1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2005 Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.util.proxy;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javassist.CannotCompileException;
import javassist.bytecode.ClassFile;
/**
* A helper class for implementing <code>ProxyFactory</code>.
* The users of <code>ProxyFactory</code> do not have to see this class.
*
* @see ProxyFactory
*/
public class FactoryHelper {
/**
* Returns an index for accessing arrays in this class.
*
* @throws RuntimeException if a given type is not a primitive type.
*/
public static final int typeIndex(Class type) {
Class[] list = primitiveTypes;
int n = list.length;
for (int i = 0; i < n; i++)
if (list[i] == type)
return i;
throw new RuntimeException("bad type:" + type.getName());
}
/**
* <code>Class</code> objects representing primitive types.
*/
public static final Class[] primitiveTypes = {
Boolean.TYPE, Byte.TYPE, Character.TYPE, Short.TYPE, Integer.TYPE,
Long.TYPE, Float.TYPE, Double.TYPE, Void.TYPE
};
/**
* The fully-qualified names of wrapper classes for primitive types.
*/
public static final String[] wrapperTypes = {
"java.lang.Boolean", "java.lang.Byte", "java.lang.Character",
"java.lang.Short", "java.lang.Integer", "java.lang.Long",
"java.lang.Float", "java.lang.Double", "java.lang.Void"
};
/**
* The descriptors of the constructors of wrapper classes.
*/
public static final String[] wrapperDesc = {
"(Z)V", "(B)V", "(C)V", "(S)V", "(I)V", "(J)V",
"(F)V", "(D)V"
};
/**
* The names of methods for obtaining a primitive value
* from a wrapper object. For example, <code>intValue()</code>
* is such a method for obtaining an integer value from a
* <code>java.lang.Integer</code> object.
*/
public static final String[] unwarpMethods = {
"booleanValue", "byteValue", "charValue", "shortValue",
"intValue", "longValue", "floatValue", "doubleValue"
};
/**
* The descriptors of the unwrapping methods contained
* in <code>unwrapMethods</code>.
*/
public static final String[] unwrapDesc = {
"()Z", "()B", "()C", "()S", "()I", "()J", "()F", "()D"
};
/**
* The data size of primitive types. <code>long</code>
* and <code>double</code> are 2; the others are 1.
*/
public static final int[] dataSize = {
1, 1, 1, 1, 1, 2, 1, 2
};
/**
* Loads a class file by a given class loader.
*/
public static Class toClass(ClassFile cf, ClassLoader loader)
throws CannotCompileException
{
try {
byte[] b = toBytecode(cf);
Class cl = Class.forName("java.lang.ClassLoader");
java.lang.reflect.Method method = cl.getDeclaredMethod(
"defineClass", new Class[] { String.class, byte[].class,
Integer.TYPE, Integer.TYPE });
method.setAccessible(true);
Object[] args = new Object[] { cf.getName(), b, new Integer(0),
new Integer(b.length) };
Class clazz = (Class)method.invoke(loader, args);
method.setAccessible(false);
return clazz;
}
catch (RuntimeException e) {
throw e;
}
catch (java.lang.reflect.InvocationTargetException e) {
throw new CannotCompileException(e.getTargetException());
}
catch (Exception e) {
throw new CannotCompileException(e);
}
}
private static byte[] toBytecode(ClassFile cf) throws IOException {
ByteArrayOutputStream barray = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(barray);
try {
cf.write(out);
}
finally {
out.close();
}
return barray.toByteArray();
}
/**
* Writes a class file.
*/
public static void writeFile(ClassFile cf, String directoryName)
throws CannotCompileException {
try {
writeFile0(cf, directoryName);
}
catch (IOException e) {
throw new CannotCompileException(e);
}
}
private static void writeFile0(ClassFile cf, String directoryName)
throws CannotCompileException, IOException {
String classname = cf.getName();
String filename = directoryName + File.separatorChar
+ classname.replace('.', File.separatorChar) + ".class";
int pos = filename.lastIndexOf(File.separatorChar);
if (pos > 0) {
String dir = filename.substring(0, pos);
if (!dir.equals("."))
new File(dir).mkdirs();
}
DataOutputStream out = new DataOutputStream(new BufferedOutputStream(
new FileOutputStream(filename)));
try {
cf.write(out);
}
catch (IOException e) {
throw e;
}
finally {
out.close();
}
}
}
|
