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/*
 * 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 opennlp.tools.parser;

import java.util.Stack;

/**
 * Represents a labeler for nodes which contain traces so that these traces can be predicted
 * by a {@link Parser}.
 *
 * @see Parser
 */
public interface GapLabeler {
  
  /**
   * Labels {@link Constituent constituents} found in the {@code stack} with gap labels
   * if appropriate.
   *
   * @param stack The {@link Stack} of un-completed {@link Constituent constituents}.
   */
  void labelGaps(Stack stack);
}