001/** 
002 * Copyright (c) 2007-2008, Regents of the University of Colorado 
003 * All rights reserved.
004 * 
005 * Redistribution and use in source and binary forms, with or without
006 * modification, are permitted provided that the following conditions are met:
007 * 
008 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 
009 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 
010 * Neither the name of the University of Colorado at Boulder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. 
011 * 
012 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
013 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
014 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
015 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
016 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
017 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
018 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
019 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
020 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
021 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
022 * POSSIBILITY OF SUCH DAMAGE. 
023 */
024package org.cleartk.feature.syntax;
025
026import java.util.ArrayList;
027import java.util.Collections;
028import java.util.List;
029
030import org.apache.uima.jcas.JCas;
031import org.cleartk.ml.Feature;
032import org.cleartk.ml.feature.extractor.NamedFeatureExtractor1;
033import org.cleartk.syntax.constituent.type.TreebankNode;
034import org.apache.uima.fit.util.JCasUtil;
035
036/**
037 * <br>
038 * Copyright (c) 2007-2008, Regents of the University of Colorado <br>
039 * All rights reserved.
040 * 
041 * 
042 * @author Philipp Wetzler
043 */
044
045public class SubCategorizationExtractor implements NamedFeatureExtractor1<TreebankNode> {
046  private String featureName;
047
048  public SubCategorizationExtractor(String name) {
049    this.featureName = Feature.createName(name, "SubCategorization");
050  }
051
052  public SubCategorizationExtractor() {
053    this(null);
054  }
055  
056  @Override
057  public String getFeatureName() {
058    return this.featureName;
059  }
060
061  public List<Feature> extract(JCas jCas, TreebankNode node)
062      throws UnsupportedOperationException {
063
064    TreebankNode parent = node.getParent();
065    if (parent == null)
066      return new ArrayList<Feature>();
067
068    StringBuffer buffer = new StringBuffer();
069    buffer.append(parent.getNodeType() + "->");
070    boolean first = true;
071    for (TreebankNode child : JCasUtil.select(parent.getChildren(), TreebankNode.class)) {
072      if (!first)
073        buffer.append("-");
074      buffer.append(child.getNodeType());
075      first = false;
076    }
077
078    return Collections.singletonList(new Feature(this.featureName, buffer));
079  }
080}