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1: /* ======================================================================== 2: * JCommon : a free general purpose class library for the Java(tm) platform 3: * ======================================================================== 4: * 5: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 6: * 7: * Project Info: http://www.jfree.org/jcommon/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: * UnitType.java 29: * ------------- 30: * (C) Copyright 2004, 2005, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * $Id: UnitType.java,v 1.7 2005/10/18 13:24:19 mungady Exp $ 36: * 37: * Changes: 38: * -------- 39: * 11-Feb-2004 : Version 1 (DG); 40: * 41: */ 42: 43: package org.jfree.util; 44: 45: import java.io.ObjectStreamException; 46: import java.io.Serializable; 47: 48: /** 49: * Used to indicate absolute or relative units. 50: * 51: * @author David Gilbert 52: */ 53: public final class UnitType implements Serializable { 54: 55: /** For serialization. */ 56: private static final long serialVersionUID = 6531925392288519884L; 57: 58: /** Absolute. */ 59: public static final UnitType ABSOLUTE = new UnitType("UnitType.ABSOLUTE"); 60: 61: /** Relative. */ 62: public static final UnitType RELATIVE = new UnitType("UnitType.RELATIVE"); 63: 64: /** The name. */ 65: private String name; 66: 67: /** 68: * Private constructor. 69: * 70: * @param name the name. 71: */ 72: private UnitType(final String name) { 73: this.name = name; 74: } 75: 76: /** 77: * Returns a string representing the object. 78: * 79: * @return The string. 80: */ 81: public String toString() { 82: return this.name; 83: } 84: 85: /** 86: * Returns <code>true</code> if this object is equal to the specified 87: * object, and <code>false</code> otherwise. 88: * 89: * @param obj the other object. 90: * 91: * @return A boolean. 92: */ 93: public boolean equals(final Object obj) { 94: if (obj == this) { 95: return true; 96: } 97: if (!(obj instanceof UnitType)) { 98: return false; 99: } 100: final UnitType that = (UnitType) obj; 101: if (!this.name.equals(that.name)) { 102: return false; 103: } 104: return true; 105: } 106: 107: /** 108: * Returns a hash code value for the object. 109: * 110: * @return The hashcode 111: */ 112: public int hashCode() { 113: return this.name.hashCode(); 114: } 115: 116: /** 117: * Ensures that serialization returns the unique instances. 118: * 119: * @return The object. 120: * 121: * @throws ObjectStreamException if there is a problem. 122: */ 123: private Object readResolve() throws ObjectStreamException { 124: if (this.equals(UnitType.ABSOLUTE)) { 125: return UnitType.ABSOLUTE; 126: } 127: else if (this.equals(UnitType.RELATIVE)) { 128: return UnitType.RELATIVE; 129: } 130: return null; 131: } 132: 133: }