/* 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. */
/**
@author Andrew McCallum <a href="mailto:mccallum@cs.umass.edu">mccallum@cs.umass.edu</a>
*/
package cc.mallet.types;
import java.io.*;
import cc.mallet.types.FeatureVectorSequence.Iterator;
public class LabelSequence extends FeatureSequence implements AlphabetCarrying, Serializable
{
public LabelSequence (LabelAlphabet dict, int[] features)
{
super (dict, features);
}
public LabelSequence (LabelAlphabet dict, int capacity)
{
super (dict, capacity);
}
private static int[] getFeaturesFromLabels (Label[] labels)
{
int[] features = new int[labels.length];
for (int i = 0; i < labels.length; i++)
features[i] = labels[i].getIndex();
return features;
}
public LabelSequence (Label[] labels)
{
super (labels[0].getLabelAlphabet(), getFeaturesFromLabels (labels));
}
public LabelSequence (Alphabet dict)
{
super (dict);
}
public LabelAlphabet getLabelAlphabet () { return (LabelAlphabet) dictionary; }
public Label getLabelAtPosition (int pos)
{
return ((LabelAlphabet)dictionary).lookupLabel (features[pos]);
}
public class Iterator implements java.util.Iterator {
int pos;
public Iterator () {
pos = 0;
}
public Object next() {
return getLabelAtPosition(pos++);
}
public int getIndex () {
return pos;
}
public boolean hasNext() {
return pos < features.length;
}
public void remove () {
throw new UnsupportedOperationException ();
}
}
public Iterator iterator ()
{
return new Iterator();
}
// ???
//public Object get (int pos) { return getLabelAtPosition (pos); }
// 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 ();
}
}