/**
* Copyright 2006-2009 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.basic;
import java.io.ObjectStreamClass;
import java.lang.reflect.Method;
import org.objenesis.ObjenesisException;
import org.objenesis.instantiator.ObjectInstantiator;
/**
* Instantiates a class by using reflection to make a call to private method
* ObjectStreamClass.newInstance, present in many JVM implementations. This instantiator will create
* classes in a way compatible with serialization, calling the first non-serializable superclass'
* no-arg constructor.
*
* @author Leonardo Mesquita
* @see ObjectInstantiator
* @see java.io.Serializable
*/
public class ObjectStreamClassInstantiator implements ObjectInstantiator {
private static Method newInstanceMethod;
private static void initialize() {
if(newInstanceMethod == null) {
try {
newInstanceMethod = ObjectStreamClass.class.getDeclaredMethod("newInstance",
new Class[] {});
newInstanceMethod.setAccessible(true);
}
catch(RuntimeException e) {
throw new ObjenesisException(e);
}
catch(NoSuchMethodException e) {
throw new ObjenesisException(e);
}
}
}
private final ObjectStreamClass objStreamClass;
public ObjectStreamClassInstantiator(Class type) {
initialize();
objStreamClass = ObjectStreamClass.lookup(type);
}
public Object newInstance() {
try {
return newInstanceMethod.invoke(objStreamClass, new Object[] {});
}
catch(Exception e) {
throw new ObjenesisException(e);
}
}
}