/**
* 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.necontexts.negation;
import java.util.List;
import java.util.Set;
import org.apache.ctakes.core.fsm.machine.NegationFSM;
import org.apache.ctakes.core.fsm.output.NegationIndicator;
import org.apache.ctakes.core.fsm.token.TextToken;
import org.apache.ctakes.necontexts.ContextHit;
import org.apache.ctakes.necontexts.NamedEntityContextAnalyzer;
import org.apache.uima.analysis_engine.AnalysisEngineProcessException;
import org.apache.uima.jcas.tcas.Annotation;
public class NegationContextAnalyzer extends NamedEntityContextAnalyzer {
private NegationFSM _negIndicatorFSM = new NegationFSM();
/**
* This method analyzes a list of tokens looking for a negation pattern as
* specified by the class NegationFSM.
*
* @see NegationFSM
*/
public ContextHit analyzeContext(List<? extends Annotation> contextTokens, int scopeOrientation)
throws AnalysisEngineProcessException {
List<TextToken> fsmTokenList = wrapAsFsmTokens(contextTokens);
try {
Set<NegationIndicator> s = _negIndicatorFSM.execute(fsmTokenList);
if (s.size() > 0) {
NegationIndicator neg = s.iterator().next();
return new ContextHit(neg.getStartOffset(), neg.getEndOffset());
} else {
return null;
}
} catch (Exception e) {
throw new AnalysisEngineProcessException(e);
}
}
}