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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: * DatasetRenderingOrder.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: * 02-May-2003 : Version 1 (DG); 38: * 02-Jun-2004 : Changed 'STANDARD' --> 'FORWARD' (DG); 39: * 21-Nov-2007 : Implemented hashCode() (DG); 40: * 41: */ 42: 43: package org.jfree.chart.plot; 44: 45: import java.io.ObjectStreamException; 46: import java.io.Serializable; 47: 48: /** 49: * Defines the tokens that indicate the rendering order for datasets in a 50: * {@link org.jfree.chart.plot.CategoryPlot} or an 51: * {@link org.jfree.chart.plot.XYPlot}. 52: */ 53: public final class DatasetRenderingOrder implements Serializable { 54: 55: /** For serialization. */ 56: private static final long serialVersionUID = -600593412366385072L; 57: 58: /** 59: * Render datasets in the order 0, 1, 2, ..., N-1, where N is the number 60: * of datasets. 61: */ 62: public static final DatasetRenderingOrder FORWARD 63: = new DatasetRenderingOrder("DatasetRenderingOrder.FORWARD"); 64: 65: /** 66: * Render datasets in the order N-1, N-2, ..., 2, 1, 0, where N is the 67: * number of datasets. 68: */ 69: public static final DatasetRenderingOrder REVERSE 70: = new DatasetRenderingOrder("DatasetRenderingOrder.REVERSE"); 71: 72: /** The name. */ 73: private String name; 74: 75: /** 76: * Private constructor. 77: * 78: * @param name the name. 79: */ 80: private DatasetRenderingOrder(String name) { 81: this.name = name; 82: } 83: 84: /** 85: * Returns a string representing the object. 86: * 87: * @return The string (never <code>null</code>). 88: */ 89: public String toString() { 90: return this.name; 91: } 92: 93: /** 94: * Returns <code>true</code> if this object is equal to the specified 95: * object, and <code>false</code> otherwise. 96: * 97: * @param obj the object (<code>null</code> permitted). 98: * 99: * @return A boolean. 100: */ 101: public boolean equals(Object obj) { 102: if (this == obj) { 103: return true; 104: } 105: if (!(obj instanceof DatasetRenderingOrder)) { 106: return false; 107: } 108: DatasetRenderingOrder order = (DatasetRenderingOrder) obj; 109: if (!this.name.equals(order.toString())) { 110: return false; 111: } 112: return true; 113: } 114: 115: /** 116: * Returns a hash code for this instance. 117: * 118: * @return A hash code. 119: */ 120: public int hashCode() { 121: return this.name.hashCode(); 122: } 123: 124: /** 125: * Ensures that serialization returns the unique instances. 126: * 127: * @return The object. 128: * 129: * @throws ObjectStreamException if there is a problem. 130: */ 131: private Object readResolve() throws ObjectStreamException { 132: if (this.equals(DatasetRenderingOrder.FORWARD)) { 133: return DatasetRenderingOrder.FORWARD; 134: } 135: else if (this.equals(DatasetRenderingOrder.REVERSE)) { 136: return DatasetRenderingOrder.REVERSE; 137: } 138: return null; 139: } 140: 141: }