org.jfree.chart.ui.GradientPaintTransformType Maven / Gradle / Ivy

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JFreeChart is a class library, written in Java, for generating charts. Utilising the Java2D APIs, it currently supports bar charts, pie charts, line charts, XY-plots and time series plots.
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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2020, 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.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 */

package org.jfree.chart.ui;

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

/**
 * Represents a type of transform for a {@code GradientPaint}.
 */
public final class GradientPaintTransformType implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 8331561784933982450L;
    
    /** Vertical. */
    public static final GradientPaintTransformType VERTICAL 
        = new GradientPaintTransformType("GradientPaintTransformType.VERTICAL");

    /** Horizontal. */
    public static final GradientPaintTransformType HORIZONTAL 
        = new GradientPaintTransformType(
                "GradientPaintTransformType.HORIZONTAL");

    /** Center/vertical. */
    public static final GradientPaintTransformType CENTER_VERTICAL 
        = new GradientPaintTransformType(
                "GradientPaintTransformType.CENTER_VERTICAL");

    /** Center/horizontal. */
    public static final GradientPaintTransformType CENTER_HORIZONTAL 
        = new GradientPaintTransformType(
                "GradientPaintTransformType.CENTER_HORIZONTAL");
        
    /** The name. */
    private String name;

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

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

    /**
     * Returns {@code true} if this object is equal to the specified 
     * object, and {@code false} otherwise.
     *
     * @param o  the other object.
     *
     * @return A boolean.
     */
    @Override
    public boolean equals(Object o) {

        if (this == o) {
            return true;
        }
        if (!(o instanceof GradientPaintTransformType)) {
            return false;
        }

        final GradientPaintTransformType t = (GradientPaintTransformType) o;
        if (!this.name.equals(t.name)) {
            return false;
        }

        return true;
    }

    /**
     * Returns a hash code value for the object.
     *
     * @return the hashcode
     */
    @Override
    public int hashCode() {
        return this.name.hashCode();
    }

    /**
     * Ensures that serialization returns the unique instances.
     * 
     * @return The object.
     * 
     * @throws ObjectStreamException if there is a problem.
     */
    private Object readResolve() throws ObjectStreamException {
        GradientPaintTransformType result = null;
        if (this.equals(GradientPaintTransformType.HORIZONTAL)) {
            result = GradientPaintTransformType.HORIZONTAL;
        }
        else if (this.equals(GradientPaintTransformType.VERTICAL)) {
            result = GradientPaintTransformType.VERTICAL;
        }
        else if (this.equals(GradientPaintTransformType.CENTER_HORIZONTAL)) {
            result = GradientPaintTransformType.CENTER_HORIZONTAL;
        }
        else if (this.equals(GradientPaintTransformType.CENTER_VERTICAL)) {
            result = GradientPaintTransformType.CENTER_VERTICAL;
        }
        return result;
    }
    
}