chalk.tools.sentdetect.lang.th.SentenceContextGenerator Maven / Gradle / Ivy

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/*
 * 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 chalk.tools.sentdetect.lang.th;

import chalk.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())));
  }
}