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: * TimePeriodAnchor.java
029: * ---------------------
030: * (C) Copyright 2003, 2005, by Object Refinery Limited.
031: *
032: * Original Author: David Gilbert (for Object Refinery Limited);
033: * Contributor(s): -;
034: *
035: * $Id: TimePeriodAnchor.java,v 1.5.2.1 2005/10/25 21:35:24 mungady Exp $
036: *
037: * Changes:
038: * --------
039: * 30-Jul-2003 : Version 1 (DG);
040: * 01-Mar-2004 : Added readResolve() method (DG);
041: *
042: */
043:
044: package org.jfree.data.time;
045:
046: import java.io.ObjectStreamException;
047: import java.io.Serializable;
048:
049: /**
050: * Used to indicate one of three positions in a time period:
051: * <code>START</code>, <code>MIDDLE</code> and <code>END</code>.
052: */
053: public final class TimePeriodAnchor implements Serializable {
054:
055: /** For serialization. */
056: private static final long serialVersionUID = 2011955697457548862L;
057:
058: /** Start of period. */
059: public static final TimePeriodAnchor START = new TimePeriodAnchor(
060: "TimePeriodAnchor.START");
061:
062: /** Middle of period. */
063: public static final TimePeriodAnchor MIDDLE = new TimePeriodAnchor(
064: "TimePeriodAnchor.MIDDLE");
065:
066: /** End of period. */
067: public static final TimePeriodAnchor END = new TimePeriodAnchor(
068: "TimePeriodAnchor.END");
069:
070: /** The name. */
071: private String name;
072:
073: /**
074: * Private constructor.
075: *
076: * @param name the name.
077: */
078: private TimePeriodAnchor(String name) {
079: this .name = name;
080: }
081:
082: /**
083: * Returns a string representing the object.
084: *
085: * @return The string.
086: */
087: public String toString() {
088: return this .name;
089: }
090:
091: /**
092: * Returns <code>true</code> if this object is equal to the specified
093: * object, and <code>false</code> otherwise.
094: *
095: * @param obj the other object.
096: *
097: * @return A boolean.
098: */
099: public boolean equals(Object obj) {
100:
101: if (this == obj) {
102: return true;
103: }
104: if (!(obj instanceof TimePeriodAnchor)) {
105: return false;
106: }
107:
108: TimePeriodAnchor position = (TimePeriodAnchor) obj;
109: if (!this .name.equals(position.name)) {
110: return false;
111: }
112:
113: return true;
114: }
115:
116: /**
117: * Returns a hash code value for the object.
118: *
119: * @return The hashcode
120: */
121: public int hashCode() {
122: return this .name.hashCode();
123: }
124:
125: /**
126: * Ensures that serialization returns the unique instances.
127: *
128: * @return The object.
129: *
130: * @throws ObjectStreamException if there is a problem.
131: */
132: private Object readResolve() throws ObjectStreamException {
133: if (this.equals(TimePeriodAnchor.START)) {
134: return TimePeriodAnchor.START;
135: } else if (this.equals(TimePeriodAnchor.MIDDLE)) {
136: return TimePeriodAnchor.MIDDLE;
137: } else if (this.equals(TimePeriodAnchor.END)) {
138: return TimePeriodAnchor.END;
139: }
140: return null;
141: }
142:
143: }
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