| /* |
| * 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<HierarchicalMethodSignature> 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); |
| } |
| } |
| } |