AffinePoint.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 *
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package sun.security.ec.point;

import sun.security.util.math.ImmutableIntegerModuloP;

import java.util.Objects;

/**
 * Elliptic curve point represented using affine coordinates (x, y). This class
 * is not part of the sun.security.ec.point.Point hierarchy because it is not
 * used to hold intermediate values during point arithmetic, and so it does not
 * have a mutable form.
 */
public class AffinePoint {

    private final ImmutableIntegerModuloP x;
    private final ImmutableIntegerModuloP y;

    public AffinePoint(ImmutableIntegerModuloP x, ImmutableIntegerModuloP y) {
        this.x = x;
        this.y = y;
    }

    public ImmutableIntegerModuloP getX() {
        return x;
    }

    public ImmutableIntegerModuloP getY() {
        return y;
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof AffinePoint)) {
            return false;
        }
        AffinePoint p = (AffinePoint) obj;
        boolean xEquals = x.asBigInteger().equals(p.x.asBigInteger());
        boolean yEquals = y.asBigInteger().equals(p.y.asBigInteger());
        return xEquals && yEquals;
    }

    @Override
    public int hashCode() {
        return Objects.hash(x, y);
    }

    @Override
    public String toString() {
        return "(" + x.asBigInteger().toString() + "," +
            y.asBigInteger().toString() + ")";
    }
}