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jfreechart example source code file (Range.java)

This example jfreechart source code file (Range.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

illegalargumentexception, illegalargumentexception, io, negative, null, null, range, range, serializable, string, string

The jfreechart Range.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.]
 *
 * ----------
 * Range.java
 * ----------
 * (C) Copyright 2002-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Chuanhao Chiu;
 *                   Bill Kelemen;
 *                   Nicolas Brodu;
 *                   Sergei Ivanov;
 *
 * Changes (from 23-Jun-2001)
 * --------------------------
 * 22-Apr-2002 : Version 1, loosely based by code by Bill Kelemen (DG);
 * 30-Apr-2002 : Added getLength() and getCentralValue() methods.  Changed
 *               argument check in constructor (DG);
 * 13-Jun-2002 : Added contains(double) method (DG);
 * 22-Aug-2002 : Added fix to combine method where both ranges are null, thanks
 *               to Chuanhao Chiu for reporting and fixing this (DG);
 * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 14-Aug-2003 : Added equals() method (DG);
 * 27-Aug-2003 : Added toString() method (BK);
 * 11-Sep-2003 : Added Clone Support (NB);
 * 23-Sep-2003 : Fixed Checkstyle issues (DG);
 * 25-Sep-2003 : Oops, Range immutable, clone not necessary (NB);
 * 05-May-2004 : Added constrain() and intersects() methods (DG);
 * 18-May-2004 : Added expand() method (DG);
 * ------------- JFreeChart 1.0.x ---------------------------------------------
 * 11-Jan-2006 : Added new method expandToInclude(Range, double) (DG);
 * 18-Dec-2007 : New methods intersects(Range) and scale(...) thanks to Sergei
 *               Ivanov (DG);
 *
 */

package org.jfree.data;

import java.io.Serializable;

/**
 * Represents an immutable range of values.
 */
public strictfp class Range implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -906333695431863380L;

    /** The lower bound of the range. */
    private double lower;

    /** The upper bound of the range. */
    private double upper;

    /**
     * Creates a new range.
     *
     * @param lower  the lower bound (must be <= upper bound).
     * @param upper  the upper bound (must be >= lower bound).
     */
    public Range(double lower, double upper) {
        if (lower > upper) {
            String msg = "Range(double, double): require lower (" + lower
                + ") <= upper (" + upper + ").";
            throw new IllegalArgumentException(msg);
        }
        this.lower = lower;
        this.upper = upper;
    }

    /**
     * Returns the lower bound for the range.
     *
     * @return The lower bound.
     */
    public double getLowerBound() {
        return this.lower;
    }

    /**
     * Returns the upper bound for the range.
     *
     * @return The upper bound.
     */
    public double getUpperBound() {
        return this.upper;
    }

    /**
     * Returns the length of the range.
     *
     * @return The length.
     */
    public double getLength() {
        return this.upper - this.lower;
    }

    /**
     * Returns the central value for the range.
     *
     * @return The central value.
     */
    public double getCentralValue() {
        return this.lower / 2.0 + this.upper / 2.0;
    }

    /**
     * Returns <code>true if the range contains the specified value and
     * <code>false otherwise.
     *
     * @param value  the value to lookup.
     *
     * @return <code>true if the range contains the specified value.
     */
    public boolean contains(double value) {
        return (value >= this.lower && value <= this.upper);
    }

    /**
     * Returns <code>true if the range intersects with the specified
     * range, and <code>false otherwise.
     *
     * @param b0  the lower bound (should be <= b1).
     * @param b1  the upper bound (should be >= b0).
     *
     * @return A boolean.
     */
    public boolean intersects(double b0, double b1) {
        if (b0 <= this.lower) {
            return (b1 > this.lower);
        }
        else {
            return (b0 < this.upper && b1 >= b0);
        }
    }

    /**
     * Returns <code>true if the range intersects with the specified
     * range, and <code>false otherwise.
     *
     * @param range  another range (<code>null not permitted).
     *
     * @return A boolean.
     *
     * @since 1.0.9
     */
    public boolean intersects(Range range) {
        return intersects(range.getLowerBound(), range.getUpperBound());
    }

    /**
     * Returns the value within the range that is closest to the specified
     * value.
     *
     * @param value  the value.
     *
     * @return The constrained value.
     */
    public double constrain(double value) {
        double result = value;
        if (!contains(value)) {
            if (value > this.upper) {
                result = this.upper;
            }
            else if (value < this.lower) {
                result = this.lower;
            }
        }
        return result;
    }

