home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Lucene example source code file (IntBlockPool.java)

This example Lucene source code file (IntBlockPool.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

current, current, documentswriter, documentswriter, intblockpool, intblockpool, where, which, which

The Lucene IntBlockPool.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.

final class IntBlockPool {

  public int[][] buffers = new int[10][];

  int bufferUpto = -1;                        // Which buffer we are upto
  public int intUpto = DocumentsWriter.INT_BLOCK_SIZE;             // Where we are in head buffer

  public int[] buffer;                              // Current head buffer
  public int intOffset = -DocumentsWriter.INT_BLOCK_SIZE;          // Current head offset

  final private DocumentsWriter docWriter;

  public IntBlockPool(DocumentsWriter docWriter) {
    this.docWriter = docWriter;

  public void reset() {
    if (bufferUpto != -1) {
      if (bufferUpto > 0)
        // Recycle all but the first buffer
        docWriter.recycleIntBlocks(buffers, 1, 1+bufferUpto);

      // Reuse first buffer
      bufferUpto = 0;
      intUpto = 0;
      intOffset = 0;
      buffer = buffers[0];

  public void nextBuffer() {
    if (1+bufferUpto == buffers.length) {
      int[][] newBuffers = new int[(int) (buffers.length*1.5)][];
      System.arraycopy(buffers, 0, newBuffers, 0, buffers.length);
      buffers = newBuffers;
    buffer = buffers[1+bufferUpto] = docWriter.getIntBlock();

    intUpto = 0;
    intOffset += DocumentsWriter.INT_BLOCK_SIZE;

Other Lucene examples (source code examples)

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

my book on functional programming


new blog posts


Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.