org.springframework.objenesis.instantiator.sun.UnsafeFactoryInstantiator Maven / Gradle / Ivy
/*
* Copyright 2006-2021 the original author or authors.
*
* 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 org.springframework.objenesis.instantiator.sun;
import sun.misc.Unsafe;
import org.springframework.objenesis.ObjenesisException;
import org.springframework.objenesis.instantiator.ObjectInstantiator;
import org.springframework.objenesis.instantiator.annotations.Instantiator;
import org.springframework.objenesis.instantiator.annotations.Typology;
import org.springframework.objenesis.instantiator.util.UnsafeUtils;
/**
* Instantiates an object, WITHOUT calling it's constructor, using
* {@code sun.misc.Unsafe.allocateInstance()}. Unsafe and its methods are implemented by most
* modern JVMs.
*
* @author Henri Tremblay
* @see ObjectInstantiator
*/
@SuppressWarnings("restriction")
@Instantiator(Typology.STANDARD)
public class UnsafeFactoryInstantiator implements ObjectInstantiator {
private final Unsafe unsafe;
private final Class type;
public UnsafeFactoryInstantiator(Class type) {
this.unsafe = UnsafeUtils.getUnsafe(); // retrieve it to fail right away at instantiator creation if not there
this.type = type;
}
public T newInstance() {
try {
return type.cast(unsafe.allocateInstance(type));
} catch (InstantiationException e) {
throw new ObjenesisException(e);
}
}
}