1 /*
2  * Copyright 2012, Google Inc.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are
7  * met:
8  *
9  *     * Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *     * Redistributions in binary form must reproduce the above
12  * copyright notice, this list of conditions and the following disclaimer
13  * in the documentation and/or other materials provided with the
14  * distribution.
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16  * contributors may be used to endorse or promote products derived from
17  * this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 package org.jf.dexlib2.util;
33 
34 import org.jf.dexlib2.AccessFlags;
35 import org.jf.dexlib2.iface.ClassDef;
36 import org.jf.dexlib2.iface.reference.TypeReference;
37 
38 import javax.annotation.Nonnull;
39 
40 public final class TypeUtils {
isWideType(@onnull String type)41     public static boolean isWideType(@Nonnull String type) {
42         char c = type.charAt(0);
43         return c == 'J' || c == 'D';
44     }
45 
isWideType(@onnull TypeReference type)46     public static boolean isWideType(@Nonnull TypeReference type) {
47         return isWideType(type.getType());
48     }
49 
isPrimitiveType(String type)50     public static boolean isPrimitiveType(String type) {
51         return type.length() == 1;
52     }
53 
54     @Nonnull
getPackage(@onnull String type)55     public static String getPackage(@Nonnull String type) {
56         int lastSlash = type.lastIndexOf('/');
57         if (lastSlash < 0) {
58             return "";
59         }
60         return type.substring(1, lastSlash);
61     }
62 
canAccessClass(@onnull String accessorType, @Nonnull ClassDef accesseeClassDef)63     public static boolean canAccessClass(@Nonnull String accessorType, @Nonnull ClassDef accesseeClassDef) {
64         if (AccessFlags.PUBLIC.isSet(accesseeClassDef.getAccessFlags())) {
65             return true;
66         }
67 
68         // Classes can only be public or package private. Any private or protected inner classes are actually
69         // package private.
70         return getPackage(accesseeClassDef.getType()).equals(getPackage(accessorType));
71     }
72 
TypeUtils()73     private TypeUtils() {}
74 }
75