/**
* Copyright (C) 2012 Google, 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 org.onebusaway.transit_data.model.service_alerts;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Set;
import org.onebusaway.exceptions.ServiceException;
import org.onebusaway.federations.FederatedService;
import org.onebusaway.federations.FederatedServiceCollection;
import org.onebusaway.federations.annotations.AgencyIdSupport;
import org.onebusaway.federations.annotations.FederatedServiceMethodInvocationHandler;
import org.onebusaway.transit_data.services.TransitDataService;
/**
* A custom {@link FederatedServiceMethodInvocationHandler} for handling
* federated dispatch of method that accept a single {@link SituationQueryBean}
* as an argument, such as
* {@link TransitDataService#getServiceAlerts(SituationQueryBean)}.
*
* @author bdferris
* @see TransitDataService#getServiceAlerts(SituationQueryBean)
* @see SituationQueryBean
* @see FederatedServiceMethodInvocationHandler
*/
public class SituationQueryBeanFederatedServiceMethodInvocationHandler
implements FederatedServiceMethodInvocationHandler {
@Override
public Object invoke(FederatedServiceCollection collection, Method method,
Object[] args) throws ServiceException, IllegalArgumentException,
IllegalAccessException, InvocationTargetException {
if (args.length == 0) {
throw new ServiceException("unexpected number of arguments");
}
SituationQueryBean query = (SituationQueryBean) args[0];
Set<String> agencyIds = new HashSet<String>();
if (query.getAffects() != null) {
for (SituationQueryBean.AffectsBean affects : query.getAffects()) {
if (affects.getAgencyId() != null) {
agencyIds.add(affects.getAgencyId());
}
addAgencyId(affects.getRouteId(), agencyIds);
addAgencyId(affects.getTripId(), agencyIds);
addAgencyId(affects.getStopId(), agencyIds);
}
}
FederatedService service = collection.getServiceForAgencyIds(agencyIds);
return method.invoke(service, args);
}
private static void addAgencyId(String entityId, Set<String> agencyIds) {
if (entityId == null || entityId.isEmpty()) {
return;
}
agencyIds.add(AgencyIdSupport.getAgencyIdFromEntityId(entityId));
}
}