/*******************************************************************************
* Copyright (c) 2012-2017 Codenvy, S.A.
* 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:
* Codenvy, S.A. - initial API and implementation
*******************************************************************************/
package org.eclipse.che.ide.preferences;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import org.eclipse.che.api.promises.client.Function;
import org.eclipse.che.api.promises.client.FunctionException;
import org.eclipse.che.api.promises.client.Promise;
import org.eclipse.che.api.promises.client.js.Promises;
import org.eclipse.che.commons.annotation.Nullable;
import org.eclipse.che.ide.api.preferences.PreferencesManager;
import org.eclipse.che.ide.api.user.PreferencesServiceClient;
import java.util.HashMap;
import java.util.Map;
/**
* The implementation of {@link PreferencesManager} for managing user preference.
*
* @author Andrey Plotnikov
*/
@Singleton
public class PreferencesManagerImpl implements PreferencesManager {
private final Map<String, String> changedPreferences;
private final PreferencesServiceClient preferencesService;
private Map<String, String> persistedPreferences;
/**
* Create preferences manager
*
* @param preferencesService
* user preference service client
*/
@Inject
protected PreferencesManagerImpl(PreferencesServiceClient preferencesService) {
this.persistedPreferences = new HashMap<>();
this.changedPreferences = new HashMap<>();
this.preferencesService = preferencesService;
}
/** {@inheritDoc} */
@Override
@Nullable
public String getValue(String preference) {
if (changedPreferences.containsKey(preference)) {
return changedPreferences.get(preference);
}
return persistedPreferences.get(preference);
}
/** {@inheritDoc} */
@Override
public void setValue(String preference, String value) {
changedPreferences.put(preference, value);
}
/** {@inheritDoc} */
@Override
public Promise<Void> flushPreferences() {
if (changedPreferences.isEmpty()) {
return Promises.resolve(null);
}
return preferencesService.updatePreferences(changedPreferences).thenPromise(new Function<Map<String, String>, Promise<Void>>() {
@Override
public Promise<Void> apply(Map<String, String> result) throws FunctionException {
persistedPreferences.putAll(changedPreferences);
changedPreferences.clear();
return Promises.resolve(null);
}
});
}
/** {@inheritDoc} */
@Override
public Promise<Map<String, String>> loadPreferences() {
return preferencesService.getPreferences().then(new Function<Map<String, String>, Map<String, String>>() {
@Override
public Map<String, String> apply(Map<String, String> preferences) throws FunctionException {
persistedPreferences = preferences;
return preferences;
}
});
}
}