/*
* Copyright 2003-2017 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 jetbrains.mps.project;
import jetbrains.mps.library.ModuleFileTracker;
import jetbrains.mps.project.structure.project.ModulePath;
import jetbrains.mps.vfs.FileListener;
import jetbrains.mps.vfs.FileSystemEvent;
import jetbrains.mps.vfs.FileSystems;
import jetbrains.mps.vfs.IFile;
import jetbrains.mps.vfs.openapi.FileSystem;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.mps.openapi.module.SModule;
import org.jetbrains.mps.openapi.util.ProgressMonitor;
/**
* Listens for module descriptor paths in a project descriptor.
* Files created with a path that did not exist at the moment project was last initialized, trigger project update.
* Changes to descriptor files drop or reload respective project modules.
*
* @author Alexey Pyshkin
* @author Artem Tikhomirov
*/
public class ModuleFileChangeListener implements ProjectModuleLoadingListener {
private final MPSProject myMpsProject;
/*
* tracks changes and removals of files with descriptors of project modules
*/
private final ModuleFileTracker myDescriptorChangeListener = new ModuleFileTracker(true);
/*
* tracks files known to host a project's module but not existent at the moment project is initialized.
*/
private final FileListener myMissingFileListener = new FileListener() {
@Override
public void update(ProgressMonitor monitor, @NotNull FileSystemEvent event) {
for (IFile file : event.getCreated()) {
file.removeListener(this);
}
if (!event.getCreated().isEmpty()) {
myMpsProject.update();
}
}
};
ModuleFileChangeListener(MPSProject mpsProject) {
myMpsProject = mpsProject;
}
@Override
public void moduleLoaded(ModulePath modulePath, @NotNull SModule module) {
if (module instanceof AbstractModule) {
FileSystem fileSystem = ((AbstractModule) module).getFileSystem();
myDescriptorChangeListener.track(fileSystem.getFile(modulePath.getPath()), module);
}
}
@Override
public void moduleRemoved(ModulePath modulePath, @NotNull SModule module) {
if (module instanceof AbstractModule) {
FileSystem fileSystem = ((AbstractModule) module).getFileSystem();
myDescriptorChangeListener.forget(fileSystem.getFile(modulePath.getPath()), module);
}
}
@Override
public void moduleNotFound(@NotNull final ModulePath modulePath) {
FileSystems.getDefault().getFile(modulePath.getPath()).addListener(myMissingFileListener);
}
@Override
public void moduleTypeIsUnknown(@NotNull ModulePath modulePath) {
}
}