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1
11 package org.eclipse.jdt.internal.corext.refactoring.typeconstraints;
12
13 import java.util.Arrays  ;
14 import java.util.Collection ;
15 import java.util.HashSet ;
16
17 import org.eclipse.core.runtime.Assert;
18
19
20 public final class ConstraintOperator {
21
22 private final String fOperatorString;
23 private final int fOperatorCode;
24
25 private static final int CODE_SUBTYPE= 0;
26 private static final int CODE_EQUALS= 1;
27 private static final int CODE_DEFINES= 2;
28 private static final int CODE_STRICT_SUBTYPE= 3;
29
30 private static final String STRING_SUBTYPE= "<="; private static final String STRING_EQUALS= "=="; private static final String STRING_DEFINES= "=^="; private static final String STRING_STRICT_SUBTYPE= "<"; private static final Collection fgOperatorStrings= new HashSet (Arrays.asList(new String [] {STRING_SUBTYPE, STRING_EQUALS, STRING_DEFINES, STRING_STRICT_SUBTYPE}));
35
36 private static final ConstraintOperator fgSubtype= new ConstraintOperator(STRING_SUBTYPE, CODE_SUBTYPE);
37 private static final ConstraintOperator fgEquals= new ConstraintOperator(STRING_EQUALS, CODE_EQUALS);
38 private static final ConstraintOperator fgDefines= new ConstraintOperator(STRING_DEFINES, CODE_DEFINES);
39 private static final ConstraintOperator fgStrictSubtype= new ConstraintOperator(STRING_STRICT_SUBTYPE, CODE_STRICT_SUBTYPE);
40
41 public static ConstraintOperator createSubTypeOperator() {
42 return fgSubtype;
43 }
44
45 public static ConstraintOperator createEqualsOperator() {
46 return fgEquals;
47 }
48
49 public static ConstraintOperator createDefinesOperator() {
50 return fgDefines;
51 }
52
53 public static ConstraintOperator createStrictSubtypeOperator() {
54 return fgStrictSubtype;
55 }
56
57 private ConstraintOperator(String string, int code){
58 Assert.isTrue(fgOperatorStrings.contains(string));
59 Assert.isTrue(code == CODE_DEFINES || code == CODE_EQUALS || code == CODE_STRICT_SUBTYPE || code == CODE_SUBTYPE);
60 fOperatorString= string;
61 fOperatorCode= code;
62 }
63
64 public String getOperatorString(){
65 return fOperatorString;
66 }
67
68
71 public String toString() {
72 return getOperatorString();
73 }
74
75
78 public boolean equals(Object obj) {
79 if (! (obj instanceof ConstraintOperator))
80 return false;
81 ConstraintOperator other= (ConstraintOperator)obj;
82 return fOperatorCode == other.fOperatorCode;
83 }
84
85
88 public int hashCode() {
89 return fOperatorString.hashCode();
90 }
91
92 public final boolean isSubtypeOperator() {
93 return fOperatorCode == CODE_SUBTYPE;
94 }
95
96 public final boolean isStrictSubtypeOperator() {
97 return fOperatorCode == CODE_STRICT_SUBTYPE;
98 }
99
100 public final boolean isEqualsOperator() {
101 return fOperatorCode == CODE_EQUALS;
102 }
103
104 public final boolean isDefinesOperator() {
105 return fOperatorCode == CODE_DEFINES;
106 }
107 }
108 |
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