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/*
 * Copyright 2021-2024 the original author or authors.
 *
 * 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.metaeffekt.artifact.analysis.utils;

public class LazySupplier implements ThrowingSupplier {

    private final ThrowingSupplier supplier;
    private T value;
    private volatile boolean initialized = false;

    public LazySupplier(ThrowingSupplier supplier) {
        this.supplier = supplier;
    }

    @Override
    public T getThrows() throws Exception {
        if (!initialized) {
            synchronized (this) {
                if (!initialized) {
                    value = supplier.getThrows();
                    initialized = true;
                }
            }
        }
        return value;
    }
}