/* 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. */
/**
Add the token text as a feature with value 1.0.
@author Andrew McCallum <a href="mailto:mccallum@cs.umass.edu">mccallum@cs.umass.edu</a>
*/
package cc.mallet.pipe.tsf;
import java.io.*;
import java.util.regex.Pattern;
import cc.mallet.pipe.*;
import cc.mallet.types.*;
public class TokenText extends Pipe implements Serializable
{
String prefix;
Pattern matchingRegex;
public TokenText (String prefix, Pattern matchingRegex)
{
this.prefix = prefix;
this.matchingRegex = matchingRegex;
}
public TokenText (String prefix)
{
this.prefix=prefix;
this.matchingRegex = null;
}
public TokenText ()
{
}
public Instance pipe (Instance carrier)
{
TokenSequence ts = (TokenSequence) carrier.getData();
for (int i = 0; i < ts.size(); i++) {
Token t = ts.get(i);
if (matchingRegex == null || matchingRegex.matcher(t.getText()).matches()) {
t.setFeatureValue (prefix == null ? t.getText() : (prefix+t.getText()), 1.0);
}
}
return carrier;
}
// Serialization
private static final long serialVersionUID = 1;
private static final int CURRENT_SERIAL_VERSION = 1;
private void writeObject (ObjectOutputStream out) throws IOException {
out.writeInt (CURRENT_SERIAL_VERSION);
out.writeObject (prefix);
out.writeObject (matchingRegex);
}
private void readObject (ObjectInputStream in) throws IOException, ClassNotFoundException {
int version = in.readInt ();
prefix = (String) in.readObject ();
if (version > 0)
matchingRegex = (Pattern) in.readObject();
}
}