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Commons Email example source code file (ByteArrayDataSource.java)

This example Commons Email source code file (ByteArrayDataSource.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Email tags/keywords

buffer_size, bufferedinputstream, bufferedoutputstream, bytearraydatasource, bytearraydatasource, bytearrayinputstream, bytearrayoutputstream, bytearrayoutputstream, datasource, encoding, io, ioexception, ioexception, string, string

The Commons Email ByteArrayDataSource.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.commons.mail;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
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 typed DataSource from:<br>
 *
 * - an InputStream<br>
 * - a byte array<br>
 * - a String<br>
 *
 * @since 1.0
 * @author <a href="mailto:colin.chalmers@maxware.nl">Colin Chalmers
 * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens
 * @author <a href="mailto:bmclaugh@algx.net">Brett McLaughlin
 * @version $Id: ByteArrayDataSource.java 782475 2009-06-07 22:02:58Z sgoeschl $
 */
public class ByteArrayDataSource implements DataSource
{
    /** define the buffer size */
    public static final int BUFFER_SIZE = 512;

    /** Stream containg the Data */
    private ByteArrayOutputStream baos;

    /** Content-type. */
    private String type = "application/octet-stream";

    /**
     * Create a datasource from a byte array.
     *
     * @param data A byte[].
     * @param aType A String.
     * @throws IOException IOException
     * @since 1.0
     */
    public ByteArrayDataSource(byte[] data, String aType) throws IOException
    {
        ByteArrayInputStream bis = null;

        try
        {
            bis = new ByteArrayInputStream(data);
            this.byteArrayDataSource(bis, aType);
        }
        finally
        {
            if (bis != null)
            {
                bis.close();
            }
        }
    }

    /**
     * Create a datasource from an input stream.
     *
     * @param aIs An InputStream.
     * @param aType A String.
     * @throws IOException IOException
     * @since 1.0
     */
    public ByteArrayDataSource(InputStream aIs, String aType) throws IOException
    {
        this.byteArrayDataSource(aIs, aType);
    }

    /**
     * Create a datasource from a String.
     *
     * @param data A String.
     * @param aType A String.
     * @throws IOException IOException
     * @since 1.0
     */
    public ByteArrayDataSource(String data, String aType) throws IOException
    {
        this.type = aType;

        try
        {
            baos = new ByteArrayOutputStream();

            // Assumption that the string contains only ASCII
            // characters!  Else just pass in a charset into this
            // constructor and use it in getBytes().
            baos.write(data.getBytes("iso-8859-1"));
            baos.flush();
            baos.close();
        }
        catch (UnsupportedEncodingException uex)
        {
            throw new IOException("The Character Encoding is not supported.");
        }
        finally
        {
            if (baos != null)
            {
                baos.close();
            }
        }
    }

    /**
      * Create a datasource from an input stream.
      *
      * @param aIs An InputStream.
      * @param aType A String.
      * @throws IOException IOException
      */
    private void byteArrayDataSource(InputStream aIs, String aType)
        throws IOException
    {
        this.type = aType;

        BufferedInputStream bis = null;
        BufferedOutputStream osWriter = null;

        try
        {
            int length = 0;
            byte[] buffer = new byte[ByteArrayDataSource.BUFFER_SIZE];

            bis = new BufferedInputStream(aIs);
            baos = new ByteArrayOutputStream();
            osWriter = new BufferedOutputStream(baos);

            //Write the InputData to OutputStream
            while ((length = bis.read(buffer)) != -1)
            {
                osWriter.write(buffer, 0, length);
            }
            osWriter.flush();
            osWriter.close();

        }
        finally
        {
            if (bis != null)
            {
                bis.close();
            }
            if (baos != null)
            {
                baos.close();
            }
            if (osWriter != null)
            {
                osWriter.close();
            }
        }
    }



    /**
     * Get the content type.
     *
     * @return A String.
     * @since 1.0
     */
    public String getContentType()
    {
        return type == null ? "application/octet-stream" : type;
    }

    /**
     * Get the input stream.
     *
     * @return An InputStream.
     * @throws IOException IOException
     * @since 1.0
     */
    public InputStream getInputStream() throws IOException
    {
        if (baos == null)
        {
            throw new IOException("no data");
        }
        return new ByteArrayInputStream(baos.toByteArray());
    }

    /**
     * Get the name.
     *
     * @return A String.
     * @since 1.0
     */
    public String getName()
    {
        return "ByteArrayDataSource";
    }

    /**
     * Get the OutputStream to write to
     *
     * @return  An OutputStream
     * @since 1.0
     */
    public OutputStream getOutputStream()
    {
        baos = new ByteArrayOutputStream();
        return baos;
    }
}

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