/* Copyright 2008 Edward Yakop.
*
* 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.qi4j.library.spring.bootstrap.internal.service;
import org.qi4j.api.object.ObjectDescriptor;
import org.qi4j.api.service.ImportedServiceDescriptor;
import org.qi4j.api.service.ServiceDescriptor;
import org.qi4j.api.service.ServiceReference;
import org.qi4j.api.structure.Application;
import org.qi4j.api.structure.ApplicationDescriptor;
import org.qi4j.api.structure.LayerDescriptor;
import org.qi4j.api.structure.Module;
import org.qi4j.api.structure.ModuleDescriptor;
import org.qi4j.functional.HierarchicalVisitor;
import static org.qi4j.functional.Iterables.first;
final class ServiceLocator
implements HierarchicalVisitor<Object, Object, RuntimeException>
{
private final String serviceId;
private Class serviceType;
private String moduleName;
private String layerName;
private String tempLayerName;
private String tempModuleName;
ServiceLocator( String serviceId )
{
this.serviceId = serviceId;
}
@Override
public boolean visitEnter( Object visited )
throws RuntimeException
{
if( visited instanceof ApplicationDescriptor )
{
return true;
}
else if( visited instanceof LayerDescriptor )
{
tempLayerName = ( (LayerDescriptor) visited ).name();
return true;
}
else if( visited instanceof ModuleDescriptor )
{
tempModuleName = ( (ModuleDescriptor) visited ).name();
return true;
}
else if( visited instanceof ServiceDescriptor )
{
ServiceDescriptor aDescriptor = (ServiceDescriptor) visited;
String identity = aDescriptor.identity();
if( serviceId.equals( identity ) )
{
layerName = tempLayerName;
moduleName = tempModuleName;
serviceType = first( aDescriptor.types() );
}
}
else if( visited instanceof ObjectDescriptor )
{
return false;
}
return true;
}
@Override
public boolean visitLeave( Object visited )
throws RuntimeException
{
return true;
}
@Override
public boolean visit( Object visited )
throws RuntimeException
{
if( visited instanceof ImportedServiceDescriptor )
{
ImportedServiceDescriptor aDescriptor = (ImportedServiceDescriptor) visited;
String identity = aDescriptor.identity();
if( serviceId.equals( identity ) )
{
layerName = tempLayerName;
moduleName = tempModuleName;
serviceType = aDescriptor.type();
}
}
return true;
}
@SuppressWarnings( "unchecked" )
ServiceReference locateService( Application anApplication )
{
if( layerName != null )
{
Module module = anApplication.findModule( layerName, moduleName );
Iterable<ServiceReference<Object>> serviceRefs = module.findServices( serviceType );
for( ServiceReference<Object> serviceRef : serviceRefs )
{
if( serviceId.equals( serviceRef.identity() ) )
{
return serviceRef;
}
}
}
return null;
}
}