| /* |
| * Copyright 2000-2009 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.intellij.refactoring.rename; |
| |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.intellij.refactoring.util.RefactoringUtil; |
| import com.intellij.usageView.UsageInfo; |
| |
| import java.util.List; |
| |
| public class JavaUnresolvableLocalCollisionDetector { |
| private static final Logger LOG = Logger.getInstance("#com.intellij.refactoring.rename.JavaUnresolvableLocalCollisionDetector"); |
| |
| private JavaUnresolvableLocalCollisionDetector() { |
| } |
| |
| public static void findCollisions(final PsiElement element, final String newName, final List<UsageInfo> result) { |
| if (!(element instanceof PsiLocalVariable || element instanceof PsiParameter)) { |
| return; |
| } |
| |
| |
| PsiElement scope; |
| PsiElement anchor = null; |
| if (element instanceof PsiLocalVariable) { |
| scope = RefactoringUtil.getVariableScope((PsiLocalVariable)element); |
| if (!(element instanceof ImplicitVariable)) { |
| anchor = element.getParent(); |
| } |
| } |
| else { |
| // element is a PsiParameter |
| scope = ((PsiParameter)element).getDeclarationScope(); |
| } |
| LOG.assertTrue(scope != null, element.getClass().getName()); |
| |
| final CollidingVariableVisitor collidingNameVisitor = new CollidingVariableVisitor() { |
| public void visitCollidingElement(PsiVariable collidingVariable) { |
| if (collidingVariable.equals(element)) return; |
| LocalHidesRenamedLocalUsageInfo collision = new LocalHidesRenamedLocalUsageInfo(element, collidingVariable); |
| result.add(collision); |
| } |
| }; |
| |
| visitLocalsCollisions(element, newName, scope, anchor, collidingNameVisitor); |
| |
| |
| /*PsiElement place = scope.getLastChild(); |
| PsiResolveHelper helper = place.getManager().getResolveHelper(); |
| PsiVariable refVar = helper.resolveReferencedVariable(newName, place, null); |
| |
| if (refVar != null) { |
| LocalHidesRenamedLocalUsageInfo collision = new LocalHidesRenamedLocalUsageInfo(element, refVar); |
| result.add(collision); |
| }*/ |
| } |
| |
| public static void visitLocalsCollisions(PsiElement element, final String newName, |
| PsiElement scope, |
| PsiElement place, |
| final CollidingVariableVisitor collidingNameVisitor) { |
| if (scope == null) return; |
| visitDownstreamCollisions(scope, place, newName, collidingNameVisitor); |
| visitUpstreamLocalCollisions(element, scope, newName, collidingNameVisitor); |
| } |
| |
| private static void visitDownstreamCollisions(PsiElement scope, PsiElement place, final String newName, |
| final CollidingVariableVisitor collidingNameVisitor |
| ) { |
| ConflictingLocalVariablesVisitor collector = |
| new ConflictingLocalVariablesVisitor(newName, collidingNameVisitor); |
| if (place == null) { |
| scope.accept(collector); |
| } |
| else { |
| LOG.assertTrue(place.getParent() == scope); |
| for (PsiElement sibling = place; sibling != null; sibling = sibling.getNextSibling()) { |
| sibling.accept(collector); |
| } |
| |
| } |
| } |
| |
| public interface CollidingVariableVisitor { |
| void visitCollidingElement(PsiVariable collidingVariable); |
| } |
| |
| private static void visitUpstreamLocalCollisions(PsiElement element, PsiElement scope, |
| String newName, |
| final CollidingVariableVisitor collidingNameVisitor) { |
| final PsiVariable collidingVariable = |
| JavaPsiFacade.getInstance(scope.getProject()).getResolveHelper().resolveAccessibleReferencedVariable(newName, scope); |
| if (collidingVariable instanceof PsiLocalVariable || collidingVariable instanceof PsiParameter) { |
| final PsiElement commonParent = PsiTreeUtil.findCommonParent(element, collidingVariable); |
| if (commonParent != null) { |
| PsiElement current = element; |
| while (current != null && current != commonParent) { |
| if (current instanceof PsiMethod || current instanceof PsiClass) { |
| return; |
| } |
| current = current.getParent(); |
| } |
| } |
| collidingNameVisitor.visitCollidingElement(collidingVariable); |
| } |
| } |
| |
| public static class ConflictingLocalVariablesVisitor extends JavaRecursiveElementWalkingVisitor { |
| protected final String myName; |
| protected CollidingVariableVisitor myCollidingNameVisitor; |
| |
| public ConflictingLocalVariablesVisitor(String newName, CollidingVariableVisitor collidingNameVisitor) { |
| myName = newName; |
| myCollidingNameVisitor = collidingNameVisitor; |
| } |
| |
| @Override public void visitReferenceExpression(PsiReferenceExpression expression) { |
| visitElement(expression); |
| } |
| |
| @Override |
| public void visitField(PsiField field) { |
| if (myName.equals(field.getName())) { |
| myCollidingNameVisitor.visitCollidingElement(field); |
| } |
| } |
| |
| @Override public void visitVariable(PsiVariable variable) { |
| if (myName.equals(variable.getName())) { |
| myCollidingNameVisitor.visitCollidingElement(variable); |
| } |
| } |
| } |
| |
| |
| |
| } |