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/**
 * 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 ext.test4j.objenesis.strategy;

import ext.test4j.objenesis.instantiator.ObjectInstantiator;
import ext.test4j.objenesis.instantiator.gcj.GCJInstantiator;
import ext.test4j.objenesis.instantiator.jrockit.JRockit131Instantiator;
import ext.test4j.objenesis.instantiator.jrockit.JRockitLegacyInstantiator;
import ext.test4j.objenesis.instantiator.perc.PercInstantiator;
import ext.test4j.objenesis.instantiator.sun.Sun13Instantiator;
import ext.test4j.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
 * 
 * JVM version
 * JVM vendor
 * JVM vendor version
 * 
 * However, instantiators are stateful and so dedicated to their class.
 * 
 * @author Henri Tremblay
 * @see ObjectInstantiator
 */
@SuppressWarnings("rawtypes")
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);
	}
}