/*
* Copyright 2000-2015 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.impl.smartPointers;
import com.intellij.lang.LanguageUtil;
import com.intellij.openapi.application.ReadAction;
import com.intellij.openapi.util.Comparing;
import com.intellij.openapi.util.ProperTextRange;
import com.intellij.openapi.util.Segment;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.PsiAnchor;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.impl.source.PsiFileWithStubSupport;
import com.intellij.psi.stubs.IStubElementType;
import com.intellij.psi.tree.IElementType;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* User: cdr
*/
class AnchorElementInfo extends SelfElementInfo {
private volatile long myStubElementTypeAndId; // stubId in the lower 32 bits; stubElementTypeIndex in the high 32 bits packed together for atomicity
AnchorElementInfo(@NotNull PsiElement anchor, @NotNull PsiFile containingFile, Identikit.ByAnchor identikit) {
super(containingFile.getProject(), ProperTextRange.create(anchor.getTextRange()), identikit, containingFile, false);
myStubElementTypeAndId = pack(-1, null);
}
// will restore by stub index until file tree get loaded
AnchorElementInfo(@NotNull PsiElement anchor,
@NotNull PsiFileWithStubSupport containingFile,
int stubId,
@NotNull IStubElementType stubElementType) {
super(containingFile.getProject(), null,
Identikit.fromTypes(anchor.getClass(), stubElementType, LanguageUtil.getRootLanguage(containingFile)),
containingFile, false);
myStubElementTypeAndId = pack(stubId, stubElementType);
assert !(anchor instanceof PsiFile) : "FileElementInfo must be used for file: "+anchor;
}
private static long pack(int stubId, IStubElementType stubElementType) {
short index = stubElementType == null ? 0 : stubElementType.getIndex();
assert index >= 0 : "Unregistered token types not allowed here: " + stubElementType;
return ((long)stubId) | ((long)index << 32);
}
private int getStubId() {
return (int)myStubElementTypeAndId;
}
@Override
@Nullable
public PsiElement restoreElement() {
long typeAndId = myStubElementTypeAndId;
int stubId = (int)typeAndId;
if (stubId != -1) {
PsiFile file = restoreFile();
if (!(file instanceof PsiFileWithStubSupport)) return null;
short index = (short)(typeAndId >> 32);
IStubElementType stubElementType = (IStubElementType)IElementType.find(index);
return PsiAnchor.restoreFromStubIndex((PsiFileWithStubSupport)file, stubId, stubElementType, false);
}
return super.restoreElement();
}
@Override
public boolean pointsToTheSameElementAs(@NotNull final SmartPointerElementInfo other) {
if (other instanceof AnchorElementInfo) {
if (!getVirtualFile().equals(other.getVirtualFile())) return false;
long packed1 = myStubElementTypeAndId;
long packed2 = ((AnchorElementInfo)other).myStubElementTypeAndId;
if (packed1 != -1 && packed2 != -1) {
return packed1 == packed2;
}
if (packed1 != -1 || packed2 != -1) {
return ReadAction.compute(() -> Comparing.equal(restoreElement(), other.restoreElement()));
}
}
return super.pointsToTheSameElementAs(other);
}
@Override
public void fastenBelt() {
if (getStubId() != -1) {
switchToTree();
}
super.fastenBelt();
}
private void switchToTree() {
PsiElement element = restoreElement();
SmartPointerTracker tracker = myManager.getTracker(getVirtualFile());
if (element != null && tracker != null) {
tracker.switchStubToAst(this, element);
}
}
void switchToTreeRange(@NotNull PsiElement element) {
switchToAnchor(element);
myStubElementTypeAndId = pack(-1, null);
}
@Override
public Segment getRange() {
if (getStubId() != -1) {
switchToTree();
}
return super.getRange();
}
@Nullable
@Override
public TextRange getPsiRange() {
if (getStubId() != -1) {
switchToTree();
}
return super.getPsiRange();
}
@Override
public String toString() {
return super.toString() + ",stubId=" + getStubId();
}
}