PrintInput.java

/* Copyright (C) 2002 Univ. of Massachusetts Amherst, Computer Science Dept.
   This file is part of "MALLET" (MAchine Learning for LanguagE Toolkit).
   http://www.cs.umass.edu/~mccallum/mallet
   This software is provided under the terms of the Common Public License,
   version 1.0, as published by http://www.opensource.org.  For further
   information, see the file `LICENSE' included with this distribution. */





package cc.mallet.pipe;

import java.io.*;

import cc.mallet.pipe.Pipe;
import cc.mallet.types.Instance;
/**
 * Print the data field of each instance.
   @author Andrew McCallum <a href="mailto:mccallum@cs.umass.edu">mccallum@cs.umass.edu</a>
 */

public class PrintInput extends Pipe implements Serializable
{
	String prefix = null;
	PrintStream stream = System.out;

	public PrintInput (String prefix)
	{
		this.prefix = prefix;
	}

	public PrintInput ()
	{
	}

	public PrintInput (PrintStream out) {
		stream = out;
	}

	public PrintInput(String prefix, PrintStream out) {
		this.prefix = prefix;
		stream = out;
	}
	
	public Instance pipe (Instance carrier)
	{
		if (prefix != null)
			stream.print (prefix);
		stream.println (carrier.getData().toString());
		return carrier;
	}

	// Serialization 
	
	private static final long serialVersionUID = 1;
	private static final int CURRENT_SERIAL_VERSION = 0;
	
	private void writeObject (ObjectOutputStream out) throws IOException {
		out.writeInt (CURRENT_SERIAL_VERSION);
	}
	
	private void readObject (ObjectInputStream in) throws IOException, ClassNotFoundException {
		int version = in.readInt ();
		prefix = null;
		stream = System.out;
	}

}