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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: * Layer.java 29: * ---------- 30: * (C) Copyright 2003, 2004, by Object Refinery Limited. 31: * 32: * Original Author: David Gilbert (for Object Refinery Limited); 33: * Contributor(s): -; 34: * 35: * $Id: Layer.java,v 1.4 2005/10/18 13:18:34 mungady Exp $ 36: * 37: * Changes: 38: * -------- 39: * 17-Sep-2003 (DG); 40: * 41: */ 42: 43: package org.jfree.ui; 44: 45: import java.io.ObjectStreamException; 46: import java.io.Serializable; 47: 48: /** 49: * Used to indicate either the foreground or background layer. 50: * 51: * @author David Gilbert 52: */ 53: public final class Layer implements Serializable { 54: 55: /** For serialization. */ 56: private static final long serialVersionUID = -1470104570733183430L; 57: 58: /** Foreground. */ 59: public static final Layer FOREGROUND = new Layer("Layer.FOREGROUND"); 60: 61: /** Background. */ 62: public static final Layer BACKGROUND = new Layer("Layer.BACKGROUND"); 63: 64: /** The name. */ 65: private String name; 66: 67: /** 68: * Private constructor. 69: * 70: * @param name the name. 71: */ 72: private Layer(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 o the other object. 90: * 91: * @return A boolean. 92: */ 93: public boolean equals(final Object o) { 94: 95: if (this == o) { 96: return true; 97: } 98: if (!(o instanceof Layer)) { 99: return false; 100: } 101: 102: final Layer layer = (Layer) o; 103: if (!this.name.equals(layer.name)) { 104: return false; 105: } 106: 107: return true; 108: 109: } 110: 111: /** 112: * Returns a hash code value for the object. 113: * 114: * @return the hashcode 115: */ 116: public int hashCode() { 117: return this.name.hashCode(); 118: } 119: 120: /** 121: * Ensures that serialization returns the unique instances. 122: * 123: * @return The object. 124: * 125: * @throws ObjectStreamException if there is a problem. 126: */ 127: private Object readResolve() throws ObjectStreamException { 128: Layer result = null; 129: if (this.equals(Layer.FOREGROUND)) { 130: result = Layer.FOREGROUND; 131: } 132: else if (this.equals(Layer.BACKGROUND)) { 133: result = Layer.BACKGROUND; 134: } 135: return result; 136: } 137: 138: }