org.soulwing.prospecto.runtime.association.ConcreteAssociationManagerLocator Maven / Gradle / Ivy
/*
* File created on Mar 31, 2016
*
* Copyright (c) 2016 Carl Harris, Jr
* and others as noted
*
* 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.soulwing.prospecto.runtime.association;
import org.soulwing.prospecto.api.ViewApplicatorException;
import org.soulwing.prospecto.api.association.AssociationDescriptor;
import org.soulwing.prospecto.api.association.AssociationManager;
import org.soulwing.prospecto.api.association.Stateful;
import org.soulwing.prospecto.api.template.UpdatableNode;
import org.soulwing.prospecto.runtime.context.ScopedViewContext;
/**
* An {@link AssociationManager} implementation.
*
* @author Carl Harris
*/
class ConcreteAssociationManagerLocator
implements AssociationManagerLocator {
public static ConcreteAssociationManagerLocator INSTANCE =
new ConcreteAssociationManagerLocator();
private ConcreteAssociationManagerLocator() {}
@Override
@SuppressWarnings("unchecked")
public M findManager(
Class managerClass, M defaultManager,
AssociationDescriptor descriptor, UpdatableNode node,
ScopedViewContext context) {
final M manager = doFindManager(managerClass, defaultManager, descriptor,
node, context);
if (manager instanceof Stateful) {
return (M) ((Stateful) manager).clone();
}
return manager;
}
private M doFindManager(Class managerClass,
M defaultManager, AssociationDescriptor descriptor, UpdatableNode node,
ScopedViewContext context) {
AssociationManager manager = node.get(managerClass);
if (manager != null) {
if (!manager.supports(descriptor)) {
throw new ViewApplicatorException(
"association manager does not support association");
}
return (M) manager;
}
manager = context.getAssociationManagers().findManager(managerClass,
descriptor);
if (manager != null) return (M) manager;
return defaultManager;
}
}