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/*
 * Copyright 2006-2024 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.android.Android10Instantiator;
import org.objenesis.instantiator.android.Android17Instantiator;
import org.objenesis.instantiator.android.Android18Instantiator;
import org.objenesis.instantiator.basic.AccessibleInstantiator;
import org.objenesis.instantiator.basic.ObjectInputStreamInstantiator;
import org.objenesis.instantiator.gcj.GCJInstantiator;
import org.objenesis.instantiator.perc.PercInstantiator;
import org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator;
import org.objenesis.instantiator.sun.UnsafeFactoryInstantiator;

import java.io.Serializable;

import static org.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)) { // 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); } }




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