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/*****************************************************************************
* Copyright (c) 2015, 2016 Christian W. Damus and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.editor.welcome.internal.modelelements;
import java.util.Collection;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.papyrus.infra.core.language.ILanguage;
import org.eclipse.papyrus.infra.core.language.ILanguageChangeListener;
import org.eclipse.papyrus.infra.core.language.ILanguageService;
import org.eclipse.papyrus.infra.core.language.LanguageChangeEvent;
import org.eclipse.papyrus.infra.core.resource.ModelSet;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.editor.welcome.internal.Activator;
import org.eclipse.papyrus.infra.emf.utils.ServiceUtilsForResourceSet;
import org.eclipse.papyrus.infra.tools.databinding.WritableListWithIterator;
/**
* A list property of the {@code LanguageObservable}s encapsulating the
* {@link ILanguage}s instantiated in the model.
*/
public class LanguagesObservableProperty implements Supplier<IObservableList<LanguageObservable>> {
private ILanguageService languageService;
private ILanguageChangeListener languagesListener;
private IObservableList<LanguageObservable> list;
public LanguagesObservableProperty(WelcomeModelElement owner) {
super();
this.list = new WritableListWithIterator.Containment<>(LanguageObservable.class);
try {
this.languageService = ServiceUtilsForResourceSet.getInstance().getService(ILanguageService.class, owner.getDomain().getResourceSet());
hookLanguagesListener();
list.addDisposeListener(event -> {
languageService.removeLanguageChangeListener(languagesListener);
languagesListener = null;
languageService = null;
});
} catch (ServiceException e) {
Activator.log.error("Cannot obtain language service. Languages will not be shown.", e); //$NON-NLS-1$
}
}
@Override
public IObservableList<LanguageObservable> get() {
return list;
}
void hookLanguagesListener() {
languagesListener = event -> {
switch (event.getType()) {
case LanguageChangeEvent.ADDED:
list.addAll(event.getLanguages().stream().map(LanguageObservable::new).collect(Collectors.toList()));
break;
case LanguageChangeEvent.REMOVED:
list.removeAll(getObservables(event.getLanguages()));
break;
}
};
ModelSet modelSet = languageService.getAdapter(ModelSet.class);
list.addAll(languageService.getLanguages(modelSet.getURIWithoutExtension(), false).stream().map(LanguageObservable::new).collect(Collectors.toList()));
languageService.addLanguageChangeListener(languagesListener);
}
Collection<LanguageObservable> getObservables(Collection<? extends ILanguage> languages) {
return list.stream().filter(o -> languages.contains(o.getLanguage())).collect(Collectors.toList());
}
}
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