| /* |
| * Copyright 2000-2013 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.jetbrains.python.psi.impl; |
| |
| import com.intellij.psi.PsiElement; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * @author yole |
| */ |
| public class TypeEvalStack { |
| private static ThreadLocal<TypeEvalStack> STACK = new ThreadLocal<TypeEvalStack>() { |
| @Override |
| protected TypeEvalStack initialValue() { |
| return new TypeEvalStack(); |
| } |
| }; |
| |
| private final Set<PsiElement> myBeingEvaluated = new HashSet<PsiElement>(); |
| |
| public static boolean mayEvaluate(PsiElement element) { |
| final TypeEvalStack curStack = STACK.get(); |
| if (curStack.myBeingEvaluated.contains(element)) { |
| return false; |
| } |
| curStack.myBeingEvaluated.add(element); |
| return true; |
| } |
| |
| public static void evaluated(PsiElement element) { |
| final TypeEvalStack curStack = STACK.get(); |
| curStack.myBeingEvaluated.remove(element); |
| } |
| } |