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Lucene example source code file (ReusableStringReader.java)

This example Lucene source code file (ReusableStringReader.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

io, override, override, reader, reader, reusablestringreader, reusablestringreader, string, string

The Lucene ReusableStringReader.java source code

package org.apache.lucene.index;

 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import java.io.Reader;

/** Used by DocumentsWriter to implemented a StringReader
 *  that can be reset to a new string; we use this when
 *  tokenizing the string value from a Field. */
final class ReusableStringReader extends Reader {
  int upto;
  int left;
  String s;
  void init(String s) {
    this.s = s;
    left = s.length();
    this.upto = 0;
  public int read(char[] c) {
    return read(c, 0, c.length);
  public int read(char[] c, int off, int len) {
    if (left > len) {
      s.getChars(upto, upto+len, c, off);
      upto += len;
      left -= len;
      return len;
    } else if (0 == left) {
      // don't keep a reference (s could have been very large)
      s = null;
      return -1;
    } else {
      s.getChars(upto, upto+left, c, off);
      int r = left;
      left = 0;
      upto = s.length();
      return r;
  public void close() {}

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene ReusableStringReader.java source code file:

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