diff options
Diffstat (limited to 'plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/bugs/EqualsWithItselfInspection.java')
-rw-r--r-- | plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/bugs/EqualsWithItselfInspection.java | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/bugs/EqualsWithItselfInspection.java b/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/bugs/EqualsWithItselfInspection.java new file mode 100644 index 000000000000..698ace189a6b --- /dev/null +++ b/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/bugs/EqualsWithItselfInspection.java @@ -0,0 +1,78 @@ +/* + * 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); + } + } +} |