opennlp.tools.util.featuregen.SentenceFeatureGenerator 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.util.featuregen;
import java.util.List;
/**
* This feature generator creates sentence begin and end features.
*/
public class SentenceFeatureGenerator implements AdaptiveFeatureGenerator {
private final boolean isGenerateFirstWordFeature;
private final boolean isGenerateLastWordFeature;
public SentenceFeatureGenerator(boolean isGenerateFirstWordFeature,
boolean isGenerateLastWordFeature) {
this.isGenerateFirstWordFeature = isGenerateFirstWordFeature;
this.isGenerateLastWordFeature = isGenerateLastWordFeature;
}
public void createFeatures(List features, String[] tokens, int index,
String[] previousOutcomes) {
if (isGenerateFirstWordFeature && index == 0) {
features.add("S=begin");
}
if (isGenerateLastWordFeature && tokens.length == index + 1) {
features.add("S=end");
}
}
}