| /* |
| * Copyright 2003-2007 Dave Griffith, Bas Leijdekkers |
| * |
| * 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.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.psiutils.ExpressionUtils; |
| import com.siyeh.ig.psiutils.MethodCallUtils; |
| import org.jetbrains.annotations.NotNull; |
| |
| public class ObjectEqualsNullInspection extends BaseInspection { |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message( |
| "object.equals.null.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| public String buildErrorString(Object... infos) { |
| return InspectionGadgetsBundle.message( |
| "object.equals.null.problem.descriptor"); |
| } |
| |
| @Override |
| public boolean isEnabledByDefault() { |
| return true; |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new ObjectEqualsNullVisitor(); |
| } |
| |
| private static class ObjectEqualsNullVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitMethodCallExpression( |
| @NotNull PsiMethodCallExpression call) { |
| super.visitMethodCallExpression(call); |
| if (!MethodCallUtils.isEqualsCall(call)) { |
| return; |
| } |
| final PsiExpressionList argumentList = call.getArgumentList(); |
| final PsiExpression[] args = argumentList.getExpressions(); |
| if (args.length == 0 || !ExpressionUtils.isNullLiteral(args[0])) { |
| return; |
| } |
| registerError(args[0]); |
| } |
| } |
| } |