Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: EqualsHashcode.java Sprache: JAVA

/*
* Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/*
* @test
* @bug 6210287
* @summary Verifies that the various utility shapes implement
*          the equals(Object) and hashCode methods adequately
*/

import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RoundRectangle2D;
import java.util.Vector;

public class EqualsHashcode {
    public static final int NUMTESTS = 1000;

    public static void main(String argv[]) {
        new FloatRectangleTester().test();
        new DoubleRectangleTester().test();

        new FloatEllipseTester().test();
        new DoubleEllipseTester().test();

        new FloatArcTester().test();
        new DoubleArcTester().test();

        new FloatRoundRectTester().test();
        new DoubleRoundRectTester().test();
    }

    /**
     * Base utility class for random parameters for testing
     */
    public static abstract class Val {
        protected String name;

        protected Val(String name) {
            this.name = name;
        }

        public abstract Object save();
        public abstract void restore(Object save);

        public abstract void randomize();
        public abstract void perturb();
    }

    /**
     * Base subclass for parameters with "special" values (Infinity, NaN, etc.)
     */
    public static abstract class SpecialVal extends Val {
        protected SpecialVal(String name) {
            super(name);
        }

        public abstract void setSpecial();

        public abstract boolean isNaN();
    }

    /**
     * Floating point parameter
     */
    public static class FloatVal extends SpecialVal {
        private float v;

        public FloatVal(String name) {
            super(name);
        }

        public float getVal() {
            return v;
        }

        public String toString() {
            return name+" = "+v+" (flt)";
        }

        public Object save() {
            return new Float(v);
        }

        public void restore(Object o) {
            v = ((Float) o).floatValue();
        }

        public void randomize() {
            v = (float) (Math.random() * 100);
        }

        public void perturb() {
            v = v + 1;
        }

        public boolean hasSpecialCases() {
            return true;
        }

        public void setSpecial() {
            switch ((int) (Math.random() * 3)) {
            case 0:
                v = Float.NaN;
                break;
            case 1:
                v = Float.POSITIVE_INFINITY;
                break;
            case 2:
                v = Float.NEGATIVE_INFINITY;
                break;
            default:
                throw new InternalError();
            }
        }

        public boolean isNaN() {
            return (v != v);
        }
    }

    /**
     * Double precision parameter
     */
    public static class DoubleVal extends SpecialVal {
        private double v;

        public DoubleVal(String name) {
            super(name);
        }

        public double getVal() {
            return v;
        }

        public String toString() {
            return name+" = "+v+" (dbl)";
        }

        public Object save() {
            return new Double(v);
        }

        public void restore(Object o) {
            v = ((Double) o).doubleValue();
        }

        public void randomize() {
            v = Math.random() * 100;
        }

        public void perturb() {
            v = v + 1;
        }

        public boolean hasSpecialCases() {
            return true;
        }

        public void setSpecial() {
            switch ((int) (Math.random() * 3)) {
            case 0:
                v = Double.NaN;
                break;
            case 1:
                v = Double.POSITIVE_INFINITY;
                break;
            case 2:
                v = Double.NEGATIVE_INFINITY;
                break;
            default:
                throw new InternalError();
            }
        }

        public boolean isNaN() {
            return (v != v);
        }
    }

    /**
     * Integer value with a specified min/max range.
     */
    public static class IntRangeVal extends Val {
        public int v;
        public int min;
        public int max;

        public IntRangeVal(String name, int min, int max) {
            super(name);
            this.min = min;
            this.max = max;
        }

        public int getVal() {
            return v;
        }

        public String toString() {
            return name+" = "+v;
        }

        public Object save() {
            return new Integer(v);
        }

        public void restore(Object o) {
            v = ((Integer) o).intValue();
        }

        public void randomize() {
            v = min + (int) (Math.random() * (max-min+1));
        }

        public void perturb() {
            v = v + 1;
            if (v > max) {
                v = min;
            }
        }
    }

    /**
     * Base class for testing a given type of shape.
     * Subclasses must register all of their "parameters" which
     * need to be randomized, specialized, and perturbed for
     * testing.
     * Subclasses must also implement makeShape() which makes
     * a new shape object according to the current values of
     * all of their parameters.
     */
    public static abstract class ShapeTester {
        public Vector params = new Vector();

        public void addParam(Val v) {
            params.add(v);
        }

        public Val[] getParamArray() {
            Val ret[] = new Val[params.size()];
            for (int i = 0; i < params.size(); i++) {
                ret[i] = (Val) params.get(i);
            }
            return ret;
        }

        public void error(String desc) {
            Val params[] = getParamArray();
            for (int j = 0; j < params.length; j++) {
                System.err.println(params[j]);
            }
            throw new RuntimeException(desc);
        }

        public abstract Object makeShape();

        public void test() {
            Val params[] = getParamArray();
            for (int i = 0; i < NUMTESTS; i++) {
                // First, randomize all parameters
                for (int j = 0; j < params.length; j++) {
                    params[j].randomize();
                }

                // Now make 2 copies from the same params and verify equals()
                Object o1 = makeShape();
                if (!o1.equals(o1)) {
                    error("Shapes not equal to itself!");
                }
                Object o2 = makeShape();
                if (!o1.equals(o2)) {
                    error("Identical shapes not equal!");
                }
                if (o1.hashCode() != o2.hashCode()) {
                    error("Identical hashes not equal!");
                }

