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1 package com.thoughtworks.xstream.core;
2
3 import com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider;
4 import com.thoughtworks.xstream.converters.reflection.ReflectionProvider;
5
6 import java.util.HashMap  ;
7 import java.util.Map ;
8
9 public class JVM {
10
11 private static Map classCache = new HashMap ();
12 private static ReflectionProvider reflectionProvider;
13
14 public static boolean is14() {
15 return loadClass("java.util.LinkedHashMap") != null;
16 }
17
18 public static Class loadClass(String name) {
19 if (classCache.containsKey(name)) {
20 return (Class ) classCache.get(name);
21 } else {
22 try {
23 Class cls = Class.forName(name);
24 classCache.put(name, cls);
25 return cls;
26 } catch (ClassNotFoundException e) {
27 return null;
28 }
29 }
30 }
31
32 public static synchronized ReflectionProvider bestReflectionProvider() {
33 if (reflectionProvider == null) {
34 try {
35 if (loadClass("sun.misc.Unsafe") != null) {
36 String cls = "com.thoughtworks.xstream.converters.reflection.Sun14ReflectionProvider";
37 reflectionProvider = (ReflectionProvider) loadClass(cls).newInstance();
38 } else {
39 reflectionProvider = new PureJavaReflectionProvider();
40 }
41 } catch (InstantiationException e) {
42 reflectionProvider = new PureJavaReflectionProvider();
43 } catch (IllegalAccessException e) {
44 reflectionProvider = new PureJavaReflectionProvider();
45 }
46 }
47 return reflectionProvider;
48 }
49
50 }
51 |
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