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A general programming library in Java

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/*
 * Copyright (C) 2015 HaiYang Li
 *
 * 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.landawn.abacus.util;

/**
 * 
 * @since 0.8
 * 
 * @author Haiyang Li
 */
public final class Holder extends Reference> {
    public Holder() {
        this(null);
    }

    Holder(T value) {
        super(value);
    }

    public static  Holder of(T value) {
        return new Holder<>(value);
    }

    public static final class R extends Reference> {
        public R() {
            this(null);
        }

        R(T value) {
            super(value);
        }

        public static  R of(T value) {
            return new R<>(value);
        }
    }
}