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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: * AbstractIntervalXYDataset.java 29: * ------------------------------ 30: * (C) Copyright 2004-2007, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited). 33: * Contributor(s): -; 34: * 35: * Changes 36: * ------- 37: * 05-May-2004 : Version 1 (DG); 38: * 15-Jul-2004 : Switched getStartX() and getStartXValue() methods and 39: * others (DG); 40: * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG); 41: * 42: */ 43: 44: package org.jfree.data.xy; 45: 46: 47: /** 48: * An base class that you can use to create new implementations of the 49: * {@link IntervalXYDataset} interface. 50: */ 51: public abstract class AbstractIntervalXYDataset extends AbstractXYDataset 52: implements IntervalXYDataset { 53: 54: /** 55: * Returns the start x-value (as a double primitive) for an item within a 56: * series. 57: * 58: * @param series the series index (zero-based). 59: * @param item the item index (zero-based). 60: * 61: * @return The value. 62: */ 63: public double getStartXValue(int series, int item) { 64: double result = Double.NaN; 65: Number x = getStartX(series, item); 66: if (x != null) { 67: result = x.doubleValue(); 68: } 69: return result; 70: } 71: 72: /** 73: * Returns the end x-value (as a double primitive) for an item within a 74: * series. 75: * 76: * @param series the series index (zero-based). 77: * @param item the item index (zero-based). 78: * 79: * @return The value. 80: */ 81: public double getEndXValue(int series, int item) { 82: double result = Double.NaN; 83: Number x = getEndX(series, item); 84: if (x != null) { 85: result = x.doubleValue(); 86: } 87: return result; 88: } 89: 90: /** 91: * Returns the start y-value (as a double primitive) for an item within a 92: * series. 93: * 94: * @param series the series index (zero-based). 95: * @param item the item index (zero-based). 96: * 97: * @return The value. 98: */ 99: public double getStartYValue(int series, int item) { 100: double result = Double.NaN; 101: Number y = getStartY(series, item); 102: if (y != null) { 103: result = y.doubleValue(); 104: } 105: return result; 106: } 107: 108: /** 109: * Returns the end y-value (as a double primitive) for an item within a 110: * series. 111: * 112: * @param series the series (zero-based index). 113: * @param item the item (zero-based index). 114: * 115: * @return The value. 116: */ 117: public double getEndYValue(int series, int item) { 118: double result = Double.NaN; 119: Number y = getEndY(series, item); 120: if (y != null) { 121: result = y.doubleValue(); 122: } 123: return result; 124: } 125: 126: }