org.springframework.objenesis.strategy.StdInstantiatorStrategy Maven / Gradle / Ivy
/*
* Copyright 2006-2022 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.springframework.objenesis.strategy;
import org.springframework.objenesis.instantiator.ObjectInstantiator;
import org.springframework.objenesis.instantiator.android.Android10Instantiator;
import org.springframework.objenesis.instantiator.android.Android17Instantiator;
import org.springframework.objenesis.instantiator.android.Android18Instantiator;
import org.springframework.objenesis.instantiator.basic.AccessibleInstantiator;
import org.springframework.objenesis.instantiator.basic.ObjectInputStreamInstantiator;
import org.springframework.objenesis.instantiator.gcj.GCJInstantiator;
import org.springframework.objenesis.instantiator.perc.PercInstantiator;
import org.springframework.objenesis.instantiator.sun.SunReflectionFactoryInstantiator;
import org.springframework.objenesis.instantiator.sun.UnsafeFactoryInstantiator;
import java.io.Serializable;
import static org.springframework.objenesis.strategy.PlatformDescription.*;
/**
* 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
*
* - JVM version
* - JVM vendor
* - JVM vendor version
*
* 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(PlatformDescription.isThisJVM(HOTSPOT) || PlatformDescription.isThisJVM(OPENJDK)) {
// Java 7 GAE was under a security manager so we use a degraded system
if(PlatformDescription.isGoogleAppEngine() && PlatformDescription.SPECIFICATION_VERSION.equals("1.7")) {
if(Serializable.class.isAssignableFrom(type)) {
return new ObjectInputStreamInstantiator<>(type);
}
return new AccessibleInstantiator<>(type);
}
// The UnsafeFactoryInstantiator would also work. But according to benchmarks, it is 2.5
// times slower. So I prefer to use this one
return new SunReflectionFactoryInstantiator<>(type);
}
else if(PlatformDescription.isThisJVM(DALVIK)) {
if(PlatformDescription.isAndroidOpenJDK()) {
// Starting at Android N which is based on OpenJDK
return new UnsafeFactoryInstantiator<>(type);
}
if(ANDROID_VERSION <= 10) {
// Android 2.3 Gingerbread and lower
return new Android10Instantiator<>(type);
}
if(ANDROID_VERSION <= 17) {
// Android 3.0 Honeycomb to 4.2 Jelly Bean
return new Android17Instantiator<>(type);
}
// Android 4.3 until Android N
return new Android18Instantiator<>(type);
}
else if(PlatformDescription.isThisJVM(GNU)) {
return new GCJInstantiator<>(type);
}
else if(PlatformDescription.isThisJVM(PERC)) {
return new PercInstantiator<>(type);
}
// Fallback instantiator, should work with most modern JVM
return new UnsafeFactoryInstantiator<>(type);
}
}