1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 public class Main {
18   public final static int INTERFACE_DEFINED_BITS =
19       0x0001 |  // public, may be set.
20       0x0002 |  // private, may be flagged by inner class.
21       0x0004 |  // protected, may be flagged by inner class.
22       0x0008 |  // static, may be flagged by inner class.
23       0x0010 |  // final, must not be set.
24       0x0020 |  // super, must not be set.
25       0x0200 |  // interface, must be set.
26       0x0400 |  // abstract, must be set.
27       0x1000 |  // synthetic, may be set.
28       0x2000 |  // annotation, may be set (annotation implies interface)
29       0x4000 ;  // enum, must not be set.
30 
31   public final static int CLASS_DEFINED_BITS =
32       0x0001 |  // public, may be set.
33       0x0002 |  // private, may be flagged by inner class.
34       0x0004 |  // protected, may be flagged by inner class.
35       0x0008 |  // static, may be flagged by inner class.
36       0x0010 |  // final, may be set.
37       0x0020 |  // super, may be set.
38       0x0200 |  // interface, must not be set.
39       0x0400 |  // abstract, may be set.
40       0x1000 |  // synthetic, may be set.
41       0x2000 |  // annotation, must not be set.
42       0x4000 ;  // enum, may be set.
43 
44   public final static int FIELD_DEFINED_BITS =
45        0x0001 |  // public
46        0x0002 |  // private
47        0x0004 |  // protected
48        0x0008 |  // static
49        0x0010 |  // final
50        0x0040 |  // volatile
51        0x0080 |  // transient
52        0x1000 |  // synthetic
53        0x4000 ;  // enum
54 
55   public final static int METHOD_DEFINED_BITS =
56        0x0001 |  // public
57        0x0002 |  // private
58        0x0004 |  // protected
59        0x0008 |  // static
60        0x0010 |  // final
61        0x0020 |  // synchronized
62        0x0040 |  // bridge
63        0x0080 |  // varargs
64        0x0100 |  // native
65        0x0400 |  // abstract
66        0x0800 |  // strictfp
67        0x1000 ;  // synthetic
68 
main(String args[])69   public static void main(String args[]) throws Exception {
70     check("Inf");
71     check("NonInf");
72     check("A");
73     check("A$B");
74   }
75 
check(String className)76   private static void check(String className) throws Exception {
77     Class<?> clazz = Class.forName(className);
78     if (className.equals("Inf")) {
79       if (!clazz.isInterface()) {
80         throw new RuntimeException("Expected an interface.");
81       }
82       int undefinedBits = 0xFFFF ^ INTERFACE_DEFINED_BITS;
83       if ((clazz.getModifiers() & undefinedBits) != 0) {
84         System.out.println("Clazz.getModifiers(): " + Integer.toBinaryString(clazz.getModifiers()));
85         System.out.println("INTERFACE_DEF_BITS: " + Integer.toBinaryString(INTERFACE_DEFINED_BITS));
86         throw new RuntimeException("Undefined bits for an interface: " + className);
87       }
88     } else {
89       if (clazz.isInterface()) {
90         throw new RuntimeException("Expected a class.");
91       }
92       int undefinedBits = 0xFFFF ^ CLASS_DEFINED_BITS;
93       if ((clazz.getModifiers() & undefinedBits) != 0) {
94         System.out.println("Clazz.getModifiers(): " + Integer.toBinaryString(clazz.getModifiers()));
95         System.out.println("CLASS_DEF_BITS: " + Integer.toBinaryString(CLASS_DEFINED_BITS));
96         throw new RuntimeException("Undefined bits for a class: " + className);
97       }
98     }
99 
100     // Check fields.
101     for (java.lang.reflect.Field f : clazz.getDeclaredFields()) {
102       String name = f.getName();
103       int undefinedBits = 0xFFFF ^ FIELD_DEFINED_BITS;
104       if ((f.getModifiers() & undefinedBits) != 0) {
105         System.out.println("f.getModifiers(): " + Integer.toBinaryString(f.getModifiers()));
106         System.out.println("FIELD_DEF_BITS: " + Integer.toBinaryString(FIELD_DEFINED_BITS));
107         throw new RuntimeException("Unexpected field bits: " + name);
108       }
109       if (name.equals("I")) {
110         // Interface field, just check generically.
111       } else {
112         // Check the name, see that the corresponding bit is set.
113         int bitmask = getFieldMask(name);
114         if ((bitmask & f.getModifiers()) == 0) {
115           throw new RuntimeException("Expected field bit not set.");
116         }
117       }
118     }
119 
120     // Check methods.
121     for (java.lang.reflect.Method m : clazz.getDeclaredMethods()) {
122       String name = m.getName();
123       int undefinedBits = 0xFFFF ^ METHOD_DEFINED_BITS;
124       if ((m.getModifiers() & undefinedBits) != 0) {
125           System.out.println("m.getModifiers(): " + Integer.toBinaryString(m.getModifiers()));
126           System.out.println("METHOD_DEF_BITS: " + Integer.toBinaryString(METHOD_DEFINED_BITS));
127         throw new RuntimeException("Unexpected method bits: " + name);
128       }
129       // Check the name, see that the corresponding bit is set.
130       int bitmask = getMethodMask(name);
131       if ((bitmask & m.getModifiers()) == 0) {
132         throw new RuntimeException("Expected method bit not set.");
133       }
134     }
135   }
136 
getFieldMask(String name)137   private static int getFieldMask(String name) {
138     int index = name.indexOf("Field");
139     if (index > 0) {
140       String shortS = name.substring(0, index);
141       if (shortS.equals("public")) {
142         return 0x0001;
143       }
144       if (shortS.equals("private")) {
145         return 0x0002;
146       }
147       if (shortS.equals("protected")) {
148         return 0x0004;
149       }
150       if (shortS.equals("static")) {
151         return 0x0008;
152       }
153       if (shortS.equals("transient")) {
154         return 0x0080;
155       }
156       if (shortS.equals("volatile")) {
157         return 0x0040;
158       }
159       if (shortS.equals("final")) {
160         return 0x0010;
161       }
162     }
163     throw new RuntimeException("Unexpected field name " + name);
164   }
165 
getMethodMask(String name)166   private static int getMethodMask(String name) {
167     int index = name.indexOf("Method");
168     if (index > 0) {
169       String shortS = name.substring(0, index);
170       if (shortS.equals("public")) {
171         return 0x0001;
172       }
173       if (shortS.equals("private")) {
174         return 0x0002;
175       }
176       if (shortS.equals("protected")) {
177         return 0x0004;
178       }
179       if (shortS.equals("static")) {
180         return 0x0008;
181       }
182       if (shortS.equals("synchronized")) {
183         return 0x0020;
184       }
185       if (shortS.equals("varargs")) {
186         return 0x0080;
187       }
188       if (shortS.equals("final")) {
189         return 0x0010;
190       }
191       if (shortS.equals("native")) {
192         return 0x0100;
193       }
194       if (shortS.equals("abstract")) {
195         return 0x0400;
196       }
197       if (shortS.equals("strictfp")) {
198         return 0x0800;
199       }
200     }
201     throw new RuntimeException("Unexpected method name " + name);
202   }
203 }
204