blob: e4f77e0fbea91cdbe4aa39a1a111ea3533eceacd (
plain)
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
|
/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.siyeh.ig.classlayout;
import com.intellij.codeInsight.AnnotationUtil;
import com.intellij.codeInsight.intention.AddAnnotationPsiFix;
import com.intellij.psi.*;
import com.intellij.psi.util.MethodSignature;
import com.intellij.psi.util.PsiUtil;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import com.siyeh.ig.DelegatingFix;
import com.siyeh.ig.InspectionGadgetsFix;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.List;
/**
* @author Bas Leijdekkers
*/
public class InterfaceMayBeAnnotatedFunctionalInspection extends BaseInspection {
@Nls
@NotNull
@Override
public String getDisplayName() {
return InspectionGadgetsBundle.message("interface.may.be.annotated.functional.display.name");
}
@NotNull
@Override
protected String buildErrorString(Object... infos) {
return InspectionGadgetsBundle.message("interface.may.be.annotated.functional.problem.descriptor");
}
@Nullable
@Override
protected InspectionGadgetsFix buildFix(Object... infos) {
final PsiClass aClass = (PsiClass)infos[0];
return new DelegatingFix(new AddAnnotationPsiFix(CommonClassNames.JAVA_LANG_FUNCTIONAL_INTERFACE, aClass, PsiNameValuePair.EMPTY_ARRAY));
}
@Override
public BaseInspectionVisitor buildVisitor() {
return new InterfaceMayBeAnnotatedFunctionalVisitor();
}
private static class InterfaceMayBeAnnotatedFunctionalVisitor extends BaseInspectionVisitor {
@Override
public void visitClass(PsiClass aClass) {
if (!PsiUtil.isLanguageLevel8OrHigher(aClass)) {
return;
}
super.visitClass(aClass);
if (!aClass.isInterface() || AnnotationUtil.isAnnotated(aClass, "java.lang.FunctionalInterface", false)) {
return;
}
if (LambdaHighlightingUtil.checkInterfaceFunctional(aClass) != null) {
return;
}
final List<MethodSignature> candidates = LambdaUtil.findFunctionCandidates(aClass);
if (candidates == null || candidates.size() != 1) {
return;
}
final MethodSignature signature = candidates.get(0);
if (signature.getTypeParameters().length > 0) {
return;
}
registerClassError(aClass, aClass);
}
}
}
|
