| /** |
| * |
| * 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(); |
| } |
| } |
| } |