1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/*
* Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.javac.handlers;
import static lombok.javac.handlers.PKG.chainDots;
import java.util.ArrayList;
import java.util.Collection;
import lombok.SneakyThrows;
import lombok.core.AnnotationValues;
import lombok.javac.JavacAnnotationHandler;
import lombok.javac.JavacAST.Node;
import org.mangosdk.spi.ProviderFor;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCAssign;
import com.sun.tools.javac.tree.JCTree.JCBlock;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCNewArray;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.util.List;
/**
* Handles the <code>lombok.SneakyThrows</code> annotation for javac.
*/
@ProviderFor(JavacAnnotationHandler.class)
public class HandleSneakyThrows implements JavacAnnotationHandler<SneakyThrows> {
@Override public boolean handle(AnnotationValues<SneakyThrows> annotation, JCAnnotation ast, Node annotationNode) {
Collection<String> exceptionNames = annotation.getRawExpressions("value");
List<JCExpression> memberValuePairs = ast.getArguments();
if ( memberValuePairs == null || memberValuePairs.size() == 0 ) return false;
JCExpression arrayOrSingle = ((JCAssign)memberValuePairs.get(0)).rhs;
final List<JCExpression> exceptionNameNodes;
if ( arrayOrSingle instanceof JCNewArray ) {
exceptionNameNodes = ((JCNewArray)arrayOrSingle).elems;
} else exceptionNameNodes = List.of(arrayOrSingle);
if ( exceptionNames.size() != exceptionNameNodes.size() ) {
annotationNode.addError(
"LOMBOK BUG: The number of exception classes in the annotation isn't the same pre- and post- guessing.");
}
java.util.List<String> exceptions = new ArrayList<String>();
for ( String exception : exceptionNames ) {
if ( exception.endsWith(".class") ) exception = exception.substring(0, exception.length() - 6);
exceptions.add(exception);
}
Node owner = annotationNode.up();
switch ( owner.getKind() ) {
case METHOD:
return handleMethod(annotationNode, (JCMethodDecl)owner.get(), exceptions);
default:
annotationNode.addError("@SneakyThrows is legal only on methods and constructors.");
return true;
}
}
private boolean handleMethod(Node annotation, JCMethodDecl method, Collection<String> exceptions) {
Node methodNode = annotation.up();
if ( (method.mods.flags & Flags.ABSTRACT) != 0 ) {
annotation.addError("@SneakyThrows can only be used on concrete methods.");
return true;
}
if ( method.body == null ) return false;
List<JCStatement> contents = method.body.stats;
for ( String exception : exceptions ) {
contents = List.of(buildTryCatchBlock(methodNode, contents, exception));
}
method.body.stats = contents;
methodNode.rebuild();
return true;
}
private JCStatement buildTryCatchBlock(Node node, List<JCStatement> contents, String exception) {
TreeMaker maker = node.getTreeMaker();
JCBlock tryBlock = maker.Block(0, contents);
JCExpression varType = chainDots(maker, node, exception.split("\\."));
JCVariableDecl catchParam = maker.VarDef(maker.Modifiers(0), node.toName("$ex"), varType, null);
JCExpression lombokLombokSneakyThrowNameRef = chainDots(maker, node, "lombok", "Lombok", "sneakyThrow");
JCBlock catchBody = maker.Block(0, List.<JCStatement>of(maker.Throw(maker.Apply(
List.<JCExpression>nil(), lombokLombokSneakyThrowNameRef,
List.<JCExpression>of(maker.Ident(node.toName("$ex")))))));
return maker.Try(tryBlock, List.of(maker.Catch(catchParam, catchBody)), null);
}
}
|
