001/*
002 *                    BioJava development code
003 *
004 * This code may be freely distributed and modified under the
005 * terms of the GNU Lesser General Public Licence.  This should
006 * be distributed with the code.  If you do not have a copy,
007 * see:
008 *
009 *      http://www.gnu.org/copyleft/lesser.html
010 *
011 * Copyright for this code is held jointly by the individual
012 * authors.  These should be listed in @author doc comments.
013 *
014 * For more information on the BioJava project and its aims,
015 * or to join the biojava-l mailing list, visit the home page
016 * at:
017 *
018 *      http://www.biojava.org/
019 *
020 */
021
022/*
023 *    WriterOutputHandler.java
024 */
025package org.biojava.utils.process;
026
027import java.io.InputStream;
028import java.io.InputStreamReader;
029import java.io.Writer;
030
031
032/**
033 * Simple {@linkplain org.biojava.utils.process.OutputHandler output handler} 
034 * that writes the output of an external process to an 
035 * {@linkplain org.biojava.utils.process.ReaderWriterPipe#getWriter() writer}.
036 * @author <a href="mailto:Martin.Szugat@GMX.net">Martin Szugat</a>
037 * @version $Revision$
038 */
039public class WriterOutputHandler extends ReaderWriterPipe 
040implements OutputHandler {
041    
042    /* PRIVATE FIELDS */
043
044    /**
045     * The input stream for the external process.
046     */
047    private InputStream input;
048
049    /**
050     * Initializes the writer output handler.
051     * @param writer the writer to which to write the output of the external
052     * process. May be <code>null</code>.
053     * @param tag a tag for logging. May be <code>null</code>.
054     */
055    public WriterOutputHandler(Writer writer, String tag) {
056        super(null, writer, tag);
057    }
058    
059    /* INTERFACE OutputHandler */
060
061    /**
062     * {@inheritDoc}
063     */
064    public void setInput(InputStream input) {
065        this.input = input;
066        if (input != null) {
067            setReader(new InputStreamReader(input));
068        }
069    }
070
071    /**
072     * {@inheritDoc}
073     */
074    public InputStream getInput() {
075        return input;
076    }
077
078}