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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreemnets.  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 opennlp.tools.coref.mention;

/**
 * Finds mentions from shallow np-chunking based parses.
 */
public class ShallowParseMentionFinder extends AbstractMentionFinder {

  private static ShallowParseMentionFinder instance;

  private ShallowParseMentionFinder(HeadFinder hf) {
    headFinder = hf;
    collectPrenominalNamedEntities=true;
    collectCoordinatedNounPhrases=true;
  }

  /**
   * Retrieves the one and only existing instance.
   *
   * @param hf
   * @return one and only existing instance
   */
  public static ShallowParseMentionFinder getInstance(HeadFinder hf) {
    if (instance == null) {
      instance = new ShallowParseMentionFinder(hf);
    }
    else if (instance.headFinder != hf) {
      instance = new ShallowParseMentionFinder(hf);
    }
    return instance;
  }

  /*
  protected final List getNounPhrases(Parse p) {
    List nps = p.getNounPhrases();
    List basals = new ArrayList();
    for (int ni=0,ns=nps.size();ni