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jfreechart example source code file (TimePeriodValue.java)

This example jfreechart source code file (TimePeriodValue.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

cloneable, clonenotsupportedexception, illegalargumentexception, io, null, number, number, object, object, serializable, string, timeperiod, timeperiod, timeperiodvalue, timeperiodvalue

The jfreechart TimePeriodValue.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * --------------------
 * TimePeriodValue.java
 * --------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 22-Apr-2003 : Version 1 (DG);
 * 03-Oct-2006 : Added null argument check to constructor (DG);
 * 07-Apr-2008 : Added a toString() override for debugging (DG);
 *
 */

package org.jfree.data.time;

import java.io.Serializable;

/**
 * Represents a time period and an associated value.
 */
public class TimePeriodValue implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 3390443360845711275L;

    /** The time period. */
    private TimePeriod period;

    /** The value associated with the time period. */
    private Number value;

    /**
     * Constructs a new data item.
     *
     * @param period  the time period (<code>null not permitted).
     * @param value  the value associated with the time period.
     *
     * @throws IllegalArgumentException if <code>period is
     *     <code>null.
     */
    public TimePeriodValue(TimePeriod period, Number value) {
        if (period == null) {
            throw new IllegalArgumentException("Null 'period' argument.");
        }
        this.period = period;
        this.value = value;
    }

    /**
     * Constructs a new data item.
     *
     * @param period  the time period (<code>null not permitted).
     * @param value  the value associated with the time period.
     *
     * @throws IllegalArgumentException if <code>period is
     *     <code>null.
     */
    public TimePeriodValue(TimePeriod period, double value) {
        this(period, new Double(value));
    }

    /**
     * Returns the time period.
     *
     * @return The time period (never <code>null).
     */
    public TimePeriod getPeriod() {
        return this.period;
    }

    /**
     * Returns the value.
     *
     * @return The value (possibly <code>null).
     *
     * @see #setValue(Number)
     */
    public Number getValue() {
        return this.value;
    }

    /**
     * Sets the value for this data item.
     *
     * @param value  the new value (<code>null permitted).
     *
     * @see #getValue()
     */
    public void setValue(Number value) {
        this.value = value;
    }

    /**
     * Tests this object for equality with the target object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof TimePeriodValue)) {
            return false;
        }

        TimePeriodValue timePeriodValue = (TimePeriodValue) obj;

        if (this.period != null ? !this.period.equals(timePeriodValue.period)
                : timePeriodValue.period != null) {
            return false;
        }
        if (this.value != null ? !this.value.equals(timePeriodValue.value)
                : timePeriodValue.value != null) {
            return false;
        }

        return true;
    }

    /**
     * Returns a hash code value for the object.
     *
     * @return The hashcode
     */
    public int hashCode() {
        int result;
        result = (this.period != null ? this.period.hashCode() : 0);
        result = 29 * result + (this.value != null ? this.value.hashCode() : 0);
        return result;
    }

    /**
     * Clones the object.
     * <P>
     * Note: no need to clone the period or value since they are immutable
     * classes.
     *
     * @return A clone.
     */
    public Object clone() {
        Object clone = null;
        try {
            clone = super.clone();
        }
        catch (CloneNotSupportedException e) { // won't get here...
            e.printStackTrace();
        }
        return clone;
    }

    /**
     * Returns a string representing this instance, primarily for use in
     * debugging.
     *
     * @return A string.
     */
    public String toString() {
        return "TimePeriodValue[" + getPeriod() + "," + getValue() + "]";
    }

}

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