/**
* 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
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*/
package org.apache.ctakes.temporal.ae.feature;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import org.apache.ctakes.relationextractor.ae.features.RelationFeaturesExtractor;
import org.apache.ctakes.typesystem.type.syntax.ConllDependencyNode;
import org.apache.ctakes.typesystem.type.textsem.IdentifiedAnnotation;
import org.apache.uima.analysis_engine.AnalysisEngineProcessException;
import org.apache.uima.jcas.JCas;
import org.cleartk.classifier.Feature;
public class DependencyPathFeaturesExtractor implements RelationFeaturesExtractor {
@Override
public List<Feature> extract(JCas jCas, IdentifiedAnnotation arg1,
IdentifiedAnnotation arg2) throws AnalysisEngineProcessException {
List<Feature> features = new ArrayList<Feature>();
ConllDependencyNode node1 = DependencyParseUtils.findAnnotationHead(jCas, arg1);
ConllDependencyNode node2 = DependencyParseUtils.findAnnotationHead(jCas, arg2);
if (node1 == null || node2 == null)
{
return features;
}
LinkedList<ConllDependencyNode> node1ToNode2Path = DependencyParseUtils.getPathBetweenNodes(node1, node2);
features.add(new Feature("dependency_path", DependencyParseUtils.pathToString(node1ToNode2Path)));
features.add(new Feature("dependency_path_length", node1ToNode2Path.size()));//add path length as a feature
return features;
}
}