opennlp.tools.sentdetect.lang.th.SentenceContextGenerator Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 opennlp.tools.sentdetect.lang.th;
import opennlp.tools.sentdetect.DefaultSDContextGenerator;
/**
* Creates contexts/features for end-of-sentence detection in Thai text.
*/
public class SentenceContextGenerator extends DefaultSDContextGenerator {
public static final char[] eosCharacters = {' ','\n'};
public SentenceContextGenerator() {
super(eosCharacters);
}
@Override
protected void collectFeatures(String prefix, String suffix, String previous, String next) {
buf.append("p=");
buf.append(prefix);
collectFeats.add(buf.toString());
buf.setLength(0);
buf.append("s=");
buf.append(suffix);
collectFeats.add(buf.toString());
buf.setLength(0);
collectFeats.add("p1=" + prefix.substring(Math.max(prefix.length() - 1,0)));
collectFeats.add("p2=" + prefix.substring(Math.max(prefix.length() - 2,0)));
collectFeats.add("p3=" + prefix.substring(Math.max(prefix.length() - 3,0)));
collectFeats.add("p4=" + prefix.substring(Math.max(prefix.length() - 4,0)));
collectFeats.add("p5=" + prefix.substring(Math.max(prefix.length() - 5,0)));
collectFeats.add("p6=" + prefix.substring(Math.max(prefix.length() - 6,0)));
collectFeats.add("p7=" + prefix.substring(Math.max(prefix.length() - 7,0)));
collectFeats.add("n1=" + suffix.substring(0,Math.min(1, suffix.length())));
collectFeats.add("n2=" + suffix.substring(0,Math.min(2, suffix.length())));
collectFeats.add("n3=" + suffix.substring(0,Math.min(3, suffix.length())));
collectFeats.add("n4=" + suffix.substring(0,Math.min(4, suffix.length())));
collectFeats.add("n5=" + suffix.substring(0,Math.min(5, suffix.length())));
collectFeats.add("n6=" + suffix.substring(0,Math.min(6, suffix.length())));
collectFeats.add("n7=" + suffix.substring(0,Math.min(7, suffix.length())));
}
}