Source Code Cross Referenced for TickUnit.java in  » Chart » jfreechart » org » jfree » chart » axis » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Chart » jfreechart » org.jfree.chart.axis 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ===========================================================
002:         * JFreeChart : a free chart library for the Java(tm) platform
003:         * ===========================================================
004:         *
005:         * (C) Copyright 2000-2007, 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:         * TickUnit.java
029:         * -------------
030:         * (C) Copyright 2001-2005, by Object Refinery Limited.
031:         *
032:         * Original Author:  David Gilbert (for Object Refinery Limited);
033:         * Contributor(s):   -;
034:         *
035:         * $Id: TickUnit.java,v 1.3.2.3 2007/06/11 11:09:25 mungady Exp $
036:         *
037:         * Changes (from 19-Dec-2001)
038:         * --------------------------
039:         * 19-Dec-2001 : Added standard header (DG);
040:         * 01-May-2002 : Changed the unit size from Number to double (DG);
041:         * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);
042:         * 08-Nov-2002 : Moved to new package com.jrefinery.chart.axis (DG);
043:         * 26-Mar-2003 : Implemented Serializable (DG);
044:         * 05-Sep-2005 : Implemented hashCode(), thanks to Thomas Morgner (DG);
045:         *
046:         */
047:
048:        package org.jfree.chart.axis;
049:
050:        import java.io.Serializable;
051:
052:        /**
053:         * Base class representing a tick unit.  This determines the spacing of the
054:         * tick marks on an axis.
055:         * <P>
056:         * This class (and any subclasses) should be immutable, the reason being that
057:         * ORDERED collections of tick units are maintained and if one instance can be
058:         * changed, it may destroy the order of the collection that it belongs to.
059:         * In addition, if the implementations are immutable, they can belong to
060:         * multiple collections.
061:         *
062:         * @see ValueAxis
063:         */
064:        public abstract class TickUnit implements  Comparable, Serializable {
065:
066:            /** For serialization. */
067:            private static final long serialVersionUID = 510179855057013974L;
068:
069:            /** The size of the tick unit. */
070:            private double size;
071:
072:            /**
073:             * Constructs a new tick unit.
074:             *
075:             * @param size  the tick unit size.
076:             */
077:            public TickUnit(double size) {
078:                this .size = size;
079:            }
080:
081:            /**
082:             * Returns the size of the tick unit.
083:             *
084:             * @return The size of the tick unit.
085:             */
086:            public double getSize() {
087:                return this .size;
088:            }
089:
090:            /**
091:             * Converts the supplied value to a string.
092:             * <P>
093:             * Subclasses may implement special formatting by overriding this method.
094:             *
095:             * @param value  the data value.
096:             *
097:             * @return Value as string.
098:             */
099:            public String valueToString(double value) {
100:                return String.valueOf(value);
101:            }
102:
103:            /**
104:             * Compares this tick unit to an arbitrary object.
105:             *
106:             * @param object  the object to compare against.
107:             *
108:             * @return <code>1</code> if the size of the other object is less than this,
109:             *      <code>0</code> if both have the same size and <code>-1</code> this
110:             *      size is less than the others.
111:             */
112:            public int compareTo(Object object) {
113:
114:                if (object instanceof  TickUnit) {
115:                    TickUnit other = (TickUnit) object;
116:                    if (this .size > other.getSize()) {
117:                        return 1;
118:                    } else if (this .size < other.getSize()) {
119:                        return -1;
120:                    } else {
121:                        return 0;
122:                    }
123:                } else {
124:                    return -1;
125:                }
126:
127:            }
128:
129:            /**
130:             * Tests this unit for equality with another object.
131:             *
132:             * @param obj  the object.
133:             *
134:             * @return <code>true</code> or <code>false</code>.
135:             */
136:            public boolean equals(Object obj) {
137:
138:                if (obj == null) {
139:                    return false;
140:                }
141:                if (obj == this ) {
142:                    return true;
143:                }
144:                if (obj instanceof  TickUnit) {
145:                    TickUnit tu = (TickUnit) obj;
146:                    return this .size == tu.size;
147:                }
148:                return false;
149:
150:            }
151:
152:            /**
153:             * Returns a hash code for this instance.
154:             * 
155:             * @return A hash code.
156:             */
157:            public int hashCode() {
158:                long temp = this .size != +0.0d ? Double
159:                        .doubleToLongBits(this .size) : 0L;
160:                return (int) (temp ^ (temp >>> 32));
161:            }
162:
163:        }
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