///////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2007 University of Texas at Austin and (C) 2005
// University of Pennsylvania and Copyright (C) 2002, 2003 University
// of Massachusetts Amherst, Department of Computer Science.
//
// This software is licensed under the terms of the Common Public
// License, Version 1.0 or (at your option) any subsequent version.
// 
// The license is approved by the Open Source Initiative, and is
// available from their website at http://www.opensource.org.
///////////////////////////////////////////////////////////////////////////////
package mstparser;

import gnu.trove.TLinkableAdaptor;

/**
 * A simple class holding a feature index and value that can be used in a
 * TLinkedList.
 *
 * <p> Created: Sat Nov 10 15:25:10 2001 </p>
 *
 * @author Jason Baldridge
 * @version $Id: TLinkedList.java,v 1.5 2005/03/26 17:52:56 ericdf Exp $
 * @see mstparser.FeatureVector
 */
public final class Feature extends TLinkableAdaptor {

    public int index;
    public double value;

    public Feature(int i, double v) {
        index = i;
        value = v;
    }

    @Override
    public final Feature clone() {
        return new Feature(index, value);
    }

    public final Feature negation() {
        return new Feature(index, -value);
    }

    @Override
    public final String toString() {
        return index + "=" + value;
    }
}