ChunkerContextGenerator.java

/*
 * 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
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 */

package org.cogroo.tools.chunker2;

import opennlp.tools.util.BeamSearchContextGenerator;

/**
 * Interface for the context generator used in syntactic chunking.
 */
public interface ChunkerContextGenerator extends BeamSearchContextGenerator<TokenTag> {

  /**
   * Returns the contexts for chunking of the specified index.
   * @param i The index of the token in the specified toks array for which the context should be constructed.
   * @param toks The tokens of the sentence.  The <code>toString</code> methods of these objects
   *             should return the token text.
   * @param tags The POS tags for the the specified tokens.
   * @param preds The previous decisions made in the taging of this sequence.
   *              Only indices less than i will be examined.
   * @return An array of predictive contexts on which a model basis its decisions.
   */
  String[] getContext(int i, String[] toks, String[] tags, String[] preds);
}