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Bobo is a Faceted Search implementation written purely in Java, an extension of Apache Lucene

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/**
 * Bobo Browse Engine - High performance faceted/parametric search implementation 
 * that handles various types of semi-structured data.  Written in Java.
 * 
 * Copyright (C) 2005-2006  John Wang
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * To contact the project administrators for the bobo-browse project, 
 * please go to https://sourceforge.net/projects/bobo-browse/, or 
 * send mail to [email protected].
 */

package com.browseengine.bobo.util;

import java.lang.reflect.Array;

public class IntMatrix extends PrimitiveMatrix {

  /**
   * 
   */
  private static final long serialVersionUID = 1L;

  public IntMatrix(int[] sizes) {
    super(int.class, sizes);
  }

  public IntMatrix() {
    super(int.class);
  }

  public synchronized void set(int x, int y, int n) {
    ensureCapacity(x, y);
    // get the row
    Object row = Array.get(_matrix, x);
    if (row == null) {
      throw new ArrayIndexOutOfBoundsException("index out of bounds: " + x);
    }
    Array.setInt(row, y, n);
    _rowCount = Math.max(x, _rowCount);
    _colCount = Math.max(y, _colCount);
  }

  public int get(int r, int c) {
    Object row = Array.get(_matrix, r);
    if (row == null) {
      throw new ArrayIndexOutOfBoundsException("index out of bounds: " + r);
    }
    return Array.getInt(row, c);
  }

  public synchronized int[][] toArray() {
    int[][] ret = new int[_rowCount][_colCount];
    for (int i = 0; i < _rowCount; ++i) {
      Object row = Array.get(_matrix, i);
      System.arraycopy(row, 0, ret[i], 0, _colCount);
    }
    return ret;
  }

  public static void main(String[] args) {
    IntMatrix matrix = new IntMatrix(new int[] { 2, 4 });
    matrix.set(0, 0, 5);
    // matrix.set(1, 1, 6);
    // matrix.set(2, 2, 7);
    matrix.set(100, 100, 9);
    System.out.println(matrix);
    matrix.seal();
    System.out.println(matrix);

  }
}