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* 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.Collection;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import org.apache.ctakes.relationextractor.ae.features.RelationFeaturesExtractor;
import org.apache.ctakes.typesystem.type.textsem.EventMention;
import org.apache.ctakes.typesystem.type.textsem.IdentifiedAnnotation;
import org.apache.ctakes.typesystem.type.textsem.TimeMention;
import org.apache.ctakes.typesystem.type.textspan.Sentence;
import org.apache.uima.analysis_engine.AnalysisEngineProcessException;
import org.apache.uima.jcas.JCas;
import org.cleartk.classifier.Feature;
import org.uimafit.util.JCasUtil;
public class NearestFlagFeatureExtractor implements
RelationFeaturesExtractor {
@Override
public List<Feature> extract(JCas jCas, IdentifiedAnnotation arg1,
IdentifiedAnnotation arg2) throws AnalysisEngineProcessException {
ArrayList<Feature> feats = new ArrayList<Feature>();
EventMention event = null;
TimeMention time = null;
// swap the order if necessary:
if(arg2.getBegin() <= arg1.getBegin() && arg2.getEnd() <= arg1.getEnd()){
IdentifiedAnnotation temp = arg1;
arg1 = arg2;
arg2 = temp;
}
if(arg1 instanceof EventMention){
event = (EventMention) arg1;
time = (TimeMention) arg2;
}else{
time = (TimeMention) arg1;
event = (EventMention) arg2;
}
//1 get covering sentence:
Map<EventMention, Collection<Sentence>> eventCoveringMap =
JCasUtil.indexCovering(jCas, EventMention.class, Sentence.class);
Collection<Sentence> eventSentList = eventCoveringMap.get(event);
Map<TimeMention, Collection<Sentence>> timeCoveringMap =
JCasUtil.indexCovering(jCas, TimeMention.class, Sentence.class);
Collection<Sentence> timeSentList = timeCoveringMap.get(time);
//2 get TimeX
Map<Integer, TimeMention> timeDistMap = null;
Map<Integer, EventMention> eventDistMap = null;
if (eventSentList != null && !eventSentList.isEmpty()){
timeDistMap = new TreeMap<Integer, TimeMention>();
for(Sentence sent : eventSentList) {
for (TimeMention atime : JCasUtil.selectCovered(jCas, TimeMention.class, sent)) {
timeDistMap.put(Math.abs(atime.getBegin() - event.getBegin()), atime);
}
}
//get the closest Time Expression feature
for (Map.Entry<Integer, TimeMention> entry : timeDistMap.entrySet()) {
if( entry.getValue().equals(time)){
Feature indicator = new Feature("ClosestPair", "ClosestPair");
feats.add(indicator);
return feats;
}
break;
}
}
if (timeSentList != null && !timeSentList.isEmpty()){
eventDistMap = new TreeMap<Integer, EventMention>();
for(Sentence sent : timeSentList) {
for (EventMention aEvent : JCasUtil.selectCovered(jCas, EventMention.class, sent)) {
eventDistMap.put(Math.abs(aEvent.getBegin() - time.getBegin()), aEvent);
}
}
//get the closest Event feature
for (Map.Entry<Integer, EventMention> entry : eventDistMap.entrySet()) {
if( entry.getValue().equals(event)){
Feature indicator = new Feature("ClosestPair", "ClosestPair");
feats.add(indicator);
}
break;
}
}
return feats;
}
}