| /* |
| * 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.bugs; |
| |
| import com.intellij.psi.PsiExpression; |
| import com.intellij.psi.PsiExpressionList; |
| import com.intellij.psi.PsiMethodCallExpression; |
| import com.intellij.psi.PsiReferenceExpression; |
| import com.siyeh.InspectionGadgetsBundle;import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.psiutils.EquivalenceChecker; |
| import com.siyeh.ig.psiutils.MethodCallUtils; |
| import com.siyeh.ig.psiutils.SideEffectChecker; |
| import org.jetbrains.annotations.Nls; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * @author Bas Leijdekkers |
| */ |
| public class EqualsWithItselfInspection extends BaseInspection { |
| @Nls |
| @NotNull |
| @Override |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message("equals.with.itself.display.name"); |
| } |
| |
| @NotNull |
| @Override |
| protected String buildErrorString(Object... infos) { |
| return InspectionGadgetsBundle.message("equals.with.itself.problem.descriptor"); |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new EqualsWithIfSelfVisitor(); |
| } |
| |
| private static class EqualsWithIfSelfVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitMethodCallExpression(PsiMethodCallExpression expression) { |
| super.visitMethodCallExpression(expression); |
| if (!MethodCallUtils.isEqualsCall(expression)) { |
| return; |
| } |
| final PsiReferenceExpression methodExpression = expression.getMethodExpression(); |
| final PsiExpression qualifier = methodExpression.getQualifierExpression(); |
| if (qualifier == null) { |
| return; |
| } |
| final PsiExpressionList argumentList = expression.getArgumentList(); |
| final PsiExpression[] arguments = argumentList.getExpressions(); |
| if (arguments.length != 1) { |
| return; |
| } |
| final PsiExpression argument = arguments[0]; |
| if (!EquivalenceChecker.expressionsAreEquivalent(qualifier, argument) || |
| SideEffectChecker.mayHaveSideEffects(qualifier)) { |
| return; |
| } |
| registerMethodCallError(expression); |
| } |
| } |
| } |