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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/*
* Copyright (c) 2007, 2009, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.classfile;
import java.io.IOException;
/**
* See JVMS, section 4.4.
*
* <p><b>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public class Descriptor {
public class InvalidDescriptor extends DescriptorException {
private static final long serialVersionUID = 1L;
InvalidDescriptor(String desc) {
this.desc = desc;
this.index = -1;
}
InvalidDescriptor(String desc, int index) {
this.desc = desc;
this.index = index;
}
@Override
public String getMessage() {
// i18n
if (index == -1)
return "invalid descriptor \"" + desc + "\"";
else
return "descriptor is invalid at offset " + index + " in \"" + desc + "\"";
}
public final String desc;
public final int index;
}
public Descriptor(ClassReader cr) throws IOException {
this(cr.readUnsignedShort());
}
public Descriptor(int index) {
this.index = index;
}
public String getValue(ConstantPool constant_pool) throws ConstantPoolException {
return constant_pool.getUTF8Value(index);
}
public int getParameterCount(ConstantPool constant_pool)
throws ConstantPoolException, InvalidDescriptor {
String desc = getValue(constant_pool);
int end = desc.indexOf(")");
if (end == -1)
throw new InvalidDescriptor(desc);
parse(desc, 0, end + 1);
return count;
}
public String getParameterTypes(ConstantPool constant_pool)
throws ConstantPoolException, InvalidDescriptor {
String desc = getValue(constant_pool);
int end = desc.indexOf(")");
if (end == -1)
throw new InvalidDescriptor(desc);
return parse(desc, 0, end + 1);
}
public String getReturnType(ConstantPool constant_pool)
throws ConstantPoolException, InvalidDescriptor {
String desc = getValue(constant_pool);
int end = desc.indexOf(")");
if (end == -1)
throw new InvalidDescriptor(desc);
return parse(desc, end + 1, desc.length());
}
public String getFieldType(ConstantPool constant_pool)
throws ConstantPoolException, InvalidDescriptor {
String desc = getValue(constant_pool);
return parse(desc, 0, desc.length());
}
private String parse(String desc, int start, int end)
throws InvalidDescriptor {
int p = start;
StringBuffer sb = new StringBuffer();
int dims = 0;
count = 0;
while (p < end) {
String type;
char ch;
switch (ch = desc.charAt(p++)) {
case '(':
sb.append('(');
continue;
case ')':
sb.append(')');
continue;
case '[':
dims++;
continue;
case 'B':
type = "byte";
break;
case 'C':
type = "char";
break;
case 'D':
type = "double";
break;
case 'F':
type = "float";
break;
case 'I':
type = "int";
break;
case 'J':
type = "long";
break;
case 'L':
int sep = desc.indexOf(';', p);
if (sep == -1)
throw new InvalidDescriptor(desc, p - 1);
type = desc.substring(p, sep).replace('/', '.');
p = sep + 1;
break;
case 'S':
type = "short";
break;
case 'Z':
type = "boolean";
break;
case 'V':
type = "void";
break;
default:
throw new InvalidDescriptor(desc, p - 1);
}
if (sb.length() > 1 && sb.charAt(0) == '(')
sb.append(", ");
sb.append(type);
for ( ; dims > 0; dims-- )
sb.append("[]");
count++;
}
return sb.toString();
}
public final int index;
private int count;
}
|
