| /** |
| * Copyright 2006-2017 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.objenesis.instantiator.sun; |
| |
| import sun.misc.Unsafe; |
| import org.objenesis.ObjenesisException; |
| import org.objenesis.instantiator.ObjectInstantiator; |
| import org.objenesis.instantiator.annotations.Instantiator; |
| import org.objenesis.instantiator.annotations.Typology; |
| |
| import java.lang.reflect.Field; |
| |
| /** |
| * Instantiates an object, WITHOUT calling it's constructor, using |
| * 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<T> implements ObjectInstantiator<T> { |
| |
| private static Unsafe unsafe; |
| private final Class<T> type; |
| |
| public UnsafeFactoryInstantiator(Class<T> type) { |
| if (unsafe == null) { |
| Field f; |
| try { |
| f = Unsafe.class.getDeclaredField("theUnsafe"); |
| } catch (NoSuchFieldException e) { |
| throw new ObjenesisException(e); |
| } |
| f.setAccessible(true); |
| try { |
| unsafe = (Unsafe) f.get(null); |
| } catch (IllegalAccessException e) { |
| throw new ObjenesisException(e); |
| } |
| } |
| this.type = type; |
| } |
| |
| public T newInstance() { |
| try { |
| return type.cast(unsafe.allocateInstance(type)); |
| } catch (InstantiationException e) { |
| throw new ObjenesisException(e); |
| } |
| } |
| } |