| /* |
| * Copyright 2006-2007 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.dataflow; |
| |
| import com.intellij.codeInspection.ui.SingleCheckboxOptionsPanel; |
| import com.intellij.openapi.util.Key; |
| import com.intellij.psi.*; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.psiutils.LibraryUtil; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import javax.swing.*; |
| |
| public class LawOfDemeterInspection extends BaseInspection { |
| |
| @SuppressWarnings({"PublicField"}) |
| public boolean ignoreLibraryCalls = true; |
| |
| private static final Key<Integer> key = |
| Key.create("LawOfDemeterInspection"); |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message("law.of.demeter.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| protected String buildErrorString(Object... infos) { |
| return InspectionGadgetsBundle.message( |
| "law.of.demeter.problem.descriptor"); |
| } |
| |
| @Override |
| @Nullable |
| public JComponent createOptionsPanel() { |
| return new SingleCheckboxOptionsPanel(InspectionGadgetsBundle.message( |
| "law.of.demeter.ignore.library.calls.option"), this, |
| "ignoreLibraryCalls"); |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new LawOfDemeterVisitor(); |
| } |
| |
| private class LawOfDemeterVisitor extends BaseInspectionVisitor { |
| |
| private static final int threshold = 2; |
| |
| @Override |
| public void visitMethodCallExpression( |
| PsiMethodCallExpression expression) { |
| super.visitMethodCallExpression(expression); |
| if (ignoreLibraryCalls && |
| LibraryUtil.callOnLibraryMethod(expression)) { |
| return; |
| } |
| expression.putUserData(key, Integer.valueOf(1)); |
| checkParents(expression, Integer.valueOf(1)); |
| } |
| |
| public void checkParents(PsiExpression expression, Integer count) { |
| final PsiElement parent = expression.getParent(); |
| if (parent instanceof PsiLocalVariable) { |
| final Integer localCount = expression.getUserData(key); |
| parent.putUserData(key, localCount); |
| } |
| else if (parent instanceof PsiAssignmentExpression) { |
| final PsiAssignmentExpression assignmentExpression = |
| (PsiAssignmentExpression)parent; |
| final PsiExpression lhs = assignmentExpression.getLExpression(); |
| if (!(lhs instanceof PsiReferenceExpression)) { |
| return; |
| } |
| final PsiReferenceExpression referenceExpression = |
| (PsiReferenceExpression)lhs; |
| final PsiElement element = referenceExpression.resolve(); |
| if (!(element instanceof PsiLocalVariable)) { |
| return; |
| } |
| final Integer localCount = expression.getUserData(key); |
| element.putUserData(key, localCount); |
| } |
| else if (parent instanceof PsiReferenceExpression) { |
| final PsiElement grandParent = parent.getParent(); |
| if (!(grandParent instanceof PsiMethodCallExpression)) { |
| return; |
| } |
| final PsiMethodCallExpression methodCallExpression = |
| (PsiMethodCallExpression)grandParent; |
| final Integer userData = grandParent.getUserData(key); |
| if (userData == null) { |
| return; |
| } |
| final int localCount = userData.intValue(); |
| final int newCount = localCount + count.intValue(); |
| if (newCount == threshold) { |
| registerMethodCallError(methodCallExpression); |
| } |
| grandParent.putUserData(key, Integer.valueOf(newCount)); |
| checkParents(methodCallExpression, count); |
| } |
| } |
| |
| @Override |
| public void visitReferenceExpression( |
| PsiReferenceExpression expression) { |
| super.visitReferenceExpression(expression); |
| final PsiElement parent = expression.getParent(); |
| if (!(parent instanceof PsiReferenceExpression)) { |
| return; |
| } |
| final PsiElement element = expression.resolve(); |
| if (!(element instanceof PsiLocalVariable)) { |
| return; |
| } |
| final Integer count = element.getUserData(key); |
| if (count != null) { |
| checkParents(expression, count); |
| } |
| } |
| } |
| } |