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jfreechart example source code file (AxisLocation.java)

This example jfreechart source code file (AxisLocation.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

axislocation, axislocation, bottom_or_right, illegalargumentexception, illegalstateexception, io, object, object, objectstreamexception, serializable, string, string, top_or_left, top_or_right, top_or_right

The jfreechart AxisLocation.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.]
 *
 * -----------------
 * AxisLocation.java
 * -----------------
 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Nick Guenther;
 *
 * Changes:
 * --------
 * 02-May-2003 : Version 1 (DG);
 * 03-Jul-2003 : Added isTopOrBottom() and isLeftOrRight() methods (DG);
 * 13-Aug-2003 : Fixed readResolve() bug (id=788202) (DG);
 * 24-Mar-2004 : Added static getOpposite() method (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 22-Mar-2007 : Added getOpposite() method, suggested by Nick Guenther (DG);
 *
 */

package org.jfree.chart.axis;

import java.io.ObjectStreamException;
import java.io.Serializable;

/**
 * Used to indicate the location of an axis on a 2D plot, prior to knowing the
 * orientation of the plot.
 */
public final class AxisLocation implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -3276922179323563410L;

    /** Axis at the top or left. */
    public static final AxisLocation TOP_OR_LEFT = new AxisLocation(
            "AxisLocation.TOP_OR_LEFT");

    /** Axis at the top or right. */
    public static final AxisLocation TOP_OR_RIGHT = new AxisLocation(
            "AxisLocation.TOP_OR_RIGHT");

    /** Axis at the bottom or left. */
    public static final AxisLocation BOTTOM_OR_LEFT = new AxisLocation(
            "AxisLocation.BOTTOM_OR_LEFT");

    /** Axis at the bottom or right. */
    public static final AxisLocation BOTTOM_OR_RIGHT = new AxisLocation(
            "AxisLocation.BOTTOM_OR_RIGHT");

    /** The name. */
    private String name;

    /**
     * Private constructor.
     *
     * @param name  the name.
     */
    private AxisLocation(String name) {
        this.name = name;
    }

    /**
     * Returns the location that is opposite to this location.
     *
     * @return The opposite location.
     *
     * @since 1.0.5
     */
    public AxisLocation getOpposite() {
        return getOpposite(this);
    }

    /**
     * Returns a string representing the object.
     *
     * @return The string.
     */
    public String toString() {
        return this.name;
    }

    /**
     * Returns <code>true if this object is equal to the specified
     * object, and <code>false otherwise.
     *
     * @param obj  the other object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {

        if (this == obj) {
            return true;
        }
        if (!(obj instanceof AxisLocation)) {
            return false;
        }
        AxisLocation location = (AxisLocation) obj;
        if (!this.name.equals(location.toString())) {
            return false;
        }
        return true;

    }

    /**
     * Returns the location that is opposite to the supplied location.
     *
     * @param location  the location (<code>null not permitted).
     *
     * @return The opposite location.
     */
    public static AxisLocation getOpposite(AxisLocation location) {
        if (location == null) {
            throw new IllegalArgumentException("Null 'location' argument.");
        }
        AxisLocation result = null;
        if (location == AxisLocation.TOP_OR_LEFT) {
            result = AxisLocation.BOTTOM_OR_RIGHT;
        }
        else if (location == AxisLocation.TOP_OR_RIGHT) {
            result = AxisLocation.BOTTOM_OR_LEFT;
        }
        else if (location == AxisLocation.BOTTOM_OR_LEFT) {
            result = AxisLocation.TOP_OR_RIGHT;
        }
        else if (location == AxisLocation.BOTTOM_OR_RIGHT) {
            result = AxisLocation.TOP_OR_LEFT;
        }
        else {
            throw new IllegalStateException("AxisLocation not recognised.");
        }
        return result;
    }

    /**
     * Ensures that serialization returns the unique instances.
     *
     * @return The object.
     *
     * @throws ObjectStreamException if there is a problem.
     */
    private Object readResolve() throws ObjectStreamException {
        if (this.equals(AxisLocation.TOP_OR_RIGHT)) {
            return AxisLocation.TOP_OR_RIGHT;
        }
        else if (this.equals(AxisLocation.BOTTOM_OR_RIGHT)) {
            return AxisLocation.BOTTOM_OR_RIGHT;
        }
        else if (this.equals(AxisLocation.TOP_OR_LEFT)) {
            return AxisLocation.TOP_OR_LEFT;
        }
        else if (this.equals(AxisLocation.BOTTOM_OR_LEFT)) {
            return AxisLocation.BOTTOM_OR_LEFT;
        }
        return null;
    }

}

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