org.apache.avro.util.internal.ClassValueCache Maven / Gradle / Ivy
/*
* 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 Return type of the ClassValue
*/
public class ClassValueCache implements Function, R> {
private final Function, R> ifAbsent;
private final ClassValue cache = new ClassValue() {
@Override
protected R computeValue(Class c) {
return ifAbsent.apply(c);
}
};
public ClassValueCache(Function, R> ifAbsent) {
this.ifAbsent = ifAbsent;
}
@Override
public R apply(Class c) {
return cache.get(c);
}
}