java.util.Objects Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2016 Carlos Ballesteros Velasco
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package java.util;

public final class Objects {
    private Objects() {
        throw new AssertionError("No java.util.Objects instances for you!");
    }

    public static boolean equals(Object a, Object b) {
        return (a == b) || (a != null && a.equals(b));
    }

    public static boolean deepEquals(Object a, Object b) {
        if (a == b) return true;
        if (a == null || b == null) return false;
        return Arrays.deepEquals0(a, b);
    }

    public static int hashCode(Object o) {
        return o != null ? o.hashCode() : 0;
    }

    public static int hash(Object... values) {
        return Arrays.hashCode(values);
    }

    public static String toString(Object o) {
        return toString(o, "null");
    }

    public static String toString(Object o, String nullDefault) {
        return (o != null) ? o.toString() : nullDefault;
    }

    public static  int compare(T a, T b, Comparator c) {
        return (a == b) ? 0 : c.compare(a, b);
    }

    public static  T requireNonNull(T obj) {
        if (obj == null) throw new NullPointerException();
        return obj;
    }

    public static  T requireNonNull(T obj, String message) {
        if (obj == null) throw new NullPointerException(message);
        return obj;
    }
}