/**
* 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.strategy;
import org.objenesis.instantiator.ObjectInstantiator;
import org.objenesis.instantiator.gcj.GCJInstantiator;
import org.objenesis.instantiator.jrockit.JRockit131Instantiator;
import org.objenesis.instantiator.jrockit.JRockitLegacyInstantiator;
import org.objenesis.instantiator.perc.PercInstantiator;
import org.objenesis.instantiator.sun.Sun13Instantiator;
import org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator;
/**
* Guess the best instantiator for a given class. The instantiator will instantiate the class
* without calling any constructor. Currently, the selection doesn't depend on the class. It relies
* on the
* <ul>
* <li>JVM version</li>
* <li>JVM vendor</li>
* <li>JVM vendor version</li>
* </ul>
* However, instantiators are stateful and so dedicated to their class.
*
* @author Henri Tremblay
* @see ObjectInstantiator
*/
public class StdInstantiatorStrategy extends BaseInstantiatorStrategy {
/**
* Return an {@link ObjectInstantiator} allowing to create instance without any constructor being
* called.
*
* @param type Class to instantiate
* @return The ObjectInstantiator for the class
*/
public ObjectInstantiator newInstantiatorOf(Class type) {
if(JVM_NAME.startsWith(SUN)) {
if(VM_VERSION.startsWith("1.3")) {
return new Sun13Instantiator(type);
}
}
else if(JVM_NAME.startsWith(JROCKIT)) {
if(VM_VERSION.startsWith("1.3")) {
return new JRockit131Instantiator(type);
}
else if(VM_VERSION.startsWith("1.4")) {
// JRockit vendor version will be RXX where XX is the version
// Versions prior to 26 need special handling
// From R26 on, java.vm.version starts with R
if(!VENDOR_VERSION.startsWith("R")) {
// On R25.1 and R25.2, ReflectionFactory should work. Otherwise, we must use the
// Legacy instantiator.
if(VM_INFO == null || !VM_INFO.startsWith("R25.1") || !VM_INFO.startsWith("R25.2")) {
return new JRockitLegacyInstantiator(type);
}
}
}
}
else if(JVM_NAME.startsWith(GNU)) {
return new GCJInstantiator(type);
}
else if(JVM_NAME.startsWith(PERC)) {
return new PercInstantiator(type);
}
// Fallback instantiator, should work with:
// - Java Hotspot version 1.4 and higher
// - JRockit 1.4-R26 and higher
// - IBM and Hitachi JVMs
// ... might works for others so we just give it a try
return new SunReflectionFactoryInstantiator(type);
}
}