Package cc.mallet.types

Source Code of cc.mallet.types.LabelSequence$Iterator

/* 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 ();
  }



 
}
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