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1
34
35 package org.logicalcobwebs.asm.util;
36
37 import org.logicalcobwebs.asm.ClassAdapter;
38 import org.logicalcobwebs.asm.ClassVisitor;
39 import org.logicalcobwebs.asm.CodeVisitor;
40 import org.logicalcobwebs.asm.Constants;
41 import org.logicalcobwebs.asm.Attribute;
42
43
51
52 public class CheckClassAdapter extends ClassAdapter {
53
54
57
58 private boolean start;
59
60
63
64 private boolean end;
65
66
71
72 public CheckClassAdapter (final ClassVisitor cv) {
73 super(cv);
74 }
75
76 public void visit (
77 final int access,
78 final String  name,
79 final String superName,
80 final String [] interfaces,
81 final String sourceFile)
82 {
83 if (start) {
84 throw new IllegalStateException ("visit must be called only once");
85 } else {
86 start = true;
87 }
88 checkState();
89 checkAccess(access, 1 + 2 + 4 + 16 + 512 + 1024 + 32 + 65536 + 131072);
90 CheckCodeAdapter.checkInternalName(name, "class name");
91 if (name.equals("java/lang/Object")) {
92 if (superName != null) {
93 throw new IllegalArgumentException (
94 "The super class name of the Object class must be 'null'");
95 }
96 } else {
97 CheckCodeAdapter.checkInternalName(superName, "super class name");
98 }
99 if ((access & Constants.ACC_INTERFACE) != 0) {
100 if (!superName.equals("java/lang/Object")) {
101 throw new IllegalArgumentException (
102 "The super class name of interfaces must be 'java/lang/Object'");
103 }
104 }
105 if (interfaces != null) {
106 for (int i = 0; i < interfaces.length; ++i) {
107 CheckCodeAdapter.checkInternalName(
108 interfaces[i], "interface name at index " + i);
109 }
110 }
111 cv.visit(access, name, superName, interfaces, sourceFile);
112 }
113
114 public void visitInnerClass (
115 final String name,
116 final String outerName,
117 final String innerName,
118 final int access)
119 {
120 checkState();
121 CheckCodeAdapter.checkInternalName(name, "class name");
122 if (outerName != null) {
123 CheckCodeAdapter.checkInternalName(outerName, "outer class name");
124 }
125 if (innerName != null) {
126 CheckCodeAdapter.checkIdentifier(innerName, "inner class name");
127 }
128 checkAccess(access, 1 + 2 + 4 + 8 + 16 + 512 + 1024 + 32);
129 cv.visitInnerClass(name, outerName, innerName, access);
130 }
131
132 public void visitField (
133 final int access,
134 final String name,
135 final String desc,
136 final Object value,
137 final Attribute attrs)
138 {
139 checkState();
140 checkAccess(access, 1 + 2 + 4 + 8 + 16 + 64 + 128 + 65536 + 131072);
141 CheckCodeAdapter.checkIdentifier(name, "field name");
142 CheckCodeAdapter.checkDesc(desc, false);
143 if (value != null) {
144 CheckCodeAdapter.checkConstant(value);
145 }
146 cv.visitField(access, name, desc, value, attrs);
147 }
148
149 public CodeVisitor visitMethod (
150 final int access,
151 final String name,
152 final String desc,
153 final String [] exceptions,
154 final Attribute attrs)
155 {
156 checkState();
157 checkAccess(
158 access, 1 + 2 + 4 + 8 + 16 + 32 + 256 + 1024 + 2048 + 65536 + 131072);
159 CheckCodeAdapter.checkMethodIdentifier(name, "method name");
160 CheckCodeAdapter.checkMethodDesc(desc);
161 if (exceptions != null) {
162 for (int i = 0; i < exceptions.length; ++i) {
163 CheckCodeAdapter.checkInternalName(
164 exceptions[i], "exception name at index " + i);
165 }
166 }
167 return new CheckCodeAdapter(
168 cv.visitMethod(access, name, desc, exceptions, attrs));
169 }
170
171 public void visitAttribute (final Attribute attr) {
172 checkState();
173 if (attr == null) {
174 throw new IllegalArgumentException (
175 "Invalid attribute (must not be null)");
176 }
177 }
178
179 public void visitEnd () {
180 checkState();
181 end = true;
182 cv.visitEnd();
183 }
184
185
187
191
192 private void checkState () {
193 if (!start) {
194 throw new IllegalStateException (
195 "Cannot visit member before visit has been called.");
196 }
197 if (end) {
198 throw new IllegalStateException (
199 "Cannot visit member after visitEnd has been called.");
200 }
201 }
202
203
211
212 static void checkAccess (final int access, final int possibleAccess) {
213 if ((access & ~possibleAccess) != 0) {
214 throw new IllegalArgumentException ("Invalid access flags: " + access);
215 }
216 int pub = ((access & Constants.ACC_PUBLIC) != 0 ? 1 : 0);
217 int pri = ((access & Constants.ACC_PRIVATE) != 0 ? 1 : 0);
218 int pro = ((access & Constants.ACC_PROTECTED) != 0 ? 1 : 0);
219 if (pub + pri + pro > 1) {
220 throw new IllegalArgumentException (
221 "public private and protected are mutually exclusive: " + access);
222 }
223 int fin = ((access & Constants.ACC_FINAL) != 0 ? 1 : 0);
224 int abs = ((access & Constants.ACC_ABSTRACT) != 0 ? 1 : 0);
225 if (fin + abs > 1) {
226 throw new IllegalArgumentException (
227 "final and abstract are mutually exclusive: " + access);
228 }
229 }
230 }
231 |
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