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/**
 * Copyright (c) 2011, The University of Southampton and the individual contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   *  Redistributions of source code must retain the above copyright notice,
 *  this list of conditions and the following disclaimer.
 *
 *   *  Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *
 *   *  Neither the name of the University of Southampton nor the names of its
 *  contributors may be used to endorse or promote products derived from this
 *  software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.openimaj.math.matrix;

import gov.nist.math.jama.JamaMatrix;

import java.util.Arrays;

import ch.akuhn.matrix.KuhnMatrix;

/**
 * Dense matrix wrapper for a JAMA matrix.
 *
 * @author Jonathon Hare ([email protected])
 */
public class JamaDenseMatrix extends KuhnMatrix {

    /** The underlying matrix */
    public JamaMatrix matrix;

    /**
     * Construct with matrix. The matrix is retained.
     *
     * @param matrix
     *            The matrix.
     */
    public JamaDenseMatrix(JamaMatrix matrix) {
        this.matrix = matrix;
    }

    /**
     * Construct with 2d array of data.
     *
     * @param values
     *            The data.
     */
    public JamaDenseMatrix(double[][] values) {
        this.matrix = new JamaMatrix(values);
        this.assertInvariant();
    }

    protected void assertInvariant() throws IllegalArgumentException {
        if (matrix.getArray().length == 0) {
            return;
        }
        int m = matrix.getArray()[0].length;
        for (int n = 0; n < matrix.getArray().length; n++) {
            if (matrix.getArray()[n].length != m) {
                throw new IllegalArgumentException();
            }
        }
    }

    /**
     * Construct with given dimensions.
     *
     * @param rows
     *            number of rows.
     * @param columns
     *            number of columns.
     */
    public JamaDenseMatrix(int rows, int columns) {
        this.matrix = new JamaMatrix(rows, columns);
    }

    @Override
    public double add(int row, int column, double value) {
        return matrix.getArray()[row][column] += value;
    }

    @Override
    public int columnCount() {
        return matrix.getColumnDimension();
    }

    @Override
    public double get(int row, int column) {
        return matrix.get(row, column);
    }

    @Override
    public double put(int row, int column, double value) {
        matrix.set(row, column, value);
        return value;
    }

    @Override
    public int rowCount() {
        return matrix.getRowDimension();
    }

    @Override
    public int used() {
        throw new IllegalStateException();
    }

    @Override
    public double[][] unwrap() {
        return matrix.getArray();
    }

    /**
     * Fill the elements with a constant value.
     *
     * @param constant
     *            the value to set the elements to.
     */
    public void fill(double constant) {
        for (double[] row : matrix.getArray()) {
            Arrays.fill(row, constant);
        }
    }

    /**
     * Multiply all elements by a constant.
     *
     * @param d
     *            the multiplication factor.
     */
    public void applyMultiplication(double d) {
        matrix.timesEquals(d);
    }

    /**
     * @return the wrapped JAMA matrix
     */
    public JamaMatrix getMatrix() {
        return matrix;
    }

    @Override
    public double[][] asArray() {
        return matrix.getArray();
    }

    @Override
    public KuhnMatrix newInstance(int rows, int cols) {
        return new JamaDenseMatrix(rows, cols);
    }
}