ContextualizerUtils.java

/*
 * Copyright 2014
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universität Darmstadt
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.tudarmstadt.ukp.dkpro.core.jazzy.util;

import java.util.ArrayList;
import java.util.List;

import org.apache.uima.jcas.tcas.Annotation;

import de.tudarmstadt.ukp.dkpro.core.api.segmentation.type.Token;

// NOTE: these utils were copied from DKPro Spelling as I don't want to make core dependent on it
public class ContextualizerUtils
{
    public static int getCandidatePosition(Annotation candidate, List<Token> tokens)
    {
        int position = -1;
        
        for (int i=0; i<tokens.size(); i++) {
            if (tokens.get(i).getBegin() == candidate.getBegin() &&
                tokens.get(i).getEnd()   == candidate.getEnd())
            {
                position = i;
            }
        }

        return position;
    }

    public static List<String> getChangedWords(String edit, List<String> words, int offset) {
        List<String> changedWords = new ArrayList<String>(words);
        changedWords.set(offset, edit);
            
        return changedWords;
    }

    public static List<String> limitToContextWindow(List<String> words, int offset, int windowSize) {
        int minOffset = offset - windowSize;
        if (minOffset < 0) {
            minOffset = 0;
        }
        
        int maxOffset = offset + windowSize;
        if (maxOffset >= words.size()) {
            maxOffset = words.size()-1;
        }
        
        List<String> changedWords = words.subList(minOffset, maxOffset+1);
            
        return changedWords;
    }

    public static String getTrigram(String s1, String s2, String s3) {
        StringBuilder sb = new StringBuilder();
        sb.append(s1);
        sb.append(" ");
        sb.append(s2);
        sb.append(" ");
        sb.append(s3);
        return sb.toString();
    }
}