001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2020, 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 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 *
027 * -----------------
028 * HistogramBin.java
029 * -----------------
030 * (C) Copyright 2003-2008, by Jelai Wang and Contributors.
031 *
032 * Original Author:  Jelai Wang (jelaiw AT mindspring.com);
033 * Contributor(s):   David Gilbert (for Object Refinery Limited);
034 *
035 * Changes
036 * -------
037 * 06-Jul-2003 : Version 1, contributed by Jelai Wang (DG);
038 * 07-Jul-2003 : Changed package and added Javadocs (DG);
039 * 01-Mar-2004 : Moved from org.jfree.data --> org.jfree.data.statistics (DG);
040 * ------------- JFREECHART 1.0.x ---------------------------------------------
041 * 02-Feb-2007 : Removed author tags from all over JFreeChart sources (DG);
042 *
043 */
044
045package org.jfree.data.statistics;
046
047import java.io.Serializable;
048
049/**
050 * A bin for the {@link HistogramDataset} class.
051 */
052public class HistogramBin implements Cloneable, Serializable {
053
054    /** For serialization. */
055    private static final long serialVersionUID = 7614685080015589931L;
056
057    /** The number of items in the bin. */
058    private int count;
059
060    /** The start boundary. */
061    private double startBoundary;
062
063    /** The end boundary. */
064    private double endBoundary;
065
066    /**
067     * Creates a new bin.
068     *
069     * @param startBoundary  the start boundary.
070     * @param endBoundary  the end boundary.
071     */
072    public HistogramBin(double startBoundary, double endBoundary) {
073        if (startBoundary > endBoundary) {
074            throw new IllegalArgumentException(
075                    "HistogramBin():  startBoundary > endBoundary.");
076        }
077        this.count = 0;
078        this.startBoundary = startBoundary;
079        this.endBoundary = endBoundary;
080    }
081
082    /**
083     * Returns the number of items in the bin.
084     *
085     * @return The item count.
086     */
087    public int getCount() {
088        return this.count;
089    }
090
091    /**
092     * Increments the item count.
093     */
094    public void incrementCount() {
095        this.count++;
096    }
097
098    /**
099     * Returns the start boundary.
100     *
101     * @return The start boundary.
102     */
103    public double getStartBoundary() {
104        return this.startBoundary;
105    }
106
107    /**
108     * Returns the end boundary.
109     *
110     * @return The end boundary.
111     */
112    public double getEndBoundary() {
113        return this.endBoundary;
114    }
115
116    /**
117     * Returns the bin width.
118     *
119     * @return The bin width.
120     */
121    public double getBinWidth() {
122        return this.endBoundary - this.startBoundary;
123    }
124
125    /**
126     * Tests this object for equality with an arbitrary object.
127     *
128     * @param obj  the object to test against.
129     *
130     * @return A boolean.
131     */
132    @Override
133    public boolean equals(Object obj) {
134        if (obj == null) {
135            return false;
136        }
137        if (obj == this) {
138            return true;
139        }
140        if (obj instanceof HistogramBin) {
141            HistogramBin bin = (HistogramBin) obj;
142            boolean b0 = bin.startBoundary == this.startBoundary;
143            boolean b1 = bin.endBoundary == this.endBoundary;
144            boolean b2 = bin.count == this.count;
145            return b0 && b1 && b2;
146        }
147        return false;
148    }
149
150    /**
151     * Returns a clone of the bin.
152     *
153     * @return A clone.
154     *
155     * @throws CloneNotSupportedException not thrown by this class.
156     */
157    @Override
158    public Object clone() throws CloneNotSupportedException {
159        return super.clone();
160    }
161
162}