Objects.java

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2010, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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 org.jboss.solder.util.collections;

public class Objects {

    private Objects() {
    }

    /**
     * Determines whether two possibly-null objects are equal. Returns:
     * <p/>
     * <ul>
     * <li>{@code true} if {@code a} and {@code b} are both null.
     * <li>{@code true} if {@code a} and {@code b} are both non-null and they are
     * equal according to {@link Object#equals(Object)}.
     * <li>{@code false} in all other situations.
     * </ul>
     * <p/>
     * <p/>
     * This assumes that any non-null objects passed to this function conform to
     * the {@code equals()} contract.
     */
    public static boolean equal(Object a, Object b) {
        return a == b || (a != null && a.equals(b));
    }

}