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Java > Open Source Codes > com > puppycrawl > tools > checkstyle > bcel > generic > Utils


1 //Tested with BCEL-5.1
2 //http://jakarta.apache.org/builds/jakarta-bcel/release/v5.1/
3
4 package com.puppycrawl.tools.checkstyle.bcel.generic;
5
6 import org.apache.bcel.generic.ReferenceType;
7 import org.apache.bcel.generic.Type;
8
9 /**
10  * Utility methods.
11  * @author Rick Giles
12  * @version 17-Jun-2003
13  */
14 public class Utils
15 {
16     /**
17      * Tests whether one type is compatible with another for method
18      * invocation conversion. This includes assignment conversion,
19      * except the implicit narrowing of integer constants.
20      * JLS Section 5.2
21      * @param aSubType the type to be converted.
22      * @param aSuperType the converted type.
23      * @return true if aSubType can be converted to aSuperType.
24      */
25     public static boolean isCompatible(Type aSubType, Type aSuperType)
26     {
27         boolean result = false;
28
29         if (aSubType.equals(aSuperType)) {
30             // identity conversion
31 result = true;
32         }
33         else if ((aSubType instanceof ReferenceType)
34             && (aSuperType instanceof ReferenceType))
35         {
36             // widening reference conversion?
37 final ReferenceType aSubRefType = (ReferenceType) aSubType;
38             result = aSubRefType.isAssignmentCompatibleWith(aSuperType);
39         }
40         // widening primitive conversion?
41 else if (aSubType.equals(Type.BYTE)) {
42             result =
43                 aSuperType.equals(Type.SHORT)
44                     || aSuperType.equals(Type.INT)
45                     || aSuperType.equals(Type.LONG)
46                     || aSuperType.equals(Type.FLOAT)
47                     || aSuperType.equals(Type.DOUBLE);
48         }
49         else if (aSubType.equals(Type.SHORT)) {
50             result =
51                 aSuperType.equals(Type.INT)
52                     || aSuperType.equals(Type.LONG)
53                     || aSuperType.equals(Type.FLOAT)
54                     || aSuperType.equals(Type.DOUBLE);
55         }
56         else if (aSubType.equals(Type.INT)) {
57             result =
58                 aSuperType.equals(Type.LONG)
59                     || aSuperType.equals(Type.FLOAT)
60                     || aSuperType.equals(Type.DOUBLE);
61         }
62         else if (aSubType.equals(Type.LONG)) {
63             result =
64                 aSuperType.equals(Type.FLOAT) || aSuperType.equals(Type.DOUBLE);
65         }
66         else if (aSubType.equals(Type.DOUBLE)) {
67             result = aSuperType.equals(Type.DOUBLE);
68         }
69         return result;
70     }
71 }
72
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