content: /*
   * 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.Function;
  
  /**
   * Wraps a {@link ClassValue} cache so it can be overridden in an android
   * environment, where it isn't available.
   *
   * @param <R> Return type of the ClassValue
   */
  public class ClassValueCache<R> implements Function<Class<?>, R> {
  
    private final Function<Class<?>, R> ifAbsent;
  
    private final ClassValue<R> cache = new ClassValue<R>() {
      @Override
      protected R computeValue(Class<?> c) {
        return ifAbsent.apply(c);
      }
    };
  
    public ClassValueCache(Function<Class<?>, R> ifAbsent) {
      this.ifAbsent = ifAbsent;
    }
  
    @Override
    public R apply(Class<?> c) {
      return cache.get(c);
    }
  }
  