com.mycila.maven.plugin.license.util.Fn Maven / Gradle / Ivy

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Maven 2 plugin to check and update license headers in source files

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/*
 * Copyright (C) 2008-2024 Mycila ([email protected])
 *
 * 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 com.mycila.maven.plugin.license.util;

import java.util.function.Supplier;

public class Fn {

  public static  Supplier memoize(Supplier supplier) {
    return new Supplier() {
      private T value;
      private boolean resolved;

      @Override
      public T get() {
        if (!resolved) {
          value = supplier.get();
          resolved = true;
        }
        return value;
      }
    };
  }
}