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jfreechart example source code file (DataUtilities.java)

This example jfreechart source code file (DataUtilities.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 - jfreechart tags/keywords

datautilities, defaultkeyedvalues, double, double, illegalargumentexception, illegalargumentexception, keyedvalues, null, null, number, number, util

The jfreechart DataUtilities.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * 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.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * ------------------
 * DataUtilities.java
 * ------------------
 * (C) Copyright 2003-2009, by Object Refinery Limited and contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Peter Kolb (patch 2511330);
 *
 * Changes
 * -------
 * 05-Mar-2003 : Version 1 (DG);
 * 03-Mar-2005 : Moved createNumberArray() and createNumberArray2D() methods
 *               from the DatasetUtilities class (DG);
 * 17-May-2005 : Added calculateColumnTotal() and calculateRowTotal()
 *               methods (DG);
 * 28-Jan-2009 : Added equal(double[][], double[][]) method (DG);
 * 28-Jan-2009 : Added clone(double[][]) method (DG);
 * 04-Feb-2009 : Added calculateColumnTotal/RowTotal variants (PK);
 *
 */

package org.jfree.data;

import java.util.Arrays;
import org.jfree.data.general.DatasetUtilities;

/**
 * Utility methods for use with some of the data classes (but not the datasets,
 * see {@link DatasetUtilities}).
 */
public abstract class DataUtilities {

    /**
     * Tests two arrays for equality.  To be considered equal, the arrays must
     * have exactly the same dimensions, and the values in each array must also
     * match (two values that qre both NaN or both INF are considered equal
     * in this test).
     *
     * @param a  the first array (<code>null permitted).
     * @param b  the second array (<code>null permitted).
     *
     * @return A boolean.
     *
     * @since 1.0.13
     */
    public static boolean equal(double[][] a, double[][] b) {
        if (a == null) {
            return (b == null);
        }
        if (b == null) {
            return false;  // already know 'a' isn't null
        }
        if (a.length != b.length) {
            return false;
        }
        for (int i = 0; i < a.length; i++) {
            if (!Arrays.equals(a[i], b[i])) {
                return false;
            }
        }
        return true;
    }

    /**
     * Returns a clone of the specified array.
     *
     * @param source  the source array (<code>null not permitted).
     *
     * @return A clone of the array.
     *
     * @since 1.0.13
     */
    public static double[][] clone(double[][] source) {
        if (source == null) {
            throw new IllegalArgumentException("Null 'source' argument.");
        }
        double[][] clone = new double[source.length][];
        for (int i = 0; i < source.length; i++) {
            if (source[i] != null) {
                double[] row = new double[source[i].length];
                System.arraycopy(source[i], 0, row, 0, source[i].length);
                clone[i] = row;
            }
        }
        return clone;
    }

    /**
     * Returns the total of the values in one column of the supplied data
     * table.
     *
     * @param data  the table of values (<code>null not permitted).
     * @param column  the column index (zero-based).
     *
     * @return The total of the values in the specified column.
     */
    public static double calculateColumnTotal(Values2D data, int column) {
        if (data == null) {
            throw new IllegalArgumentException("Null 'data' argument.");
        }
        double total = 0.0;
        int rowCount = data.getRowCount();
        for (int r = 0; r < rowCount; r++) {
            Number n = data.getValue(r, column);
            if (n != null) {
                total += n.doubleValue();
            }
        }
        return total;
    }

    /**
     * Returns the total of the values in one column of the supplied data
     * table by taking only the row numbers in the array into account.
     *
     * @param data  the table of values (<code>null not permitted).
     * @param column  the column index (zero-based).
     * @param validRows the array with valid rows (zero-based).
     *
     * @return The total of the valid values in the specified column.
     *
     * @since 1.0.13
     */
     public static double calculateColumnTotal(Values2D data, int column,
             int[] validRows) {
        if (data == null) {
            throw new IllegalArgumentException("Null 'data' argument.");
        }
        double total = 0.0;
        int rowCount = data.getRowCount();
        for (int v = 0; v < validRows.length; v++) {
        	int row = validRows[v];
        	if (row < rowCount) {
	            Number n = data.getValue(row, column);
	            if (n != null) {
	                total += n.doubleValue();
	            }
        	}
        }
        return total;
    }

