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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 FloatMatrix extends PrimitiveMatrix {

  private static final long serialVersionUID = 1L;

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

  public FloatMatrix() {
    super(float.class);
  }

  public synchronized void set(int x, int y, float 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.setFloat(row, y, n);
    _rowCount = Math.max(x, _rowCount);
    _colCount = Math.max(y, _colCount);
  }

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

  public synchronized float[][] toArray() {
    float[][] ret = new float[_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;
  }
}