manifold.ext.rt.extensions.java.lang.Object.ManObjectExt Maven / Gradle / Ivy
/*
* Copyright (c) 2020 - Manifold Systems LLC
*
* 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 manifold.ext.rt.extensions.java.lang.Object;
import manifold.ext.rt.api.*;
import java.lang.reflect.Array;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
@Extension
public class ManObjectExt
{
private static final Map classToEmptyArray = new ConcurrentHashMap<>();
/**
* Use this method to type-safely access private and other inaccessible members of the receiver of the call.
* @see Jailbreak
*/
public static @Jailbreak @Self Object jailbreak( @This Object thiz )
{
return thiz;
}
/**
* Get a cached empty array value for this class. Use this method to avoid calling {@code new Foobar[0]} in your code.
*
* Foobar[] empty = Foobar.emptyArray();
*
*/
public static E[] emptyArray( @ThisClass Class callingClass )
{
return (E[])classToEmptyArray.computeIfAbsent( callingClass, key -> Array.newInstance( key, 0 ) );
}
}