Objects.java

/*
 *      Copyright (C) 2012, 2016  higherfrequencytrading.com
 *      Copyright (C) 2016 Roman Leventov
 *
 *      This program 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 3 of the License.
 *
 *      This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.openhft.chronicle.hash.impl.util;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Arrays;

/**
 * java.util.Objects since Java 7
 */
public final class Objects {
    public static int hash(Object... values) {
        return Arrays.hashCode(values);
    }

    public static boolean equal(@Nullable Object a, @Nullable Object b) {
        return a != null ? a.equals(b) : b == null;
    }

    public static boolean builderEquals(@NotNull Object builder, @Nullable Object o) {
        return builder == o ||
                o != null && builder.getClass() == o.getClass() &&
                        builder.toString().equals(o.toString());
    }

    public static void requireNonNull(Object obj) {
        if (obj == null)
            throw new NullPointerException();
    }
    
    private Objects() {}
}