/**
* Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
* 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.federations.annotations;
import org.onebusaway.collections.PropertyPathExpression;
import org.onebusaway.exceptions.ServiceException;
import org.onebusaway.federations.FederatedService;
import org.onebusaway.federations.FederatedServiceCollection;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Provides a {@link FederatedServiceMethodInvocationHandler} implementation for
* the {@link FederatedByEntityIdsMethod} annotation.
*
* @author bdferris
*/
class FederatedByAnyEntityIdMethodInvocationHandlerImpl implements
FederatedServiceMethodInvocationHandler {
private final int _argumentIndex;
private final List<PropertyPathExpression> _expressions;
private final List<PropertyPathExpression> _agencyIdExpressions;
public FederatedByAnyEntityIdMethodInvocationHandlerImpl(Method method,
int argumentIndex, String[] properties, String[] agencyIdProperties) {
if (properties.length == 0 && agencyIdProperties.length == 0) {
throw new IllegalArgumentException(
"you must specify at least one property expression");
}
_argumentIndex = argumentIndex;
_expressions = compileExpressions(method, argumentIndex, properties);
_agencyIdExpressions = compileExpressions(method, argumentIndex,
agencyIdProperties);
}
public int getArgumentIndex() {
return _argumentIndex;
}
public Object invoke(FederatedServiceCollection collection, Method method,
Object[] args) throws ServiceException, IllegalArgumentException,
IllegalAccessException, InvocationTargetException {
Object target = args[_argumentIndex];
Set<String> agencyIds = new HashSet<String>();
for (PropertyPathExpression expression : _expressions) {
String entityId = (String) expression.invoke(target);
if (entityId != null)
agencyIds.add(AgencyIdSupport.getAgencyIdFromEntityId(entityId));
}
for (PropertyPathExpression expression : _agencyIdExpressions) {
String agencyId = (String) expression.invoke(target);
if (agencyId != null) {
agencyIds.add(agencyId);
}
}
FederatedService service = collection.getServiceForAgencyIds(agencyIds);
return method.invoke(service, args);
}
private List<PropertyPathExpression> compileExpressions(Method method,
int argumentIndex, String[] properties) {
List<PropertyPathExpression> expressions = new ArrayList<PropertyPathExpression>(
properties.length);
for (String property : properties) {
PropertyPathExpression expression = new PropertyPathExpression(property);
Class<?>[] parameterTypes = method.getParameterTypes();
expression.initialize(parameterTypes[argumentIndex]);
expressions.add(expression);
}
return expressions;
}
}