/*
Copyright (C) 2012 Nguyen Viet Cuong, Ye Nan, Sumit Bhagwani

This file is part of HOSemiCRF.

HOSemiCRF is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

HOSemiCRF is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with HOSemiCRF. If not, see <http://www.gnu.org/licenses/>.
*/

package Applications.PuncFeatures;

import java.util.*;
import HOSemiCRF.*;

/**
 * Edge and previous word features within a segment
 * @author Nguyen Viet Cuong
 */
public class EdgePreviousWordBag extends FeatureType {
	
    public ArrayList<String> generateObsAt(DataSequence seq, int segStart, int segEnd) {
        ArrayList<String> obs = new ArrayList<String>();
        for (int i = segStart + 1; i <= segEnd; i++) {
            obs.add("EPWB." + seq.x(i - 1));
        }
        return obs;
    }
	
    public int order() {
        return 0;
    }
}

package Applications.PuncFeatures;

import java.util.*;
import HOSemiCRF.*;

/**
 * Edge and previous word features within a segment
 * @author Nguyen Viet Cuong
 */
public class EdgePreviousWordBag extends FeatureType {
	
    public ArrayList<String> generateObsAt(DataSequence seq, int segStart, int segEnd) {
        ArrayList<String> obs = new ArrayList<String>();
        for (int i = segStart + 1; i <= segEnd; i++) {
            obs.add("EPWB." + seq.x(i - 1));
        }
        return obs;
    }
	
    public int order() {
        return 0;
    }
}

Update EdgePreviousWordBag.java