/* 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.types.Instance;
import cc.mallet.types.Token;
import cc.mallet.types.TokenSequence;
/**
* Replace the data string with a lowercased version.
* This can improve performance over TokenSequenceLowercase.
*/
public class CharSequenceLowercase extends Pipe implements Serializable {
public Instance pipe (Instance carrier) {
if (carrier.getData() instanceof String) {
String data = (String) carrier.getData();
carrier.setData(data.toLowerCase());
}
else {
throw new IllegalArgumentException("CharSequenceLowercase expects a String, found a " + carrier.getData().getClass());
}
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 ();
}
}