/**
* Copyright 2014 Microsoft Open Technologies Inc.
*
* 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.microsoftopentechnologies.intellij.helpers;
import com.google.common.collect.ImmutableList;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.project.ProjectLocator;
import com.intellij.openapi.project.ProjectManager;
import com.intellij.openapi.vfs.*;
import org.jetbrains.annotations.NotNull;
import java.util.*;
import java.util.concurrent.locks.ReentrantLock;
public class ProjectFileMonitor implements VirtualFileListener {
private static ProjectFileMonitor projectFileMonitor = null;
private static ReentrantLock instanceLock = new ReentrantLock();
private Map<Project, List<VirtualFileListener>> projectFileListenersMap = new HashMap<Project, List<VirtualFileListener>>();
private ReentrantLock projectFileListenersMapLock = new ReentrantLock();
private boolean fileListenerRegistered = false;
private ReentrantLock registrationLock = new ReentrantLock();
private interface FileListenerDelegate {
public abstract void run(VirtualFileListener fileListener);
}
private ProjectFileMonitor() {
}
public void addProjectFileListener(Project project, VirtualFileListener fileListener) {
projectFileListenersMapLock.lock();
try {
// lazily register this object with the virtual file manager
if(!fileListenerRegistered) {
registrationLock.lock();
try {
if(!fileListenerRegistered) {
VirtualFileManager.getInstance().addVirtualFileListener(this);
fileListenerRegistered = true;
}
}
finally {
registrationLock.unlock();
}
}
if(!projectFileListenersMap.containsKey(project)) {
projectFileListenersMap.put(project, new ArrayList<VirtualFileListener>());
}
List<VirtualFileListener> fileListeners = projectFileListenersMap.get(project);
if(!fileListeners.contains(fileListener)) {
fileListeners.add(fileListener);
}
}
finally {
projectFileListenersMapLock.unlock();
}
}
public void removeProjectFileListener(Project project, VirtualFileListener fileListener) {
projectFileListenersMapLock.lock();
try {
if(projectFileListenersMap.containsKey(project)) {
List<VirtualFileListener> fileListeners = projectFileListenersMap.get(project);
if(fileListeners.contains(fileListener)) {
fileListeners.remove(fileListener);
if(fileListeners.isEmpty()) {
projectFileListenersMap.remove(project);
}
}
}
// if there are no more project file listeners then unregister this object
// from the virtual file manager
if(projectFileListenersMap.isEmpty()) {
registrationLock.lock();
try {
if(projectFileListenersMap.isEmpty()) {
VirtualFileManager.getInstance().removeVirtualFileListener(this);
fileListenerRegistered = false;
}
}
finally {
registrationLock.unlock();
}
}
}
finally {
projectFileListenersMapLock.unlock();
}
}
private void fireEventForProject(VirtualFileEvent fileEvent, FileListenerDelegate action) {
projectFileListenersMapLock.lock();
try {
Project project = guessProjectForFile(fileEvent.getFile());
if (project != null && projectFileListenersMap.containsKey(project)) {
ImmutableList<VirtualFileListener> fileListeners = ImmutableList.copyOf(projectFileListenersMap.get(project));
for(VirtualFileListener fileListener : fileListeners) {
action.run(fileListener);
}
}
}
finally {
projectFileListenersMapLock.unlock();
}
}
private Project guessProjectForFile(VirtualFile virtualFile) {
ProjectManager projectManager = ProjectManager.getInstance();
if(projectManager == null) {
return null;
}
Project[] openProjects = projectManager.getOpenProjects();
if(openProjects.length == 0) {
return null;
}
// if there's only one project open then we assume this file belongs to
// that project
if(openProjects.length == 1 && !openProjects[0].isDisposed()) {
return openProjects[0];
}
// for each open project, see if this file resides in a sub-folder of the project's
// root folder; if yes, then chances are, this file belongs to that project; we
// don't use ProjectLocator.getInstance().guessProjectForFile(virtualFile) because
// when you have multiple projects open it guesses the wrong project for the new files
// when creating a new project
String filePath = virtualFile.getCanonicalPath();
if (filePath != null) {
filePath = filePath.toLowerCase();
for (Project openProject : openProjects) {
if(openProject.isInitialized() && !openProject.isDisposed()) {
String projectPath = openProject.getBaseDir().getCanonicalPath();
if (projectPath != null && filePath.startsWith(projectPath.toLowerCase())) {
return openProject;
}
}
}
}
return null;
}
public static ProjectFileMonitor getInstance() {
if(projectFileMonitor == null) {
instanceLock.lock();
try {
if(projectFileMonitor == null) {
projectFileMonitor = new ProjectFileMonitor();
}
}
finally {
instanceLock.unlock();
}
}
return projectFileMonitor;
}
public void propertyChanged(@NotNull final VirtualFilePropertyEvent event) {
fireEventForProject(event, new FileListenerDelegate() {
@Override
public void run(VirtualFileListener fileListener) {
fileListener.propertyChanged(event);
}
});
}
public void contentsChanged(@NotNull final VirtualFileEvent event) {
fireEventForProject(event, new FileListenerDelegate() {
@Override
public void run(VirtualFileListener fileListener) {
fileListener.contentsChanged(event);
}
});
}
public void fileCreated(@NotNull final VirtualFileEvent event) {
fireEventForProject(event, new FileListenerDelegate() {
@Override
public void run(VirtualFileListener fileListener) {
fileListener.fileCreated(event);
}
});
}
public void fileDeleted(@NotNull final VirtualFileEvent event) {
fireEventForProject(event, new FileListenerDelegate() {
@Override
public void run(VirtualFileListener fileListener) {
fileListener.fileDeleted(event);
}
});
}
public void fileMoved(@NotNull final VirtualFileMoveEvent event) {
fireEventForProject(event, new FileListenerDelegate() {
@Override
public void run(VirtualFileListener fileListener) {
fileListener.fileMoved(event);
}
});
}
public void fileCopied(@NotNull final VirtualFileCopyEvent event) {
fireEventForProject(event, new FileListenerDelegate() {
@Override
public void run(VirtualFileListener fileListener) {
fileListener.fileCopied(event);
}
});
}
public void beforePropertyChange(@NotNull final VirtualFilePropertyEvent event) {
fireEventForProject(event, new FileListenerDelegate() {
@Override
public void run(VirtualFileListener fileListener) {
fileListener.beforePropertyChange(event);
}
});
}
public void beforeContentsChange(@NotNull final VirtualFileEvent event) {
fireEventForProject(event, new FileListenerDelegate() {
@Override
public void run(VirtualFileListener fileListener) {
fileListener.beforeContentsChange(event);
}
});
}
public void beforeFileDeletion(@NotNull final VirtualFileEvent event) {
fireEventForProject(event, new FileListenerDelegate() {
@Override
public void run(VirtualFileListener fileListener) {
fileListener.beforeFileDeletion(event);
}
});
}
public void beforeFileMovement(@NotNull final VirtualFileMoveEvent event) {
fireEventForProject(event, new FileListenerDelegate() {
@Override
public void run(VirtualFileListener fileListener) {
fileListener.beforeFileMovement(event);
}
});
}
}