1 /**
2  * Copyright 2006-2013 the original author or authors.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.objenesis.strategy;
17 
18 import org.objenesis.instantiator.ObjectInstantiator;
19 import org.objenesis.instantiator.android.AndroidInstantiator;
20 import org.objenesis.instantiator.gcj.GCJInstantiator;
21 import org.objenesis.instantiator.jrockit.JRockit131Instantiator;
22 import org.objenesis.instantiator.jrockit.JRockitLegacyInstantiator;
23 import org.objenesis.instantiator.perc.PercInstantiator;
24 import org.objenesis.instantiator.sun.Sun13Instantiator;
25 import org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator;
26 
27 /**
28  * Guess the best instantiator for a given class. The instantiator will instantiate the class
29  * without calling any constructor. Currently, the selection doesn't depend on the class. It relies
30  * on the
31  * <ul>
32  * <li>JVM version</li>
33  * <li>JVM vendor</li>
34  * <li>JVM vendor version</li>
35  * </ul>
36  * However, instantiators are stateful and so dedicated to their class.
37  *
38  * @author Henri Tremblay
39  * @see ObjectInstantiator
40  */
41 public class StdInstantiatorStrategy extends BaseInstantiatorStrategy {
42 
43    /**
44     * Return an {@link ObjectInstantiator} allowing to create instance without any constructor being
45     * called.
46     *
47     * @param type Class to instantiate
48     * @return The ObjectInstantiator for the class
49     */
newInstantiatorOf(Class type)50    public ObjectInstantiator newInstantiatorOf(Class type) {
51 
52       if(JVM_NAME.startsWith(SUN)) {
53          if(VM_VERSION.startsWith("1.3")) {
54             return new Sun13Instantiator(type);
55          }
56       }
57       else if(JVM_NAME.startsWith(JROCKIT)) {
58          if(VM_VERSION.startsWith("1.3")) {
59             return new JRockit131Instantiator(type);
60          }
61          else if(VM_VERSION.startsWith("1.4")) {
62             // JRockit vendor version will be RXX where XX is the version
63             // Versions prior to 26 need special handling
64             // From R26 on, java.vm.version starts with R
65             if(!VENDOR_VERSION.startsWith("R")) {
66                // On R25.1 and R25.2, ReflectionFactory should work. Otherwise, we must use the
67                // Legacy instantiator.
68                if(VM_INFO == null || !VM_INFO.startsWith("R25.1") || !VM_INFO.startsWith("R25.2")) {
69                   return new JRockitLegacyInstantiator(type);
70                }
71             }
72          }
73       }
74       else if(JVM_NAME.startsWith(DALVIK)) {
75          return new AndroidInstantiator(type);
76       }
77       else if(JVM_NAME.startsWith(GNU)) {
78          return new GCJInstantiator(type);
79       }
80       else if(JVM_NAME.startsWith(PERC)) {
81     	  return new PercInstantiator(type);
82       }
83 
84       // Fallback instantiator, should work with:
85       // - Java Hotspot version 1.4 and higher
86       // - JRockit 1.4-R26 and higher
87       // - IBM and Hitachi JVMs
88       // ... might works for others so we just give it a try
89       return new SunReflectionFactoryInstantiator(type);
90    }
91 }
92