001: /* ===========================================================
002: * JFreeChart : a free chart library for the Java(tm) platform
003: * ===========================================================
004: *
005: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006: *
007: * Project Info: http://www.jfree.org/jfreechart/index.html
008: *
009: * This library is free software; you can redistribute it and/or modify it
010: * under the terms of the GNU Lesser General Public License as published by
011: * the Free Software Foundation; either version 2.1 of the License, or
012: * (at your option) any later version.
013: *
014: * This library is distributed in the hope that it will be useful, but
015: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017: * License for more details.
018: *
019: * You should have received a copy of the GNU Lesser General Public
020: * License along with this library; if not, write to the Free Software
021: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022: * USA.
023: *
024: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025: * in the United States and other countries.]
026: *
027: * ----------------
028: * DomainOrder.java
029: * ----------------
030: * (C) Copyright 2004, 2005, by Object Refinery Limited.
031: *
032: * Original Author: David Gilbert (for Object Refinery Limited);
033: * Contributor(s): -;
034: *
035: * $Id: DomainOrder.java,v 1.4.2.1 2005/10/25 21:29:13 mungady Exp $
036: *
037: * Changes:
038: * --------
039: * 29-Jul-2004 : Version 1 (DG);
040: *
041: */
042:
043: package org.jfree.data;
044:
045: import java.io.ObjectStreamException;
046: import java.io.Serializable;
047:
048: /**
049: * Used to indicate sorting order if any (ascending, descending or none).
050: */
051: public final class DomainOrder implements Serializable {
052:
053: /** For serialization. */
054: private static final long serialVersionUID = 4902774943512072627L;
055:
056: /** No order. */
057: public static final DomainOrder NONE = new DomainOrder(
058: "DomainOrder.NONE");
059:
060: /** Ascending order. */
061: public static final DomainOrder ASCENDING = new DomainOrder(
062: "DomainOrder.ASCENDING");
063:
064: /** Descending order. */
065: public static final DomainOrder DESCENDING = new DomainOrder(
066: "DomainOrder.DESCENDING");
067:
068: /** The name. */
069: private String name;
070:
071: /**
072: * Private constructor.
073: *
074: * @param name the name.
075: */
076: private DomainOrder(String name) {
077: this .name = name;
078: }
079:
080: /**
081: * Returns a string representing the object.
082: *
083: * @return The string.
084: */
085: public String toString() {
086: return this .name;
087: }
088:
089: /**
090: * Returns <code>true</code> if this object is equal to the specified
091: * object, and <code>false</code> otherwise.
092: *
093: * @param obj the other object.
094: *
095: * @return A boolean.
096: */
097: public boolean equals(Object obj) {
098:
099: if (this == obj) {
100: return true;
101: }
102: if (!(obj instanceof DomainOrder)) {
103: return false;
104: }
105: DomainOrder that = (DomainOrder) obj;
106: if (!this .name.equals(that.toString())) {
107: return false;
108: }
109: return true;
110: }
111:
112: /**
113: * Returns a hash code value for the object.
114: *
115: * @return The hashcode
116: */
117: public int hashCode() {
118: return this .name.hashCode();
119: }
120:
121: /**
122: * Ensures that serialization returns the unique instances.
123: *
124: * @return The object.
125: *
126: * @throws ObjectStreamException if there is a problem.
127: */
128: private Object readResolve() throws ObjectStreamException {
129: if (this.equals(DomainOrder.ASCENDING)) {
130: return DomainOrder.ASCENDING;
131: } else if (this.equals(DomainOrder.DESCENDING)) {
132: return DomainOrder.DESCENDING;
133: } else if (this.equals(DomainOrder.NONE)) {
134: return DomainOrder.NONE;
135: }
136: return null;
137: }
138:
139: }
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