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/*
* Copyright 2000-2014 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.openapi.command.impl;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.command.undo.DocumentReference;
import com.intellij.openapi.command.undo.DocumentReferenceManager;
import com.intellij.openapi.components.ApplicationComponent;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.util.Key;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.vfs.VirtualFileAdapter;
import com.intellij.openapi.vfs.VirtualFileEvent;
import com.intellij.openapi.vfs.VirtualFileManager;
import com.intellij.openapi.vfs.newvfs.NewVirtualFile;
import com.intellij.reference.SoftReference;
import com.intellij.util.containers.WeakKeyWeakValueHashMap;
import com.intellij.util.containers.WeakValueHashMap;
import com.intellij.util.io.fs.FilePath;
import org.jetbrains.annotations.NotNull;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class DocumentReferenceManagerImpl extends DocumentReferenceManager implements ApplicationComponent {
private static final Key<List<VirtualFile>> DELETED_FILES = Key.create(DocumentReferenceManagerImpl.class.getName() + ".DELETED_FILES");
private final Map<Document, DocumentReference> myDocToRef = new WeakKeyWeakValueHashMap<Document, DocumentReference>();
private static final Key<Reference<DocumentReference>> FILE_TO_REF_KEY = Key.create("FILE_TO_REF_KEY");
private final Map<FilePath, DocumentReference> myDeletedFilePathToRef = new WeakValueHashMap<FilePath, DocumentReference>();
@Override
@NotNull
public String getComponentName() {
return getClass().getSimpleName();
}
@Override
public void initComponent() {
VirtualFileManager.getInstance().addVirtualFileListener(new VirtualFileAdapter() {
@Override
public void fileCreated(@NotNull VirtualFileEvent event) {
VirtualFile f = event.getFile();
DocumentReference ref = myDeletedFilePathToRef.remove(new FilePath(f.getUrl()));
if (ref != null) {
f.putUserData(FILE_TO_REF_KEY, new WeakReference<DocumentReference>(ref));
((DocumentReferenceByVirtualFile)ref).update(f);
}
}
@Override
public void beforeFileDeletion(@NotNull VirtualFileEvent event) {
VirtualFile f = event.getFile();
f.putUserData(DELETED_FILES, collectDeletedFiles(f, new ArrayList<VirtualFile>()));
}
@Override
public void fileDeleted(@NotNull VirtualFileEvent event) {
VirtualFile f = event.getFile();
List<VirtualFile> files = f.getUserData(DELETED_FILES);
f.putUserData(DELETED_FILES, null);
assert files != null : f;
for (VirtualFile each : files) {
DocumentReference ref = SoftReference.dereference(each.getUserData(FILE_TO_REF_KEY));
each.putUserData(FILE_TO_REF_KEY, null);
if (ref != null) {
myDeletedFilePathToRef.put(new FilePath(each.getUrl()), ref);
}
}
}
});
}
private static List<VirtualFile> collectDeletedFiles(VirtualFile f, List<VirtualFile> files) {
if (!(f instanceof NewVirtualFile)) return files;
if (!f.isDirectory()) {
files.add(f);
}
else {
for (VirtualFile each : ((NewVirtualFile)f).iterInDbChildren()) {
collectDeletedFiles(each, files);
}
}
return files;
}
@Override
public void disposeComponent() {
}
@NotNull
@Override
public DocumentReference create(@NotNull Document document) {
assertInDispatchThread();
VirtualFile file = FileDocumentManager.getInstance().getFile(document);
return file == null ? createFromDocument(document) : create(file);
}
@NotNull
private DocumentReference createFromDocument(@NotNull final Document document) {
DocumentReference result = myDocToRef.get(document);
if (result == null) {
result = new DocumentReferenceByDocument(document);
myDocToRef.put(document, result);
}
return result;
}
@NotNull
@Override
public DocumentReference create(@NotNull VirtualFile file) {
assertInDispatchThread();
assert file.isValid() : "file is invalid: " + file;
DocumentReference result = SoftReference.dereference(file.getUserData(FILE_TO_REF_KEY));
if (result == null) {
result = new DocumentReferenceByVirtualFile(file);
file.putUserData(FILE_TO_REF_KEY, new WeakReference<DocumentReference>(result));
}
return result;
}
private static void assertInDispatchThread() {
ApplicationManager.getApplication().assertIsDispatchThread();
}
}
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