/** | |
* 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.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); | |
} | |
} | |
} |