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/*
* 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.psi;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.util.WalkingState;
import org.jetbrains.annotations.NotNull;
/**
* @author cdr
*/
public abstract class PsiWalkingState extends WalkingState<PsiElement> {
private static final Logger LOG = Logger.getInstance("#com.intellij.psi.PsiWalkingState");
private final PsiElementVisitor myVisitor;
private static class PsiTreeGuide implements TreeGuide<PsiElement> {
@Override
public PsiElement getNextSibling(@NotNull PsiElement element) {
return element.getNextSibling();
}
@Override
public PsiElement getPrevSibling(@NotNull PsiElement element) {
return element.getPrevSibling();
}
@Override
public PsiElement getFirstChild(@NotNull PsiElement element) {
return element.getFirstChild();
}
@Override
public PsiElement getParent(@NotNull PsiElement element) {
return element.getParent();
}
private static final PsiTreeGuide instance = new PsiTreeGuide();
}
protected PsiWalkingState(@NotNull PsiElementVisitor delegate) {
super(PsiTreeGuide.instance);
myVisitor = delegate;
}
@Override
public void visit(@NotNull PsiElement element) {
element.accept(myVisitor);
}
@Override
public void elementStarted(@NotNull PsiElement element) {
if (!startedWalking && element instanceof PsiCompiledElement) {
LOG.error(element+"; Do not use walking visitor inside compiled PSI since getNextSibling() is too slow there");
}
super.elementStarted(element);
}
}
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