| /* |
| * 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.*; |
| import com.intellij.psi.util.PsiUtil; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.psiutils.ExpressionUtils; |
| import org.jetbrains.annotations.NotNull; |
| |
| public class NullArgumentToVariableArgMethodInspection |
| extends BaseInspection { |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message( |
| "null.argument.to.var.arg.method.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| public String buildErrorString(Object... infos) { |
| return InspectionGadgetsBundle.message( |
| "null.argument.to.var.arg.method.problem.descriptor"); |
| } |
| |
| @Override |
| public boolean isEnabledByDefault() { |
| return true; |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new NullArgumentToVariableArgVisitor(); |
| } |
| |
| private static class NullArgumentToVariableArgVisitor |
| extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitMethodCallExpression( |
| @NotNull PsiMethodCallExpression call) { |
| super.visitMethodCallExpression(call); |
| |
| if (!PsiUtil.isLanguageLevel5OrHigher(call)) { |
| return; |
| } |
| final PsiExpressionList argumentList = call.getArgumentList(); |
| final PsiExpression[] args = argumentList.getExpressions(); |
| if (args.length == 0) { |
| return; |
| } |
| final PsiExpression lastArg = args[args.length - 1]; |
| if (!ExpressionUtils.isNullLiteral(lastArg)) { |
| return; |
| } |
| final PsiMethod method = call.resolveMethod(); |
| if (method == null) { |
| return; |
| } |
| final PsiParameterList parameterList = method.getParameterList(); |
| if (parameterList.getParametersCount() != args.length) { |
| return; |
| } |
| final PsiParameter[] parameters = parameterList.getParameters(); |
| final PsiParameter lastParameter = |
| parameters[parameters.length - 1]; |
| if (!lastParameter.isVarArgs()) { |
| return; |
| } |
| registerError(lastArg); |
| } |
| } |
| } |