Mercurial > jdk8-mips64-public > langtools / file comparison

comparison: src/share/classes/com/sun/tools/classfile/Descriptor.java

src/share/classes/com/sun/tools/classfile/Descriptor.java

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1 /*
2 * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26
27 package com.sun.tools.classfile;
28
29 import java.io.IOException;
30
31 /**
32 * See JVMS3, section 4.4.
33 *
34 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
35 * you write code that depends on this, you do so at your own risk.
36 * This code and its internal interfaces are subject to change or
37 * deletion without notice.</b>
38 */
39 public class Descriptor {
40 public class InvalidDescriptor extends DescriptorException {
41 InvalidDescriptor(String desc) {
42 this.desc = desc;
43 this.index = -1;
44 }
45
46 InvalidDescriptor(String desc, int index) {
47 this.desc = desc;
48 this.index = index;
49 }
50
51 @Override
52 public String getMessage() {
53 // i18n
54 if (index == -1)
55 return "invalid descriptor \"" + desc + "\"";
56 else
57 return "descriptor is invalid at offset " + index + " in \"" + desc + "\"";
58 }
59
60 public final String desc;
61 public final int index;
62
63 }
64
65 public Descriptor(ClassReader cr) throws IOException {
66 this(cr.readUnsignedShort());
67 }
68
69 public Descriptor(int index) {
70 this.index = index;
71
72 }
73
74 public String getValue(ConstantPool constant_pool) throws ConstantPoolException {
75 return constant_pool.getUTF8Value(index);
76 }
77
78 public int getParameterCount(ConstantPool constant_pool)
79 throws ConstantPoolException, InvalidDescriptor {
80 String desc = getValue(constant_pool);
81 int end = desc.indexOf(")");
82 if (end == -1)
83 throw new InvalidDescriptor(desc);
84 parse(desc, 0, end + 1);
85 return count;
86
87 }
88
89 public String getParameterTypes(ConstantPool constant_pool)
90 throws ConstantPoolException, InvalidDescriptor {
91 String desc = getValue(constant_pool);
92 int end = desc.indexOf(")");
93 if (end == -1)
94 throw new InvalidDescriptor(desc);
95 return parse(desc, 0, end + 1);
96 }
97
98 public String getReturnType(ConstantPool constant_pool)
99 throws ConstantPoolException, InvalidDescriptor {
100 String desc = getValue(constant_pool);
101 int end = desc.indexOf(")");
102 if (end == -1)
103 throw new InvalidDescriptor(desc);
104 return parse(desc, end + 1, desc.length());
105 }
106
107 public String getFieldType(ConstantPool constant_pool)
108 throws ConstantPoolException, InvalidDescriptor {
109 String desc = getValue(constant_pool);
110 return parse(desc, 0, desc.length());
111 }
112
113 private String parse(String desc, int start, int end)
114 throws InvalidDescriptor {
115 int p = start;
116 StringBuffer sb = new StringBuffer();
117 int dims = 0;
118 count = 0;
119
120 while (p < end) {
121 String type;
122 char ch;
123 switch (ch = desc.charAt(p++)) {
124 case '(':
125 sb.append('(');
126 continue;
127
128 case ')':
129 sb.append(')');
130 continue;
131
132 case '[':
133 dims++;
134 continue;
135
136 case 'B':
137 type = "byte";
138 break;
139
140 case 'C':
141 type = "char";
142 break;
143
144 case 'D':
145 type = "double";
146 break;
147
148 case 'F':
149 type = "float";
150 break;
151
152 case 'I':
153 type = "int";
154 break;
155
156 case 'J':
157 type = "long";
158 break;
159
160 case 'L':
161 int sep = desc.indexOf(';', p);
162 if (sep == -1)
163 throw new InvalidDescriptor(desc, p - 1);
164 type = desc.substring(p, sep).replace('/', '.');
165 p = sep + 1;
166 break;
167
168 case 'S':
169 type = "short";
170 break;
171
172 case 'Z':
173 type = "boolean";
174 break;
175
176 case 'V':
177 type = "void";
178 break;
179
180 default:
181 throw new InvalidDescriptor(desc, p - 1);
182 }
183
184 if (sb.length() > 1 && sb.charAt(0) == '(')
185 sb.append(", ");
186 sb.append(type);
187 for ( ; dims > 0; dims-- )
188 sb.append("[]");
189
190 count++;
191 }
192
193 return sb.toString();
194 }
195
196 public final int index;
197 private int count;
198 }

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