Source Code Cross Referenced for DefaultKeyedValueDataset.java in  » Chart » jfreechart » org » jfree » data » general » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Chart » jfreechart » org.jfree.data.general 
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 2000-2005, 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:         * DefaultKeyedValueDataset.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 $
036:         *
037:         * Changes
038:         * -------
039:         * 27-Mar-2003 : Version 1 (DG);
040:         * 18-Aug-2003 : Implemented Cloneable (DG);
041:         *
042:         */
043:
044:        package org.jfree.data.general;
045:
046:        import java.io.Serializable;
047:
048:        import org.jfree.data.DefaultKeyedValue;
049:        import org.jfree.data.KeyedValue;
050:        import org.jfree.util.ObjectUtilities;
051:
052:        /**
053:         * A default implementation of the {@link KeyedValueDataset} interface.
054:         */
055:        public class DefaultKeyedValueDataset extends AbstractDataset implements 
056:                KeyedValueDataset, Serializable {
057:
058:            /** For serialization. */
059:            private static final long serialVersionUID = -8149484339560406750L;
060:
061:            /** Storage for the data. */
062:            private KeyedValue data;
063:
064:            /**
065:             * Constructs a new dataset, initially empty.
066:             */
067:            public DefaultKeyedValueDataset() {
068:                this (null);
069:            }
070:
071:            /**
072:             * Creates a new dataset with the specified initial value.
073:             *
074:             * @param key  the key.
075:             * @param value  the value (<code>null</code> permitted).
076:             */
077:            public DefaultKeyedValueDataset(Comparable key, Number value) {
078:                this (new DefaultKeyedValue(key, value));
079:            }
080:
081:            /**
082:             * Creates a new dataset that uses the data from a {@link KeyedValue} 
083:             * instance.
084:             *
085:             * @param data  the data (<code>null</code> permitted).
086:             */
087:            public DefaultKeyedValueDataset(KeyedValue data) {
088:                this .data = data;
089:            }
090:
091:            /**
092:             * Returns the key associated with the value, or <code>null</code> if the 
093:             * dataset has no data item.
094:             *
095:             * @return The key.
096:             */
097:            public Comparable getKey() {
098:                Comparable result = null;
099:                if (this .data != null) {
100:                    result = this .data.getKey();
101:                }
102:                return result;
103:            }
104:
105:            /**
106:             * Returns the value.
107:             *
108:             * @return The value (possibly <code>null</code>).
109:             */
110:            public Number getValue() {
111:                Number result = null;
112:                if (this .data != null) {
113:                    result = this .data.getValue();
114:                }
115:                return result;
116:            }
117:
118:            /**
119:             * Updates the value.
120:             *
121:             * @param value  the new value (<code>null</code> permitted).
122:             */
123:            public void updateValue(Number value) {
124:                if (this .data == null) {
125:                    throw new RuntimeException(
126:                            "updateValue: can't update null.");
127:                }
128:                setValue(this .data.getKey(), value);
129:            }
130:
131:            /**
132:             * Sets the value for the dataset and sends a {@link DatasetChangeEvent} to 
133:             * all registered listeners.
134:             *
135:             * @param key  the key.
136:             * @param value  the value (<code>null</code> permitted).
137:             */
138:            public void setValue(Comparable key, Number value) {
139:                this .data = new DefaultKeyedValue(key, value);
140:                notifyListeners(new DatasetChangeEvent(this , this ));
141:            }
142:
143:            /**
144:             * Tests this dataset for equality with an arbitrary object.
145:             *
146:             * @param obj  the object.
147:             *
148:             * @return A boolean.
149:             */
150:            public boolean equals(Object obj) {
151:
152:                if (obj == this ) {
153:                    return true;
154:                }
155:                if (!(obj instanceof  KeyedValueDataset)) {
156:                    return false;
157:                }
158:                KeyedValueDataset that = (KeyedValueDataset) obj;
159:                if (this .data == null) {
160:                    if (that.getKey() != null || that.getValue() != null) {
161:                        return false;
162:                    }
163:                    return true;
164:                }
165:                if (!ObjectUtilities.equal(this .data.getKey(), that.getKey())) {
166:                    return false;
167:                }
168:                if (!ObjectUtilities.equal(this .data.getValue(), that
169:                        .getValue())) {
170:                    return false;
171:                }
172:                return true;
173:            }
174:
175:            /**
176:             * Returns a hash code.
177:             * 
178:             * @return A hash code.
179:             */
180:            public int hashCode() {
181:                return (this .data != null ? this .data.hashCode() : 0);
182:            }
183:
184:            /**
185:             * Creates a clone of the dataset.
186:             * 
187:             * @return A clone.
188:             * 
189:             * @throws CloneNotSupportedException This class will not throw this 
190:             *         exception, but subclasses (if any) might.
191:             */
192:            public Object clone() throws CloneNotSupportedException {
193:                DefaultKeyedValueDataset clone = (DefaultKeyedValueDataset) super
194:                        .clone();
195:                return clone;
196:            }
197:
198:        }
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