/**
* 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 org.apache.ctakes.relationextractor.ae.features;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Scanner;
import org.apache.ctakes.constituency.parser.treekernel.TreeExtractor;
import org.apache.ctakes.constituency.parser.util.AnnotationTreeUtils;
import org.apache.ctakes.constituency.parser.util.TreeUtils;
import org.apache.ctakes.core.resource.FileLocator;
import org.apache.ctakes.typesystem.type.syntax.TopTreebankNode;
import org.apache.ctakes.typesystem.type.syntax.TreebankNode;
import org.apache.ctakes.typesystem.type.textsem.IdentifiedAnnotation;
import org.apache.ctakes.utils.tree.FragmentUtils;
import org.apache.ctakes.utils.tree.SimpleTree;
import org.apache.uima.analysis_engine.AnalysisEngineProcessException;
import org.apache.uima.jcas.JCas;
import org.cleartk.classifier.Feature;
/*
* This class implements a ClearTK feature extractor for tree kernel fragment features
* as derived using the flink toolkit (http://danielepighin.net/cms/software/flink).
* Model location is hardcoded as of right now.
* TODO: Parameterize & unstaticize this so that, e.g., multiple projects could use this feature if necessary.
*/
public class TreeFragmentFeatureExtractor implements RelationFeaturesExtractor {
static HashSet<SimpleTree> frags = null;
public TreeFragmentFeatureExtractor(){
if(frags == null) initializeFrags();
}
private static void initializeFrags(){
frags = new HashSet<SimpleTree>();
try{
// File fragsFile = FileLocator.locateFile("resources/frags_args.txt");
File fragsFile = FileLocator.locateFile("org/apache/ctakes/relationextractor/frags_nolex_args.txt");
Scanner scanner = new Scanner(fragsFile);
while(scanner.hasNextLine()){
frags.add(FragmentUtils.frag2tree(scanner.nextLine().trim()));
}
}catch(FileNotFoundException e){
System.err.println("Missing fragment file!");
}
}
@Override
public List<Feature> extract(JCas jcas, IdentifiedAnnotation arg1,
IdentifiedAnnotation arg2) throws AnalysisEngineProcessException {
List<Feature> features = new ArrayList<Feature>();
// first get the root and print it out...
TopTreebankNode root = AnnotationTreeUtils.getTreeCopy(jcas, AnnotationTreeUtils.getAnnotationTree(jcas, arg1));
// SimpleTree tempClone = TreeExtractor.getSimpleClone(root);
TreebankNode t1 = AnnotationTreeUtils.insertAnnotationNode(jcas, root, arg1, "ARG1");
TreebankNode t2 = AnnotationTreeUtils.insertAnnotationNode(jcas, root, arg2, "ARG2");
SimpleTree tree = null;
if(t1.getBegin() <= t2.getBegin() && t1.getEnd() >= t2.getEnd()){
// t1 encloses t2
tree = TreeExtractor.getSimpleClone(t1);
}else if(t2.getBegin() <= t1.getBegin() && t2.getEnd() >= t1.getEnd()){
// t2 encloses t1
tree = TreeExtractor.getSimpleClone(t2);
}else{
tree = TreeExtractor.extractPathEnclosedTree(t1, t2, jcas);
}
for(SimpleTree frag : frags){
if(TreeUtils.containsIgnoreCase(tree, frag)){
features.add(new Feature("TK_" + frag.toString()));
// }else{
// features.add(new Feature(frag.toString(), false));
}
}
return features;
}
}