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1: /* =========================================================== 2: * JFreeChart : a free chart library for the Java(tm) platform 3: * =========================================================== 4: * 5: * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jfreechart/index.html 8: * 9: * This library is free software; you can redistribute it and/or modify it 10: * under the terms of the GNU Lesser General Public License as published by 11: * the Free Software Foundation; either version 2.1 of the License, or 12: * (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but 15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17: * License for more details. 18: * 19: * You should have received a copy of the GNU Lesser General Public 20: * License along with this library; if not, write to the Free Software 21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 22: * USA. 23: * 24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 25: * in the United States and other countries.] 26: * 27: * ------------------ 28: * DataUtilities.java 29: * ------------------ 30: * (C) Copyright 2003-2007, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * Changes 36: * ------- 37: * 05-Mar-2003 : Version 1 (DG); 38: * 03-Mar-2005 : Moved createNumberArray() and createNumberArray2D() methods 39: * from the DatasetUtilities class (DG); 40: * 17-May-2005 : Added calculateColumnTotal() and calculateRowTotal() 41: * methods (DG); 42: * 43: */ 44: 45: package org.jfree.data; 46: 47: import org.jfree.data.general.DatasetUtilities; 48: 49: /** 50: * Utility methods for use with some of the data classes (but not the datasets, 51: * see {@link DatasetUtilities}). 52: */ 53: public abstract class DataUtilities { 54: 55: /** 56: * Returns the total of the values in one column of the supplied data 57: * table. 58: * 59: * @param data the table of values (<code>null</code> not permitted). 60: * @param column the column index (zero-based). 61: * 62: * @return The total of the values in the specified column. 63: */ 64: public static double calculateColumnTotal(Values2D data, int column) { 65: double total = 0.0; 66: int rowCount = data.getRowCount(); 67: for (int r = 0; r < rowCount; r++) { 68: Number n = data.getValue(r, column); 69: if (n != null) { 70: total += n.doubleValue(); 71: } 72: } 73: return total; 74: } 75: 76: /** 77: * Returns the total of the values in one row of the supplied data 78: * table. 79: * 80: * @param data the table of values (<code>null</code> not permitted). 81: * @param row the row index (zero-based). 82: * 83: * @return The total of the values in the specified row. 84: */ 85: public static double calculateRowTotal(Values2D data, int row) { 86: double total = 0.0; 87: int columnCount = data.getColumnCount(); 88: for (int c = 0; c < columnCount; c++) { 89: Number n = data.getValue(row, c); 90: if (n != null) { 91: total += n.doubleValue(); 92: } 93: } 94: return total; 95: } 96: 97: /** 98: * Constructs an array of <code>Number</code> objects from an array of 99: * <code>double</code> primitives. 100: * 101: * @param data the data (<code>null</code> not permitted). 102: * 103: * @return An array of <code>Double</code>. 104: */ 105: public static Number[] createNumberArray(double[] data) { 106: if (data == null) { 107: throw new IllegalArgumentException("Null 'data' argument."); 108: } 109: Number[] result = new Number[data.length]; 110: for (int i = 0; i < data.length; i++) { 111: result[i] = new Double(data[i]); 112: } 113: return result; 114: } 115: 116: /** 117: * Constructs an array of arrays of <code>Number</code> objects from a 118: * corresponding structure containing <code>double</code> primitives. 119: * 120: * @param data the data (<code>null</code> not permitted). 121: * 122: * @return An array of <code>Double</code>. 123: */ 124: public static Number[][] createNumberArray2D(double[][] data) { 125: if (data == null) { 126: throw new IllegalArgumentException("Null 'data' argument."); 127: } 128: int l1 = data.length; 129: Number[][] result = new Number[l1][]; 130: for (int i = 0; i < l1; i++) { 131: result[i] = createNumberArray(data[i]); 132: } 133: return result; 134: } 135: 136: /** 137: * Returns a {@link KeyedValues} instance that contains the cumulative 138: * percentage values for the data in another {@link KeyedValues} instance. 139: * <p> 140: * The percentages are values between 0.0 and 1.0 (where 1.0 = 100%). 141: * 142: * @param data the data (<code>null</code> not permitted). 143: * 144: * @return The cumulative percentages. 145: */ 146: public static KeyedValues getCumulativePercentages(KeyedValues data) { 147: if (data == null) { 148: throw new IllegalArgumentException("Null 'data' argument."); 149: } 150: DefaultKeyedValues result = new DefaultKeyedValues(); 151: double total = 0.0; 152: for (int i = 0; i < data.getItemCount(); i++) { 153: Number v = data.getValue(i); 154: if (v != null) { 155: total = total + v.doubleValue(); 156: } 157: } 158: double runningTotal = 0.0; 159: for (int i = 0; i < data.getItemCount(); i++) { 160: Number v = data.getValue(i); 161: if (v != null) { 162: runningTotal = runningTotal + v.doubleValue(); 163: } 164: result.addValue(data.getKey(i), new Double(runningTotal / total)); 165: } 166: return result; 167: } 168: 169: }