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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 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.
 import java.util.List;
 import java.util.Map;
Count the number of EventMentions in the same sentence as the two arguments, used for features for within sentence event-event relation discovery

 public class NumberOfEventsInTheSameSentenceExtractor implements
 	public List<Feature> extract(JCas jCasIdentifiedAnnotation arg1,
 		ArrayList<Feature> feats = new ArrayList<>();
 		//get the sentence that covers the first argument, suppose arg1 and arg2 are within the same sentence
 		Collection<SentencesentList = coveringMap.get(arg1);
 		if (sentList == null && sentList.isEmpty()) return feats;
 		for(Sentence sent : sentList) {
 			List<EventMentionevents = JCasUtil.selectCovered(jCasEventMention.classsent);
 			//filter out ctakes events:
 			List<EventMentionrealEvents = Lists.newArrayList();
 			forEventMention event : events){
 			events = realEvents;
 			int eventsNum = events==null? 0: events.size();
 			//find the two arguments indices in the event list
 			int arg1Index = -1;
 			int arg2Index = -1;
 			for(int i=0; ieventsNumi++){
 				EventMention currentEvent = events.get(i);
 					arg1Index = i;
 					arg2Index = i;
 				if(arg1Index!=-1 && arg2Index!=-1){
 //			feats.add(new Feature("NumOfEvents_InTheSentence", eventsNum)); //tried this feature, but it is not helpful.
 			if(arg1Index!=-1 && arg2Index!=-1){
 //				feats.add(new Feature("arg1_index", arg1Index));
 //				feats.add(new Feature("arg2_index", arg2Index)); //tried these two features, but not helpful
 //				if(arg1Index == 0 || arg2Index == 0){
 //					feats.add(new Feature("EventPair_", "ContainsTheFirstEvent"));
 //				}// tried this feature, but not helpful
 //				if(arg1Index == eventsNum-1 || arg2Index == eventsNum-1){
 //					feats.add(new Feature("EventPair_", "ContainsTheLastEvent"));
 //				}// tired, not helpful
 				int dis = Math.abs(arg1Index-arg2Index);
 				feats.add(new Feature("EventPair_Distance"dis));
 				if(dis == eventsNum-1){
 					feats.add(new Feature("EventPair_""Major"));
					feats.add(new Feature("EventPair_""Consecutive"));
				..println("Same sentence events matching error.");
		return feats;
	private static boolean hasOverlappingSpan(EventMention cevent,
		if(cevent.getBegin()==arg.getBegin() || arg.getEnd()==cevent.getEnd()){
			return true;
		}else if(arg.getBegin()<=cevent.getBegin() && cevent.getEnd()>=arg.getEnd()){
			return true;
		}else if(arg.getBegin()>=cevent.getBegin() && cevent.getEnd()<=arg.getEnd()){ //if argument cover current (gold) event mention.
			return true;
		return false;
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