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Lucene example source code file (CharStream.java)

This example Lucene source code file (CharStream.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

charstream, charstream, io, reader, reader

The Lucene CharStream.java source code

/**
 * 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;

import java.io.Reader;

/**
 * CharStream adds {@link #correctOffset}
 * functionality over {@link Reader}.  All Tokenizers accept a
 * CharStream instead of {@link Reader} as input, which enables
 * arbitrary character based filtering before tokenization. 
 * The {@link #correctOffset} method fixed offsets to account for
 * removal or insertion of characters, so that the offsets
 * reported in the tokens match the character offsets of the
 * original Reader.
 */
public abstract class CharStream extends Reader {

  /**
   * Called by CharFilter(s) and Tokenizer to correct token offset.
   *
   * @param currentOff offset as seen in the output
   * @return corrected offset based on the input
   */
  public abstract int correctOffset(int currentOff);
}

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