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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 org.apache.lucene.analysis.tokenattributes;


import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.util.Attribute;

/**
 * This attribute can be used to mark a token as a keyword. Keyword aware
 * {@link TokenStream}s can decide to modify a token based on the return value
 * of {@link #isKeyword()} if the token is modified. Stemming filters for
 * instance can use this attribute to conditionally skip a term if
 * {@link #isKeyword()} returns true.
 */
public interface KeywordAttribute extends Attribute {

  /**
   * Returns true if the current token is a keyword, otherwise
   * false
   * 
   * @return true if the current token is a keyword, otherwise
   *         false
   * @see #setKeyword(boolean)
   */
  public boolean isKeyword();

  /**
   * Marks the current token as keyword if set to true.
   * 
   * @param isKeyword
   *          true if the current token is a keyword, otherwise
   *          false.
   * @see #isKeyword()
   */
  public void setKeyword(boolean isKeyword);
}