cmsbytearraydatasource.java

内容管理

/*
* File   : $Source: /usr/local/cvs/opencms/src/com/opencms/util/CmsByteArrayDataSource.java,v $
* Date   : $Date: 2003/02/08 15:32:14 $
* Version: $Revision: 1.3 $
*
* This library is part of OpenCms -
* the Open Source Content Mananagement System
*
* Copyright (C) 2001  The OpenCms Group
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* For further information about OpenCms, please see the
* OpenCms Website: http://www.opencms.org 
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

package com.opencms.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

import javax.activation.DataSource;

/** 
 * This class implements a DataSource from an InputStream, a byte array or a 
 * String and is most often used to create a mail message with the CmsMail object.<p>
 * 
 * @author $Author: a.kandzior $
 * 
 * @version $Revision: 1.3 $ $Date: 2003/02/08 15:32:14 $
 * 
 * @see com.opencms.defaults.CmsMail
 * @see <a href="http://java.sun.com/products/javamail/index.html">http://java.sun.com/products/javamail/index.html</a>
 */
public class CmsByteArrayDataSource implements DataSource {
    private byte[] data; // data
    private String type; // content-type
    
    /* Create a DataSource from a byte array */
    public CmsByteArrayDataSource(byte[] data, String type) {
        this.data = data;
        this.type = type;
    }
    
    /* Create a DataSource from an input stream */
    public CmsByteArrayDataSource(InputStream is, String type) {
        this.type = type;
        try {
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            int ch;
            while((ch = is.read()) != -1) {
                
                // XXX - must be made more efficient by                
                // doing buffered reads, rather than one byte reads
                os.write(ch);
            }
            data = os.toByteArray();
        }
        catch(IOException ioex) {
            
        }
    }
    
    /* Create a DataSource from a String */
    public CmsByteArrayDataSource(String data, String type, String encoding) {
        try {
            
            // Assumption that the string contains only ASCII            
            // characters!  Otherwise just pass a charset into this            
            // constructor and use it in getBytes()
            this.data = data.getBytes(encoding);
        }
        catch(UnsupportedEncodingException uex) {
            this.data = data.getBytes();
        }
        this.type = type;
    }
    public String getContentType() {
        return type;
    }
    
    /**
     * Return an InputStream for the data.
     * Note - a new stream must be returned each time.
     */
    public InputStream getInputStream() throws IOException {
        if(data == null) {
            throw new IOException("no data");
        }
        return new ByteArrayInputStream(data);
    }
    public String getName() {
        return "dummy";
    }
    public OutputStream getOutputStream() throws IOException {
        throw new IOException("cannot do this");
    }
}