/*
* 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;
import java.util.Objects;
import opennlp.tools.postag.POSModel;
import opennlp.tools.postag.POSTagger;
import opennlp.tools.postag.POSTaggerME;
/**
* Adds the token POS Tag as feature. Requires a POS Tag model.
*/
public class POSTaggerNameFeatureGenerator implements AdaptiveFeatureGenerator {
private POSTagger posTagger;
private String[] cachedTokens;
private String[] cachedTags;
/**
* Initializes a new instance.
*
* @param aPosTagger a POSTagger implementation.
*/
public POSTaggerNameFeatureGenerator(POSTagger aPosTagger) {
this.posTagger = aPosTagger;
}
/**
* Initializes a new instance.
*
* @param aPosModel a POSTagger model.
*/
public POSTaggerNameFeatureGenerator(POSModel aPosModel) {
this.posTagger = new POSTaggerME(aPosModel);
}
public void createFeatures(List<String> feats, String[] toks, int index, String[] preds) {
if (!Objects.equals(this.cachedTokens, toks)) {
this.cachedTokens = toks;
this.cachedTags = this.posTagger.tag(toks);
}
feats.add("pos=" + this.cachedTags[index]);
}
}