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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: * TimePeriodAnchor.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: * 30-Jul-2003 : Version 1 (DG); 38: * 01-Mar-2004 : Added readResolve() method (DG); 39: * 40: */ 41: 42: package org.jfree.data.time; 43: 44: import java.io.ObjectStreamException; 45: import java.io.Serializable; 46: 47: /** 48: * Used to indicate one of three positions in a time period: 49: * <code>START</code>, <code>MIDDLE</code> and <code>END</code>. 50: */ 51: public final class TimePeriodAnchor implements Serializable { 52: 53: /** For serialization. */ 54: private static final long serialVersionUID = 2011955697457548862L; 55: 56: /** Start of period. */ 57: public static final TimePeriodAnchor START 58: = new TimePeriodAnchor("TimePeriodAnchor.START"); 59: 60: /** Middle of period. */ 61: public static final TimePeriodAnchor MIDDLE 62: = new TimePeriodAnchor("TimePeriodAnchor.MIDDLE"); 63: 64: /** End of period. */ 65: public static final TimePeriodAnchor END 66: = new TimePeriodAnchor("TimePeriodAnchor.END"); 67: 68: /** The name. */ 69: private String name; 70: 71: /** 72: * Private constructor. 73: * 74: * @param name the name. 75: */ 76: private TimePeriodAnchor(String name) { 77: this.name = name; 78: } 79: 80: /** 81: * Returns a string representing the object. 82: * 83: * @return The string. 84: */ 85: public String toString() { 86: return this.name; 87: } 88: 89: /** 90: * Returns <code>true</code> if this object is equal to the specified 91: * object, and <code>false</code> otherwise. 92: * 93: * @param obj the other object. 94: * 95: * @return A boolean. 96: */ 97: public boolean equals(Object obj) { 98: 99: if (this == obj) { 100: return true; 101: } 102: if (!(obj instanceof TimePeriodAnchor)) { 103: return false; 104: } 105: 106: TimePeriodAnchor position = (TimePeriodAnchor) obj; 107: if (!this.name.equals(position.name)) { 108: return false; 109: } 110: 111: return true; 112: } 113: 114: /** 115: * Returns a hash code value for the object. 116: * 117: * @return The hashcode 118: */ 119: public int hashCode() { 120: return this.name.hashCode(); 121: } 122: 123: /** 124: * Ensures that serialization returns the unique instances. 125: * 126: * @return The object. 127: * 128: * @throws ObjectStreamException if there is a problem. 129: */ 130: private Object readResolve() throws ObjectStreamException { 131: if (this.equals(TimePeriodAnchor.START)) { 132: return TimePeriodAnchor.START; 133: } 134: else if (this.equals(TimePeriodAnchor.MIDDLE)) { 135: return TimePeriodAnchor.MIDDLE; 136: } 137: else if (this.equals(TimePeriodAnchor.END)) { 138: return TimePeriodAnchor.END; 139: } 140: return null; 141: } 142: 143: }