| /* |
| * Copyright 2000-2013 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.bugs; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.InheritanceUtil; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import org.jetbrains.annotations.Nls; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * @author Bas Leijdekkers |
| */ |
| public class SuspiciousArrayCastInspection extends BaseInspection { |
| |
| @Nls |
| @NotNull |
| @Override |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message("suspicious.array.cast.display.name"); |
| } |
| |
| @NotNull |
| @Override |
| protected String buildErrorString(Object... infos) { |
| return InspectionGadgetsBundle.message("suspicious.array.cast.problem.descriptor"); |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new SuspiciousArrayCastVisitor(); |
| } |
| |
| private static class SuspiciousArrayCastVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitTypeCastExpression(PsiTypeCastExpression expression) { |
| super.visitTypeCastExpression(expression); |
| final PsiTypeElement typeElement = expression.getCastType(); |
| if (typeElement == null) { |
| return; |
| } |
| final PsiType castType = typeElement.getType(); |
| if (!(castType instanceof PsiArrayType)) { |
| return; |
| } |
| final PsiExpression operand = expression.getOperand(); |
| if (operand == null) { |
| return; |
| } |
| final PsiType type = operand.getType(); |
| if (!(type instanceof PsiArrayType)) { |
| return; |
| } |
| final PsiType castComponentType = castType.getDeepComponentType(); |
| if (!(castComponentType instanceof PsiClassType)) { |
| return; |
| } |
| final PsiClassType castClassType = (PsiClassType)castComponentType; |
| final PsiClass castClass = castClassType.resolve(); |
| if (castClass == null) { |
| return; |
| } |
| final PsiType componentType = type.getDeepComponentType(); |
| if (!(componentType instanceof PsiClassType)) { |
| return; |
| } |
| final PsiClassType classType = (PsiClassType)componentType; |
| final PsiClass aClass = classType.resolve(); |
| if (aClass == null || !castClass.isInheritor(aClass, true) || isCollectionToArrayCall(operand)) { |
| return; |
| } |
| registerError(typeElement); |
| } |
| |
| private static boolean isCollectionToArrayCall(PsiExpression expression) { |
| if (!(expression instanceof PsiMethodCallExpression)) { |
| return false; |
| } |
| final PsiMethodCallExpression methodCallExpression = (PsiMethodCallExpression)expression; |
| final PsiExpressionList argumentList = methodCallExpression.getArgumentList(); |
| if (argumentList.getExpressions().length != 1) { |
| return false; |
| } |
| final PsiReferenceExpression methodExpression = methodCallExpression.getMethodExpression(); |
| if (!"toArray".equals(methodExpression.getReferenceName())) { |
| return false; |
| } |
| final PsiMethod method = methodCallExpression.resolveMethod(); |
| if (method == null) { |
| return false; |
| } |
| final PsiClass containingClass = method.getContainingClass(); |
| return !(containingClass == null || !InheritanceUtil.isInheritor(containingClass, CommonClassNames.JAVA_UTIL_COLLECTION)); |
| } |
| } |
| } |