lang/java/android/src/main/java/org/apache/avro/util/internal/ThreadLocalWithInitial.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.avro.util.internal;

import java.util.function.Supplier;

/**
 * Wraps a {@link ThreadLocal#withInitial(Supplier)} so it can be overridden in
 * an android environment, where this method is not available until API 26.
 */
public class ThreadLocalWithInitial {

  /** Delegate a ThreadLocal instance with the supplier. */
  @SuppressWarnings("AnonymousHasLambdaAlternative")
  public static <T> ThreadLocal<T> of(Supplier<? extends T> supplier) {
    return new ThreadLocal<T>() {
      @Override
      protected T initialValue() {
        return supplier.get();
      }
    };
  }
}