/*
* Copyright 2000-2016 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.util.gist;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.fileTypes.FileType;
import com.intellij.openapi.fileTypes.LanguageFileType;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Key;
import com.intellij.openapi.util.ModificationTracker;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.vfs.newvfs.NewVirtualFile;
import com.intellij.psi.PsiDocumentManager;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiManager;
import com.intellij.psi.impl.source.PsiFileImpl;
import com.intellij.psi.util.CachedValue;
import com.intellij.psi.util.CachedValueProvider;
import com.intellij.psi.util.CachedValuesManager;
import com.intellij.util.NullableFunction;
import com.intellij.util.indexing.FileContentImpl;
import com.intellij.util.io.DataExternalizer;
import org.jetbrains.annotations.NotNull;
/**
* @author peter
*/
class PsiFileGistImpl<Data> implements PsiFileGist<Data> {
private static final ModificationTracker ourReindexTracker = () -> ((GistManagerImpl)GistManager.getInstance()).getReindexCount();
private final VirtualFileGist<Data> myPersistence;
private final VirtualFileGist.GistCalculator<Data> myCalculator;
private final Key<CachedValue<Data>> myCacheKey;
PsiFileGistImpl(@NotNull String id,
int version,
@NotNull DataExternalizer<Data> externalizer,
@NotNull NullableFunction<PsiFile, Data> calculator) {
myCalculator = (project, file) -> {
PsiFile psiFile = getPsiFile(project, file);
return psiFile == null ? null : calculator.fun(psiFile);
};
myPersistence = GistManager.getInstance().newVirtualFileGist(id, version, externalizer, myCalculator);
myCacheKey = Key.create("PsiFileGist " + id);
}
@Override
public Data getFileData(@NotNull PsiFile file) {
ApplicationManager.getApplication().assertReadAccessAllowed();
if (shouldUseMemoryStorage(file)) {
return CachedValuesManager.getManager(file.getProject()).getCachedValue(
file, myCacheKey, () -> {
Data data = myCalculator.calcData(file.getProject(), file.getViewProvider().getVirtualFile());
return CachedValueProvider.Result.create(data, file, ourReindexTracker);
}, false);
}
file.putUserData(myCacheKey, null);
return myPersistence.getFileData(file.getProject(), file.getVirtualFile());
}
private static boolean shouldUseMemoryStorage(PsiFile file) {
if (!(file.getVirtualFile() instanceof NewVirtualFile)) return true;
PsiDocumentManager pdm = PsiDocumentManager.getInstance(file.getProject());
Document document = pdm.getCachedDocument(file);
return document != null && (pdm.isUncommited(document) || FileDocumentManager.getInstance().isDocumentUnsaved(document));
}
private static PsiFile getPsiFile(@NotNull Project project, @NotNull VirtualFile file) {
PsiFile psi = PsiManager.getInstance(project).findFile(file);
if (psi == null || !(psi instanceof PsiFileImpl) || ((PsiFileImpl)psi).isContentsLoaded()) {
return psi;
}
FileType fileType = file.getFileType();
if (!(fileType instanceof LanguageFileType)) return null;
return FileContentImpl.createFileFromText(project, psi.getViewProvider().getContents(), (LanguageFileType)fileType, file, file.getName());
}
}