RadialGradientPaintKey.java

/* =====================================================================
 * OrsonPDF : a fast, light-weight PDF library for the Java(tm) platform
 * =====================================================================
 * 
 * (C)opyright 2013-2015, by Object Refinery Limited.  All rights reserved.
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 * it under the terms of the GNU General Public License as published by
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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package com.orsonpdf.util;

import java.awt.RadialGradientPaint;
import java.util.Arrays;

/**
 * A wrapper for a {@code RadialGradientPaint} that can be used as the key 
 * for a {@code HashMap}.  This class is used internally by 
 * {@code PDFGraphics2D} to track and re-use gradient definitions.  
 * {@code RadialGradientPaint} itself does not implement the {@code equals()}
 * and {@code hashCode()} methods, so it doesn't make a good key for a 
 * {@code Map}.
 */
public class RadialGradientPaintKey {
    
    private RadialGradientPaint paint;
    
    float f = 0.0f;
    
    /**
     * Creates a new key instance.
     * 
     * @param rgp  the radial gradient paint ({@code null} not permitted).
     */
    public RadialGradientPaintKey(RadialGradientPaint rgp) {
        Args.nullNotPermitted(rgp, "rgp");
        this.paint = rgp;
    }

    /**
     * Returns the {@code RadialGradientPaint} that was supplied to the 
     * constructor.
     * 
     * @return The {@code RadialGradientPaint} (never {@code null}). 
     */
    public RadialGradientPaint getPaint() {
        return this.paint;
    }
    
    /**
     * Tests this instance for equality with an arbitrary object.
     * 
     * @param obj  the object to test ({@code null} permitted).
     * 
     * @return A boolean.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (! (obj instanceof RadialGradientPaint)) {
            return false;
        }
        RadialGradientPaint that = (RadialGradientPaint) obj;
        if (!this.paint.getCenterPoint().equals(that.getCenterPoint())) {
            return false;
        }
        if (!this.paint.getFocusPoint().equals(that.getCenterPoint())) {
            return false;
        }
        if (!Arrays.equals(this.paint.getColors(), that.getColors())) {
            return false;
        }
        if (!Arrays.equals(this.paint.getFractions(), that.getFractions())) {
            return false;
        }
        return true;
    }
    
    /**
     * Returns a hash code for this instance.
     * 
     * @return A hash code. 
     */
    @Override
    public int hashCode() {
        int hash = 5;
        hash = 47 * hash + this.paint.getCenterPoint().hashCode();
        hash = 47 * hash + this.paint.getFocusPoint().hashCode();
        hash = 47 * hash + Float.floatToIntBits(this.paint.getRadius());
        hash = 47 * hash + Arrays.hashCode(this.paint.getColors());
        hash = 47 * hash + Arrays.hashCode(this.paint.getFractions());
        return hash;
    }

}