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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This 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 software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.remoting3.remote;

import java.io.Serializable;

/**
 * An equals-comparator.
 *
 * @param  the type to compare
 * @author David M. Lloyd
 */
interface Equaller {

    /**
     * Test the two objects for equality.
     *
     * @param obj the object to compare
     * @param other the other object
     * @return {@code true} if they are equivalent, {@code false} otherwise
     */
    boolean equals(T obj, T other);

    Equaller IDENTITY = new IdentityEqualler();

    Equaller DEFAULT = new DefaultEqualler();
}

class IdentityEqualler implements Equaller, Serializable {

    private static final long serialVersionUID = -749526530940615408L;

    public boolean equals(final Object obj, final Object other) {
        return obj == other;
    }

    protected Object readResolve() {
        return Equaller.IDENTITY;
    }
}

class DefaultEqualler implements Equaller, Serializable {

    private static final long serialVersionUID = -5237758393814640207L;

    public boolean equals(final Object obj, final Object other) {
        return obj == null ? other == null : obj.equals(other);
    }

    protected Object readResolve() {
        return Equaller.DEFAULT;
    }
}