    /**
     * Creates a new range by combining two existing ranges.
     * <P>
     * Note that:
     * <ul>
     *   <li>either range can be null, in which case the other
     *       range is returned;</li>
     *   <li>if both ranges are null the return value is
     *       <code>null.
     * </ul>
     *
     * @param range1  the first range (<code>null permitted).
     * @param range2  the second range (<code>null permitted).
     *
     * @return A new range (possibly <code>null).
     */
    public static Range combine(Range range1, Range range2) {
        if (range1 == null) {
            return range2;
        }
        else {
            if (range2 == null) {
                return range1;
            }
            else {
                double l = Math.min(range1.getLowerBound(),
                        range2.getLowerBound());
                double u = Math.max(range1.getUpperBound(),
                        range2.getUpperBound());
                return new Range(l, u);
            }
        }
    }

    /**
     * Returns a range that includes all the values in the specified
     * <code>range AND the specified value.
     *
     * @param range  the range (<code>null permitted).
     * @param value  the value that must be included.
     *
     * @return A range.
     *
     * @since 1.0.1
     */
    public static Range expandToInclude(Range range, double value) {
        if (range == null) {
            return new Range(value, value);
        }
        if (value < range.getLowerBound()) {
            return new Range(value, range.getUpperBound());
        }
        else if (value > range.getUpperBound()) {
            return new Range(range.getLowerBound(), value);
        }
        else {
            return range;
        }
    }

    /**
     * Creates a new range by adding margins to an existing range.
     *
     * @param range  the range (<code>null not permitted).
     * @param lowerMargin  the lower margin (expressed as a percentage of the
     *                     range length).
     * @param upperMargin  the upper margin (expressed as a percentage of the
     *                     range length).
     *
     * @return The expanded range.
     */
    public static Range expand(Range range,
                               double lowerMargin, double upperMargin) {
        if (range == null) {
            throw new IllegalArgumentException("Null 'range' argument.");
        }
        double length = range.getLength();
        double lower = range.getLowerBound() - length * lowerMargin;
        double upper = range.getUpperBound() + length * upperMargin;
        if (lower > upper) {
            lower = lower / 2.0 + upper / 2.0;
            upper = lower;
        }
        return new Range(lower, upper);
    }

    /**
     * Shifts the range by the specified amount.
     *
     * @param base  the base range (<code>null not permitted).
     * @param delta  the shift amount.
     *
     * @return A new range.
     */
    public static Range shift(Range base, double delta) {
        return shift(base, delta, false);
    }

    /**
     * Shifts the range by the specified amount.
     *
     * @param base  the base range (<code>null not permitted).
     * @param delta  the shift amount.
     * @param allowZeroCrossing  a flag that determines whether or not the
     *                           bounds of the range are allowed to cross
     *                           zero after adjustment.
     *
     * @return A new range.
     */
    public static Range shift(Range base, double delta,
                              boolean allowZeroCrossing) {
        if (base == null) {
            throw new IllegalArgumentException("Null 'base' argument.");
        }
        if (allowZeroCrossing) {
            return new Range(base.getLowerBound() + delta,
                    base.getUpperBound() + delta);
        }
        else {
            return new Range(shiftWithNoZeroCrossing(base.getLowerBound(),
                    delta), shiftWithNoZeroCrossing(base.getUpperBound(),
                    delta));
        }
    }

    /**
     * Returns the given <code>value adjusted by delta but
     * with a check to prevent the result from crossing <code>0.0.
     *
     * @param value  the value.
     * @param delta  the adjustment.
     *
     * @return The adjusted value.
     */
    private static double shiftWithNoZeroCrossing(double value, double delta) {
        if (value > 0.0) {
            return Math.max(value + delta, 0.0);
        }
        else if (value < 0.0) {
            return Math.min(value + delta, 0.0);
        }
        else {
            return value + delta;
        }
    }

    /**
     * Scales the range by the specified factor.
     *
     * @param base the base range (<code>null not permitted).
     * @param factor the scaling factor (must be non-negative).
     *
     * @return A new range.
     *
     * @since 1.0.9
     */
    public static Range scale(Range base, double factor) {
        if (base == null) {
            throw new IllegalArgumentException("Null 'base' argument.");
        }
        if (factor < 0) {
            throw new IllegalArgumentException("Negative 'factor' argument.");
        }
        return new Range(base.getLowerBound() * factor,
                base.getUpperBound() * factor);
    }

    /**
     * Tests this object for equality with an arbitrary object.
     *
     * @param obj  the object to test against (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (!(obj instanceof Range)) {
            return false;
        }
        Range range = (Range) obj;
        if (!(this.lower == range.lower)) {
            return false;
        }
        if (!(this.upper == range.upper)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result;
        long temp;
        temp = Double.doubleToLongBits(this.lower);
        result = (int) (temp ^ (temp >>> 32));
        temp = Double.doubleToLongBits(this.upper);
        result = 29 * result + (int) (temp ^ (temp >>> 32));
        return result;
    }

    /**
     * Returns a string representation of this Range.
     *
     * @return A String "Range[lower,upper]" where lower=lower range and
     *         upper=upper range.
     */
    public String toString() {
        return ("Range[" + this.lower + "," + this.upper + "]");
    }

}

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