/**
* 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
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* KIND, either express or implied. See the License for the
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package org.apache.ctakes.assertion.medfacts.cleartk.extractors;
import java.util.ArrayList;
import java.util.List;
import org.apache.ctakes.assertion.util.NegationManualDepContextAnalyzer;
import org.apache.ctakes.dependency.parser.util.DependencyUtility;
import org.apache.ctakes.typesystem.type.syntax.ConllDependencyNode;
import org.apache.ctakes.typesystem.type.textspan.Sentence;
import org.apache.uima.jcas.JCas;
import org.apache.uima.jcas.tcas.Annotation;
import org.cleartk.classifier.Feature;
import org.cleartk.classifier.feature.extractor.CleartkExtractorException;
import org.cleartk.classifier.feature.extractor.simple.SimpleFeatureExtractor;
import org.uimafit.util.JCasUtil;
public class NegationDependencyFeatureExtractor implements
SimpleFeatureExtractor {
NegationManualDepContextAnalyzer conAnal = null;
public NegationDependencyFeatureExtractor(){
conAnal = new NegationManualDepContextAnalyzer();
}
@Override
public List<Feature> extract(JCas jcas, Annotation focusAnnotation)
throws CleartkExtractorException {
List<Feature> feats = new ArrayList<Feature>();
Sentence sent = null;
List<Sentence> sents = JCasUtil.selectCovering(jcas, Sentence.class, focusAnnotation.getBegin(), focusAnnotation.getEnd());
if(sents != null && sents.size() > 0){
sent = sents.get(0);
}else{
return feats;
}
List<ConllDependencyNode> nodes = DependencyUtility.getDependencyNodes(jcas, sent);
ConllDependencyNode headNode = DependencyUtility.getNominalHeadNode(jcas, focusAnnotation);
try {
boolean[] regexFeats = conAnal.findNegationContext(nodes, headNode);
for(int j = 0; j < regexFeats.length; j++){
if(regexFeats[j]){
feats.add(new Feature("DepPath_" + conAnal.getRegexName(j))); //"NEG_DEP_REGEX_"+j));
}
}
} catch (Exception e) {
e.printStackTrace();
throw new CleartkExtractorException(e);
}
return feats;
}
}