+++ /dev/null
-/*
- * Copyright (C) 2011 Google Inc.
- *
- * 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 com.google.gson.internal;
-
-import java.io.ObjectInputStream;
-import java.io.ObjectStreamClass;
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-
-/**
- * Do sneaky things to allocate objects without invoking their constructors.
- *
- * @author Joel Leitch
- * @author Jesse Wilson
- */
-public abstract class UnsafeAllocator {
- public abstract <T> T newInstance(Class<T> c) throws Exception;
-
- public static UnsafeAllocator create() {
- // try JVM
- // public class Unsafe {
- // public Object allocateInstance(Class<?> type);
- // }
- try {
- Class<?> unsafeClass = Class.forName("sun.misc.Unsafe");
- Field f = unsafeClass.getDeclaredField("theUnsafe");
- f.setAccessible(true);
- final Object unsafe = f.get(null);
- final Method allocateInstance = unsafeClass.getMethod("allocateInstance", Class.class);
- return new UnsafeAllocator() {
- @Override
- @SuppressWarnings("unchecked")
- public <T> T newInstance(Class<T> c) throws Exception {
- return (T) allocateInstance.invoke(unsafe, c);
- }
- };
- } catch (Exception ignored) {
- }
-
- // try dalvikvm, pre-gingerbread
- // public class ObjectInputStream {
- // private static native Object newInstance(
- // Class<?> instantiationClass, Class<?> constructorClass);
- // }
- try {
- final Method newInstance = ObjectInputStream.class
- .getDeclaredMethod("newInstance", Class.class, Class.class);
- newInstance.setAccessible(true);
- return new UnsafeAllocator() {
- @Override
- @SuppressWarnings("unchecked")
- public <T> T newInstance(Class<T> c) throws Exception {
- return (T) newInstance.invoke(null, c, Object.class);
- }
- };
- } catch (Exception ignored) {
- }
-
- // try dalvikvm, post-gingerbread
- // public class ObjectStreamClass {
- // private static native int getConstructorId(Class<?> c);
- // private static native Object newInstance(Class<?> instantiationClass, int methodId);
- // }
- try {
- Method getConstructorId = ObjectStreamClass.class
- .getDeclaredMethod("getConstructorId", Class.class);
- getConstructorId.setAccessible(true);
- final int constructorId = (Integer) getConstructorId.invoke(null, Object.class);
- final Method newInstance = ObjectStreamClass.class
- .getDeclaredMethod("newInstance", Class.class, int.class);
- newInstance.setAccessible(true);
- return new UnsafeAllocator() {
- @Override
- @SuppressWarnings("unchecked")
- public <T> T newInstance(Class<T> c) throws Exception {
- return (T) newInstance.invoke(null, c, constructorId);
- }
- };
- } catch (Exception ignored) {
- }
-
- // give up
- return new UnsafeAllocator() {
- @Override
- public <T> T newInstance(Class<T> c) {
- throw new UnsupportedOperationException("Cannot allocate " + c);
- }
- };
- }
-}