| /* |
| * Copyright 2003-2013 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.tree.IElementType; |
| import com.intellij.psi.util.PsiSuperMethodUtil; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.psiutils.ClassUtils; |
| import com.siyeh.ig.psiutils.MethodUtils; |
| import org.jetbrains.annotations.NotNull; |
| |
| public class SubtractionInCompareToInspection extends BaseInspection { |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message("subtraction.in.compareto.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| public String buildErrorString(Object... infos) { |
| return InspectionGadgetsBundle.message("subtraction.in.compareto.problem.descriptor"); |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new SubtractionInCompareToVisitor(); |
| } |
| |
| private static class SubtractionInCompareToVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitPolyadicExpression(PsiPolyadicExpression expression) { |
| super.visitPolyadicExpression(expression); |
| final IElementType tokenType = expression.getOperationTokenType(); |
| if (!tokenType.equals(JavaTokenType.MINUS)) { |
| return; |
| } |
| final PsiMethod method = PsiTreeUtil.getParentOfType(expression, PsiMethod.class, true, PsiClass.class); |
| if (method == null) { |
| return; |
| } |
| if (MethodUtils.isCompareTo(method)) { |
| registerError(expression); |
| } |
| final PsiClass comparatorClass = ClassUtils.findClass(CommonClassNames.JAVA_UTIL_COMPARATOR, expression); |
| if (comparatorClass == null) { |
| return; |
| } |
| final PsiMethod[] methods = comparatorClass.findMethodsByName("compare", false); |
| assert methods.length == 1; |
| final PsiMethod compareMethod = methods[0]; |
| if (!PsiSuperMethodUtil.isSuperMethod(method, compareMethod)) { |
| return; |
| } |
| registerError(expression); |
| } |
| } |
| } |