1 package net.sf.collections15.internal;
2
3 import java.util.HashMap;
4 import java.util.Map;
5
6 /***
7 * <code>ReflectionUtils</code> provides common methods relating to reflection,
8 * for use by other classes in Collections15.
9 * <p/>
10 * <b>This class is not indended to form part of the Collections15 public API.
11 * It's methods are subject to change at any time, and should not be invoked by
12 * code outside of the Commons15 project.
13 */
14 public class ReflectionUtils
15 {
16 /***
17 * Determines whether or not the specified object can be assigned to a
18 * reference of the specified type. </p> This method provides special
19 * handling of the primitive classes, allowing <code>Class</code>/<code>Object</code>
20 * pairs that are specified as arguments to code that involves reflection to
21 * be checked for compatibility.
22 *
23 * @param type The type - must not be <code>null</code>, though this is not
24 * checked.
25 * @param value The object.
26 *
27 * @return <code>true</code> if the <code>value</code> can be assigned to
28 * reference of type <code>type</code>. If the <code>type</code>
29 * represents a primitive java type, it is substituted with the
30 * <code>Class</code> that represents its corresponding
31 * non-primitive type. This method then defers to
32 * <code>type.isInstance(value)</code>.
33 * <p/>
34 * Note, if <code>value</code> is <code>null</code>, this method
35 * will always return <code>true</code>.
36 */
37 public static boolean isAssignableTo(Class type, Object value)
38 {
39 if (value == null) {
40 return true;
41 }
42 if (type.isPrimitive()) {
43 type = typeLookup.get(type);
44 }
45 return type.isInstance(value);
46 }
47
48 private static Map<Class, Class> typeLookup;
49
50 static
51 {
52 typeLookup = new HashMap<Class, Class>(12, 0.75f);
53 typeLookup.put(Void.TYPE, Void.class);
54 typeLookup.put(Boolean.TYPE, Boolean.class);
55 typeLookup.put(Byte.TYPE, Byte.class);
56 typeLookup.put(Short.TYPE, Short.class);
57 typeLookup.put(Character.TYPE, Character.class);
58 typeLookup.put(Integer.TYPE, Integer.class);
59 typeLookup.put(Long.TYPE, Long.class);
60 typeLookup.put(Float.TYPE, Float.class);
61 typeLookup.put(Double.TYPE, Double.class);
62 }
63 }