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
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/*
* Copyright (C) 2009-2014 The Project Lombok Authors.
*
* 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.core.handlers.HandlerUtil.*;
import static lombok.javac.handlers.JavacHandlerUtil.*;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import lombok.ConfigurationKeys;
import lombok.SneakyThrows;
import lombok.core.AnnotationValues;
import lombok.core.HandlerPriority;
import lombok.javac.JavacAnnotationHandler;
import lombok.javac.JavacNode;
import lombok.javac.JavacTreeMaker;
import org.mangosdk.spi.ProviderFor;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCBlock;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.tree.JCTree.JCTry;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.util.List;
import lombok.javac.Javac;
/**
* Handles the {@code lombok.SneakyThrows} annotation for javac.
*/
@ProviderFor(JavacAnnotationHandler.class)
@HandlerPriority(value = 1024) // 2^10; @NonNull must have run first, so that we wrap around the statements generated by it.
public class HandleSneakyThrows extends JavacAnnotationHandler<SneakyThrows> {
@Override public void handle(AnnotationValues<SneakyThrows> annotation, JCAnnotation ast, JavacNode annotationNode) {
handleFlagUsage(annotationNode, ConfigurationKeys.SNEAKY_THROWS_FLAG_USAGE, "@SneakyThrows");
deleteAnnotationIfNeccessary(annotationNode, SneakyThrows.class);
Collection<String> exceptionNames = annotation.getRawExpressions("value");
if (exceptionNames.isEmpty()) {
exceptionNames = Collections.singleton("java.lang.Throwable");
}
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);
}
JavacNode owner = annotationNode.up();
switch (owner.getKind()) {
case METHOD:
handleMethod(annotationNode, (JCMethodDecl)owner.get(), exceptions);
break;
default:
annotationNode.addError("@SneakyThrows is legal only on methods and constructors.");
break;
}
}
public void handleMethod(JavacNode annotation, JCMethodDecl method, Collection<String> exceptions) {
JavacNode methodNode = annotation.up();
if ( (method.mods.flags & Flags.ABSTRACT) != 0) {
annotation.addError("@SneakyThrows can only be used on concrete methods.");
return;
}
if (method.body == null || method.body.stats.isEmpty()) {
generateEmptyBlockWarning(methodNode, annotation, false);
return;
}
final JCStatement constructorCall = method.body.stats.get(0);
final boolean isConstructorCall = isConstructorCall(constructorCall);
List<JCStatement> contents = isConstructorCall ? method.body.stats.tail : method.body.stats;
if (contents == null || contents.isEmpty()) {
generateEmptyBlockWarning(methodNode, annotation, true);
return;
}
for (String exception : exceptions) {
contents = List.of(buildTryCatchBlock(methodNode, contents, exception, annotation));
}
method.body.stats = isConstructorCall ? List.of(constructorCall).appendList(contents) : contents;
methodNode.rebuild();
}
public void generateEmptyBlockWarning(JavacNode methodNode, JavacNode annotation, boolean hasConstructorCall) {
if (hasConstructorCall) {
annotation.addWarning("Calls to sibling / super constructors are always excluded from @SneakyThrows; @SneakyThrows has been ignored because there is no other code in this constructor.");
} else {
annotation.addWarning("This method or constructor is empty; @SneakyThrows has been ignored.");
}
}
public JCStatement buildTryCatchBlock(JavacNode node, List<JCStatement> contents, String exception, JavacNode source) {
JavacTreeMaker maker = node.getTreeMaker();
JCBlock tryBlock = setGeneratedBy(maker.Block(0, contents), source);
JCExpression varType = chainDots(node, exception.split("\\."));
JCVariableDecl catchParam = maker.VarDef(maker.Modifiers(Flags.FINAL | Flags.PARAMETER), node.toName("$ex"), varType, null);
JCExpression lombokLombokSneakyThrowNameRef = chainDots(node, "lombok", "Lombok", "sneakyThrow");
JCBlock catchBody = maker.Block(0, List.<JCStatement>of(maker.Throw(maker.Apply(
List.<JCExpression>nil(), lombokLombokSneakyThrowNameRef,
List.<JCExpression>of(maker.Ident(node.toName("$ex")))))));
JCTry tryStatement = maker.Try(tryBlock, List.of(recursiveSetGeneratedBy(maker.Catch(catchParam, catchBody), source)), null);
if (JavacHandlerUtil.inNetbeansEditor(node)) {
//set span (start and end position) of the try statement and the main block
//this allows NetBeans to dive into the statement correctly:
JCCompilationUnit top = (JCCompilationUnit) node.top().get();
int startPos = contents.head.pos;
int endPos = Javac.getEndPosition(contents.last().pos(), top);
tryBlock.pos = startPos;
tryStatement.pos = startPos;
Javac.storeEnd(tryBlock, endPos, top);
Javac.storeEnd(tryStatement, endPos, top);
}
return setGeneratedBy(tryStatement, source);
}
}
|
