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: * CategoryAnchor.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: CategoryAnchor.java,v 1.4.2.1 2005/10/25 20:37:34 mungady Exp $
036: *
037: * Changes:
038: * --------
039: * 04-Jul-2003 : Version 1 (DG);
040: *
041: */
042:
043: package org.jfree.chart.axis;
044:
045: import java.io.ObjectStreamException;
046: import java.io.Serializable;
047:
048: /**
049: * Used to indicate one of three positions within a category:
050: * <code>START</code>, <code>MIDDLE</code> and <code>END</code>.
051: */
052: public final class CategoryAnchor implements Serializable {
053:
054: /** For serialization. */
055: private static final long serialVersionUID = -2604142742210173810L;
056:
057: /** Start of period. */
058: public static final CategoryAnchor START = new CategoryAnchor(
059: "CategoryAnchor.START");
060:
061: /** Middle of period. */
062: public static final CategoryAnchor MIDDLE = new CategoryAnchor(
063: "CategoryAnchor.MIDDLE");
064:
065: /** End of period. */
066: public static final CategoryAnchor END = new CategoryAnchor(
067: "CategoryAnchor.END");
068:
069: /** The name. */
070: private String name;
071:
072: /**
073: * Private constructor.
074: *
075: * @param name the name.
076: */
077: private CategoryAnchor(String name) {
078: this .name = name;
079: }
080:
081: /**
082: * Returns a string representing the object.
083: *
084: * @return The string.
085: */
086: public String toString() {
087: return this .name;
088: }
089:
090: /**
091: * Returns <code>true</code> if this object is equal to the specified
092: * object, and <code>false</code> otherwise.
093: *
094: * @param obj the other object.
095: *
096: * @return A boolean.
097: */
098: public boolean equals(Object obj) {
099:
100: if (this == obj) {
101: return true;
102: }
103: if (!(obj instanceof CategoryAnchor)) {
104: return false;
105: }
106: CategoryAnchor position = (CategoryAnchor) obj;
107: if (!this .name.equals(position.toString())) {
108: return false;
109: }
110: return true;
111:
112: }
113:
114: /**
115: * Ensures that serialization returns the unique instances.
116: *
117: * @return The object.
118: *
119: * @throws ObjectStreamException if there is a problem.
120: */
121: private Object readResolve() throws ObjectStreamException {
122: if (this.equals(CategoryAnchor.START)) {
123: return CategoryAnchor.START;
124: } else if (this.equals(CategoryAnchor.MIDDLE)) {
125: return CategoryAnchor.MIDDLE;
126: } else if (this.equals(CategoryAnchor.END)) {
127: return CategoryAnchor.END;
128: }
129: return null;
130: }
131:
132: }
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