uk.co.real_logic.artio.util.Lazy Maven / Gradle / Ivy

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/*
 * Copyright 2020 Monotonic Ltd.
 *
 * 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
 *
 * https://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 uk.co.real_logic.artio.util;

import java.util.function.Supplier;

public final class Lazy implements Supplier
{
    private final Supplier factory;
    private T value;

    public Lazy(final Supplier factory)
    {
        this.factory = factory;
    }

    public T get()
    {
        if (value == null)
        {
            value = factory.get();
        }

        return value;
    }
}