __ISO_8859_1 = "ISO-8859-1";
    
    public static String MULTIPART_MIXED="multipart/mixed";
    public static String MULTIPART_X_MIXED_REPLACE="multipart/x-mixed-replace";
    static
    {
        try
        {
            __CRLF="\015\012".getBytes(__ISO_8859_1);
            __DASHDASH="--".getBytes(__ISO_8859_1);
        }
        catch (Exception e) {e.printStackTrace(); System.exit(1);}
    }
    
    /* ------------------------------------------------------------ */
    private String boundary;
    private byte[] boundaryBytes;

    /* ------------------------------------------------------------ */
    private boolean inPart=false;    
    
    /* ------------------------------------------------------------ */
    public MultiPartOutputStream(OutputStream out, String boundary)
    throws IOException
    {
        super(out);

		this.boundary = boundary;
		boundaryBytes = boundary.getBytes(__ISO_8859_1);

        inPart=false;
    }

    /* ------------------------------------------------------------ */
    /** End the current part.
     * @exception IOException IOException
     */
    @Override
    public void close()
         throws IOException
    {
        if (inPart)
            out.write(__CRLF);
        out.write(__DASHDASH);
        out.write(boundaryBytes);
        out.write(__DASHDASH);
        out.write(__CRLF);
        inPart=false;
        super.close();
    }
    
    /* ------------------------------------------------------------ */
    public String getBoundary()
    {
        return boundary;
    }

    public OutputStream getOut() {return out;}
    
    /* ------------------------------------------------------------ */
    /** Start creation of the next Content.
     */
    public void startPart(String contentType)
         throws IOException
    {
        if (inPart)
            out.write(__CRLF);
        inPart=true;
        out.write(__DASHDASH);
        out.write(boundaryBytes);
        out.write(__CRLF);
        out.write(("Content-Type: "+contentType).getBytes(__ISO_8859_1));
        out.write(__CRLF);
        out.write(__CRLF);
    }
        
    /* ------------------------------------------------------------ */
    /** Start creation of the next Content.
     */
    public void startPart(String contentType, String[] headers)
         throws IOException
    {
        if (inPart)
            out.write(__CRLF);
        inPart=true;
        out.write(__DASHDASH);
        out.write(boundaryBytes);
        out.write(__CRLF);
        out.write(("Content-Type: "+contentType).getBytes(__ISO_8859_1));
        out.write(__CRLF);
        for (int i=0;headers!=null && i<headers.length;i++)
        {
            out.write(headers[i].getBytes(__ISO_8859_1));
            out.write(__CRLF);
        }
        out.write(__CRLF);
    }
    
}