|
1
6
7 package org.jfox.ioc.util;
8
9 import java.lang.reflect.Method  ;
10 import java.lang.reflect.Modifier ;
11 import java.security.MessageDigest ;
12 import java.security.NoSuchAlgorithmException ;
13
14
17
18 public class Methods {
19
20 public final static Method ToString;
21 public final static Method HashCode;
22 public final static Method Equals;
23
24 static {
25 try {
26 Class ejbObjectClass = Object .class;
27 ToString = ejbObjectClass.getMethod("toString", Classes.EMPTY_CLASS_ARRAY);
28 HashCode = ejbObjectClass.getMethod("hashCode", Classes.EMPTY_CLASS_ARRAY);
29 Equals = ejbObjectClass.getMethod("equals", new Class []{Object .class});
30 }
31 catch(Exception e) {
32 e.printStackTrace();
33 throw new RuntimeException (e.getMessage());
34 }
35 };
36
37
38 private static MessageDigest md5 = null;
39
40 static {
41 try {
42 md5 = MessageDigest.getInstance("MD5");
43 }
44 catch(NoSuchAlgorithmException e) {
45 throw new RuntimeException (e.getMessage());
46 }
47 }
48
49
55 public static long getMethodHash(Method method) {
56 long hash = 0;
57 Class [] parameterTypes = method.getParameterTypes();
58 String methodDesc = method.getName() + "(";
59 for(int j = 0; j < parameterTypes.length; j++) {
60 methodDesc += getTypeString(parameterTypes[j]);
61 }
62 methodDesc += ")" + getTypeString(method.getReturnType());
63
64 try {
65 byte[] bytes = md5.digest(methodDesc.getBytes("ISO-8859-1"));
66 for(int j = 0; j < Math.min(8, bytes.length); j++) {
67 hash += (long) (bytes[j] & 0xff) << j * 8;
68 }
69 }
70 catch(Exception e) {
71 e.printStackTrace();
72 }
73 return hash;
74 }
75
76 private static String getTypeString(Class cl) {
77 if(cl == Byte.TYPE) {
78 return "B";
79 }
80 else if(cl == Character.TYPE) {
81 return "C";
82 }
83 else if(cl == Double.TYPE) {
84 return "D";
85 }
86 else if(cl == Float.TYPE) {
87 return "F";
88 }
89 else if(cl == Integer.TYPE) {
90 return "I";
91 }
92 else if(cl == Long.TYPE) {
93 return "J";
94 }
95 else if(cl == Short.TYPE) {
96 return "S";
97 }
98 else if(cl == Boolean.TYPE) {
99 return "Z";
100 }
101 else if(cl == Void.TYPE) {
102 return "V";
103 }
104 else if(cl.isArray()) {
105 return "[" + getTypeString(cl.getComponentType());
106 }
107 else {
108 return "L" + cl.getName().replace('.', '/') + ";";
109 }
110 }
111
112
120 public static boolean isDeclaredBy(Method method, Class clz) {
121 Class declaredClass = method.getDeclaringClass();
122 if(declaredClass == clz) {
123 return true;
124 }
125 else {
126 if(clz.isAssignableFrom(declaredClass)) {
128 try {
129 clz.getMethod(method.getName(), method.getParameterTypes());
130 return true;
131 }
132 catch(NoSuchMethodException e) {
133 }
134 }
135 }
136 return false;
137 }
138
139 public static boolean isGetMethod(Method method) {
140 if(((method.getName().startsWith("get")
141 && !method.getName().equals("get"))
142 || (method.getName().startsWith("is")
143 && !method.getName().equals("is")))
144 && method.getReturnType() != void.class
145 && method.getParameterTypes().length == 0) {
146 return true;
147 }
148 return false;
149 }
150
151 public static boolean isSetMethod(Method method) {
152 if(method.getName().startsWith("set")
153 && !method.getName().equals("set")
154 && method.getReturnType() == void.class
155 && method.getParameterTypes().length == 1) {
156 return true;
157 }
158 return false;
159 }
160
161 public static boolean isStatic(Method method) {
162 return Modifier.isStatic(method.getModifiers());
163 }
164
165 public static boolean isPrivate(Method method) {
166 return Modifier.isPrivate(method.getModifiers());
167 }
168
169 public static boolean isAbstract(Method method) {
170 return Modifier.isAbstract(method.getModifiers());
171 }
172
173 public static void main(String [] args) {
174
175 }
176 }
177
178 |
Popular Tags |
Java API By Example, From Geeks To Geeks.