/*
* Copyright 2003-2016 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 jetbrains.mps.nodeEditor.highlighter;
import jetbrains.mps.RuntimeFlags;
import jetbrains.mps.smodel.GlobalSModelEventsManager;
import jetbrains.mps.smodel.RepoListenerRegistrar;
import jetbrains.mps.smodel.event.SModelCommandListener;
import jetbrains.mps.smodel.event.SModelEvent;
import jetbrains.mps.smodel.event.SModelReplacedEvent;
import org.jetbrains.mps.openapi.model.SModel;
import org.jetbrains.mps.openapi.module.SRepository;
import org.jetbrains.mps.openapi.module.SRepositoryContentAdapter;
import java.util.ArrayList;
import java.util.List;
/**
* Listens to model events and records them into a list. Thread-safe. Also converts a "model replaced" event received through
* {@link org.jetbrains.mps.openapi.model.SModelListener#modelReplaced(SModel)} to {@link SModelReplacedEvent}.
*/
public class HighlighterEventCollector {
private final Object myEventsLock = new Object();
private final List<SModelEvent> myLastEvents = new ArrayList<SModelEvent>();
private final SModelCommandListener myAddCommandEventsListener = new SModelCommandListener() {
@Override
public void eventsHappenedInCommand(List<SModelEvent> events) {
if (RuntimeFlags.isTestMode()) return;
synchronized (myEventsLock) {
myLastEvents.addAll(events);
}
}
};
// Listen to modelReplaced event.
private final SRepositoryContentAdapter myModelReloadListener = new SRepositoryContentAdapter() {
@Override
protected void startListening(SModel model) {
model.addModelListener(this);
}
@Override
protected void stopListening(SModel model) {
model.removeModelListener(this);
}
@Override
public void modelReplaced(SModel model) {
synchronized (myEventsLock) {
myLastEvents.add(new SModelReplacedEvent(model));
}
}
};
/**
* Returns a copy of the internal list of collected events and clears the internal list.
*/
public List<SModelEvent> drainEvents() {
final List<SModelEvent> events = new ArrayList<SModelEvent>();
synchronized (myEventsLock) {
events.addAll(myLastEvents);
myLastEvents.clear();
}
return events;
}
/**
* Attach listeners to specified components.
*/
public void startListening(GlobalSModelEventsManager globalSModelEventsManager, SRepository repository) {
globalSModelEventsManager.addGlobalCommandListener(myAddCommandEventsListener);
new RepoListenerRegistrar(repository, myModelReloadListener).attach();
}
/**
* Detach listeners previously attached to the components.
*/
public void stopListening(GlobalSModelEventsManager globalSModelEventsManager, SRepository repository) {
new RepoListenerRegistrar(repository, myModelReloadListener).detach();
globalSModelEventsManager.removeGlobalCommandListener(myAddCommandEventsListener);
}
}