                // Now perturb the params 1 by 1 and verify !equals()
                for (int j = 0; j < params.length; j++) {
                    Val param = params[j];
                    Object save = param.save();

                    param.perturb();
                    Object o3 = makeShape();
                    if (o1.equals(o3)) {
                        error("Perturbed shape still equal!");
                    }

                    // If param has "special values", test them as well
                    if (param instanceof SpecialVal) {
                        SpecialVal sparam = (SpecialVal) param;
                        sparam.setSpecial();
                        Object o4 = makeShape();
                        if (o1.equals(o4)) {
                            error("Specialized shape still equal!");
                        }
                        Object o5 = makeShape();
                        // objects equal iff param is not a NaN
                        if (o4.equals(o5) == sparam.isNaN()) {
                            error("Identical specialized shapes not equal!");
                        }
                        // hash codes always equal, even if NaN
                        // (Note: equals()/hashCode() contract allows this)
                        if (o4.hashCode() != o5.hashCode()) {
                            error("Identical specialized hashes not equal!");
                        }
                    }

                    // Restore original value of param and make sure
                    param.restore(save);
                    Object o6 = makeShape();
                    if (!o1.equals(o6)) {
                        error("Restored shape not equal!");
                    }
                    if (o1.hashCode() != o6.hashCode()) {
                        error("Restored hash not equal!");
                    }
                }
            }
        }
    }

    /**
     * Base tester class for objects with floating point xywh bounds
     */
    public static abstract class FloatBoundedShape extends ShapeTester {
        public FloatVal x = new FloatVal("x");
        public FloatVal y = new FloatVal("y");
        public FloatVal w = new FloatVal("w");
        public FloatVal h = new FloatVal("h");

        public FloatBoundedShape() {
            addParam(x);
            addParam(y);
            addParam(w);
            addParam(h);
        }
    }

    /**
     * Base tester class for objects with double precision xywh bounds
     */
    public static abstract class DoubleBoundedShape extends ShapeTester {
        public DoubleVal x = new DoubleVal("x");
        public DoubleVal y = new DoubleVal("y");
        public DoubleVal w = new DoubleVal("w");
        public DoubleVal h = new DoubleVal("h");

        public DoubleBoundedShape() {
            addParam(x);
            addParam(y);
            addParam(w);
            addParam(h);
        }
    }

    public static class FloatRectangleTester extends FloatBoundedShape {
        public Object makeShape() {
            return new Rectangle2D.Float(x.getVal(), y.getVal(),
                                         w.getVal(), h.getVal());
        }
    }

    public static class DoubleRectangleTester extends DoubleBoundedShape {
        public Object makeShape() {
            return new Rectangle2D.Double(x.getVal(), y.getVal(),
                                          w.getVal(), h.getVal());
        }
    }

    public static class FloatEllipseTester extends FloatBoundedShape {
        public Object makeShape() {
            return new Ellipse2D.Float(x.getVal(), y.getVal(),
                                       w.getVal(), h.getVal());
        }
    }

    public static class DoubleEllipseTester extends DoubleBoundedShape {
        public Object makeShape() {
            return new Ellipse2D.Double(x.getVal(), y.getVal(),
                                        w.getVal(), h.getVal());
        }
    }

    public static class FloatArcTester extends FloatBoundedShape {
        public FloatVal start = new FloatVal("start");
        public FloatVal extent = new FloatVal("extent");
        public IntRangeVal type = new IntRangeVal("type", 0, 2);

        public FloatArcTester() {
            addParam(start);
            addParam(extent);
            addParam(type);
        }

        public Object makeShape() {
            return new Arc2D.Float(x.getVal(), y.getVal(),
                                   w.getVal(), h.getVal(),
                                   start.getVal(), extent.getVal(),
                                   type.getVal());
        }
    }

    public static class DoubleArcTester extends DoubleBoundedShape {
        public DoubleVal start = new DoubleVal("start");
        public DoubleVal extent = new DoubleVal("extent");
        public IntRangeVal type = new IntRangeVal("type", 0, 2);

        public DoubleArcTester() {
            addParam(start);
            addParam(extent);
            addParam(type);
        }

        public Object makeShape() {
            return new Arc2D.Double(x.getVal(), y.getVal(),
                                    w.getVal(), h.getVal(),
                                    start.getVal(), extent.getVal(),
                                    type.getVal());
        }
    }

    public static class FloatRoundRectTester extends FloatBoundedShape {
        public FloatVal arcw = new FloatVal("arcw");
        public FloatVal arch = new FloatVal("arch");

        public FloatRoundRectTester() {
            addParam(arcw);
            addParam(arch);
        }

        public Object makeShape() {
            return new RoundRectangle2D.Float(x.getVal(), y.getVal(),
                                              w.getVal(), h.getVal(),
                                              arcw.getVal(), arch.getVal());
        }
    }

    public static class DoubleRoundRectTester extends DoubleBoundedShape {
        public DoubleVal arcw = new DoubleVal("arcw");
        public DoubleVal arch = new DoubleVal("arch");

        public DoubleRoundRectTester() {
            addParam(arcw);
            addParam(arch);
        }

        public Object makeShape() {
            return new RoundRectangle2D.Double(x.getVal(), y.getVal(),
                                               w.getVal(), h.getVal(),
                                               arcw.getVal(), arch.getVal());
        }
    }
}

¤ Dauer der Verarbeitung: 0.25 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.