/**
*
* Copyright 2009-2011 Rickard Öberg AB
*
* 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.rest.server.api.constraint;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import org.qi4j.api.injection.scope.Structure;
import org.qi4j.api.service.ServiceReference;
import org.qi4j.api.structure.Module;
import org.qi4j.library.rest.server.api.ObjectSelection;
/**
* Annotate interaction methods with ServiceAvailable. They will only be valid
* if a service with the given type is available.
*/
@InteractionConstraintDeclaration( ServiceAvailable.ServiceAvailableConstraint.class )
@Retention( RetentionPolicy.RUNTIME )
public @interface ServiceAvailable
{
Class value();
public class ServiceAvailableConstraint
implements InteractionConstraint<ServiceAvailable>
{
@Structure
Module module;
@Override
public boolean isValid( ServiceAvailable serviceAvailable, ObjectSelection objectSelection )
{
ServiceReference ref = module.findService( serviceAvailable.value() );
return ref != null && ref.isAvailable();
}
}
}