java/openapi/src/com/intellij/psi/JavaRecursiveElementWalkingVisitor.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 /*
  18  * @author max
  19  */
  20 package com.intellij.psi;
  21
  22 import org.jetbrains.annotations.NotNull;
  23
  24 public abstract class JavaRecursiveElementWalkingVisitor extends JavaElementVisitor {
  25   private final PsiWalkingState myWalkingState = new PsiWalkingState(this){
  26     public void elementFinished(@NotNull PsiElement element) {
  27       JavaRecursiveElementWalkingVisitor.this.elementFinished(element);
  28     }
  29   };
  30
  31   @Override
  32   public void visitElement(PsiElement element) {
  33     myWalkingState.elementStarted(element);
  34   }
  35
  36   @SuppressWarnings({"UnusedDeclaration"})
  37   protected void elementFinished(PsiElement element) {
  38   }
  39
  40   @Override public void visitReferenceExpression(PsiReferenceExpression expression) {
  41     visitExpression(expression);
  42     myWalkingState.startedWalking(); // do not traverse from scratch
  43     visitReferenceElement(expression);
  44   }
  45
  46   public void stopWalking() {
  47     myWalkingState.stopWalking();
  48   }
  49 }