    /**
     * Returns the total of the values in one row of the supplied data
     * table.
     *
     * @param data  the table of values (<code>null not permitted).
     * @param row  the row index (zero-based).
     *
     * @return The total of the values in the specified row.
     */
    public static double calculateRowTotal(Values2D data, int row) {
        if (data == null) {
            throw new IllegalArgumentException("Null 'data' argument.");
        }
        double total = 0.0;
        int columnCount = data.getColumnCount();
        for (int c = 0; c < columnCount; c++) {
            Number n = data.getValue(row, c);
            if (n != null) {
                total += n.doubleValue();
            }
        }
        return total;
    }

    /**
     * Returns the total of the values in one row of the supplied data
     * table by taking only the column numbers in the array into account.
     *
     * @param data  the table of values (<code>null not permitted).
     * @param row  the row index (zero-based).
     * @param validCols the array with valid cols (zero-based).
     *
     * @return The total of the valid values in the specified row.
     *
     * @since 1.0.13
     */
     public static double calculateRowTotal(Values2D data, int row,
             int[] validCols) {
        if (data == null) {
            throw new IllegalArgumentException("Null 'data' argument.");
        }
        double total = 0.0;
        int colCount = data.getColumnCount();
        for (int v = 0; v < validCols.length; v++) {
        	int col = validCols[v];
        	if (col < colCount) {
	            Number n = data.getValue(row, col);
	            if (n != null) {
	                total += n.doubleValue();
	            }
        	}
        }
        return total;
    }

    /**
     * Constructs an array of <code>Number objects from an array of
     * <code>double primitives.
     *
     * @param data  the data (<code>null not permitted).
     *
     * @return An array of <code>Double.
     */
    public static Number[] createNumberArray(double[] data) {
        if (data == null) {
            throw new IllegalArgumentException("Null 'data' argument.");
        }
        Number[] result = new Number[data.length];
        for (int i = 0; i < data.length; i++) {
            result[i] = new Double(data[i]);
        }
        return result;
    }

    /**
     * Constructs an array of arrays of <code>Number objects from a
     * corresponding structure containing <code>double primitives.
     *
     * @param data  the data (<code>null not permitted).
     *
     * @return An array of <code>Double.
     */
    public static Number[][] createNumberArray2D(double[][] data) {
        if (data == null) {
            throw new IllegalArgumentException("Null 'data' argument.");
        }
        int l1 = data.length;
        Number[][] result = new Number[l1][];
        for (int i = 0; i < l1; i++) {
            result[i] = createNumberArray(data[i]);
        }
        return result;
    }

    /**
     * Returns a {@link KeyedValues} instance that contains the cumulative
     * percentage values for the data in another {@link KeyedValues} instance.
     * <p>
     * The percentages are values between 0.0 and 1.0 (where 1.0 = 100%).
     *
     * @param data  the data (<code>null not permitted).
     *
     * @return The cumulative percentages.
     */
    public static KeyedValues getCumulativePercentages(KeyedValues data) {
        if (data == null) {
            throw new IllegalArgumentException("Null 'data' argument.");
        }
        DefaultKeyedValues result = new DefaultKeyedValues();
        double total = 0.0;
        for (int i = 0; i < data.getItemCount(); i++) {
            Number v = data.getValue(i);
            if (v != null) {
                total = total + v.doubleValue();
            }
        }
        double runningTotal = 0.0;
        for (int i = 0; i < data.getItemCount(); i++) {
            Number v = data.getValue(i);
            if (v != null) {
                runningTotal = runningTotal + v.doubleValue();
            }
            result.addValue(data.getKey(i), new Double(runningTotal / total));
        }
        return result;
    }

}

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