/**
* 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.status;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.apache.ctakes.core.fsm.machine.StatusIndicatorFSM;
import org.apache.ctakes.core.fsm.output.StatusIndicator;
import org.apache.ctakes.core.fsm.token.TextToken;
import org.apache.ctakes.necontexts.ContextAnalyzer;
import org.apache.ctakes.necontexts.ContextAnnotator;
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 StatusContextAnalyzer extends NamedEntityContextAnalyzer implements ContextAnalyzer {
public static final String CTX_HIT_KEY_STATUS_TYPE = "STATUS_TYPE";
private StatusIndicatorFSM _statusIndicatorFSM = new StatusIndicatorFSM();
/**
* Analyze a list of tokens looking for a status pattern as
* specified by the class StatusIndicatorFSM.
* An indication of family history found within the scope takes precedence over
* an indication of history of, even if evidence of history of is closer.
* Otherwise, the closest indicator of status is used.
*
* @see StatusIndicatorFSM
*/
public ContextHit analyzeContext(List<? extends Annotation> tokenList, int scope) throws AnalysisEngineProcessException{
List<TextToken> fsmTokenList = wrapAsFsmTokens(tokenList);
try {
Set<StatusIndicator> s = _statusIndicatorFSM.execute(fsmTokenList);
if (s.size() > 0) {
StatusIndicator finalSi = null;
Iterator<StatusIndicator> siItr = s.iterator();
while (siItr.hasNext()) {
StatusIndicator si = siItr.next();
if (finalSi == null) {
finalSi = si;
} else if ((si.getStatus() == StatusIndicator.FAMILY_HISTORY_STATUS)
&& (finalSi.getStatus() == StatusIndicator.HISTORY_STATUS)) {
// family history always overrides history
finalSi = si;
} else if ((scope == ContextAnnotator.LEFT_SCOPE) && (si.getEndOffset() > finalSi.getEndOffset())) {
// pick one with closest proximity to focus
finalSi = si;
} else if ((scope == ContextAnnotator.RIGHT_SCOPE)
&& (si.getStartOffset() < finalSi.getStartOffset())) {
// pick one w/ closest proximity to focus
finalSi = si;
}
}
ContextHit ctxHit = new ContextHit(finalSi.getStartOffset(), finalSi.getEndOffset());
ctxHit.addMetaData(CTX_HIT_KEY_STATUS_TYPE, new Integer(finalSi.getStatus()));
return ctxHit;
} else {
return null;
}
} catch (Exception e) {
throw new AnalysisEngineProcessException(e);
}
}
}