/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * 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 com.hazelcast.concurrent.atomicreference;

import com.hazelcast.nio.serialization.Data;

public class AtomicReferenceContainer {

    private Data value;

    public Data get() {
        return value;
    }

    public void set(Data value) {
        this.value = value;
    }

    public boolean compareAndSet(Data expect, Data value) {
        if (!contains(expect)) {
            return false;
        }
        this.value = value;
        return true;
    }

    public boolean contains(Data expected) {
        if (value == null) {
            return expected == null;
        }
        return value.equals(expected);
    }

    public Data getAndSet(Data value) {
        Data tempValue = this.value;
        this.value = value;
        return tempValue;
    }

    public boolean isNull() {
        return value == null;
    }
}