/**
* Copyright 2006-2013 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.android;
import java.io.ObjectStreamClass;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.objenesis.ObjenesisException;
import org.objenesis.instantiator.ObjectInstantiator;
/**
* Instantiator for Android API level 11 to 17 which creates objects without driving their
* constructors, using internal methods on the Dalvik implementation of {@link ObjectStreamClass}.
*
* @author Ian Parkinson (Google Inc.)
*/
public class Android17Instantiator<T> implements ObjectInstantiator<T> {
private final Class<T> type;
private final Method newInstanceMethod;
private final Integer objectConstructorId;
public Android17Instantiator(Class<T> type) {
this.type = type;
newInstanceMethod = getNewInstanceMethod();
objectConstructorId = findConstructorIdForJavaLangObjectConstructor();
}
public T newInstance() {
try {
return type.cast(newInstanceMethod.invoke(null, type, objectConstructorId));
}
catch(Exception e) {
throw new ObjenesisException(e);
}
}
private static Method getNewInstanceMethod() {
try {
Method newInstanceMethod = ObjectStreamClass.class.getDeclaredMethod(
"newInstance", Class.class, Integer.TYPE);
newInstanceMethod.setAccessible(true);
return newInstanceMethod;
}
catch(RuntimeException e) {
throw new ObjenesisException(e);
}
catch(NoSuchMethodException e) {
throw new ObjenesisException(e);
}
}
private static Integer findConstructorIdForJavaLangObjectConstructor() {
try {
Method newInstanceMethod = ObjectStreamClass.class.getDeclaredMethod(
"getConstructorId", Class.class);
newInstanceMethod.setAccessible(true);
return (Integer) newInstanceMethod.invoke(null, Object.class);
}
catch(RuntimeException e) {
throw new ObjenesisException(e);
}
catch(NoSuchMethodException e) {
throw new ObjenesisException(e);
}
catch(IllegalAccessException e) {
throw new ObjenesisException(e);
}
catch(InvocationTargetException e) {
throw new ObjenesisException(e);
}
}
}