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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * 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.
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 */
package org.fabric3.introspection.java.annotation;

import java.lang.annotation.Annotation;

import org.oasisopen.sca.annotation.Constructor;
import org.oasisopen.sca.annotation.Reference;
import org.oasisopen.sca.annotation.Service;

import org.fabric3.api.model.type.component.ServiceDefinition;
import org.fabric3.api.model.type.contract.ServiceContract;
import org.fabric3.spi.introspection.IntrospectionContext;
import org.fabric3.spi.introspection.java.annotation.AbstractAnnotationProcessor;
import org.fabric3.spi.introspection.java.annotation.PolicyAnnotationProcessor;
import org.fabric3.spi.introspection.java.contract.JavaContractProcessor;
import org.fabric3.spi.introspection.java.policy.OperationPolicyIntrospector;
import org.fabric3.api.model.type.java.InjectingComponentType;

/**
 * Processes the @Service annotation on a component implementation class.
 */
public class OASISServiceProcessor extends AbstractAnnotationProcessor {
    private final JavaContractProcessor contractProcessor;
    private PolicyAnnotationProcessor policyProcessor;
    private OperationPolicyIntrospector policyIntrospector;

    public OASISServiceProcessor(JavaContractProcessor contractProcessor) {
        super(Service.class);
        this.contractProcessor = contractProcessor;
    }

    @Constructor
    public OASISServiceProcessor(@Reference JavaContractProcessor contractProcessor, @Reference OperationPolicyIntrospector policyIntrospector) {
        super(Service.class);
        this.contractProcessor = contractProcessor;
        this.policyIntrospector = policyIntrospector;
    }

    @Reference
    public void setPolicyProcessor(PolicyAnnotationProcessor processor) {
        this.policyProcessor = processor;
    }

    public void visitType(Service annotation, Class type, InjectingComponentType componentType, IntrospectionContext context) {
        Class[] services = annotation.value();
        String[] names = annotation.names();
        for (int i=0; i service = services[i];
            componentType.add(createDefinition(service, names.length == 0 ? service.getSimpleName() : names[i], type, componentType, context));
        }
    }

    @SuppressWarnings({"unchecked"})
    private ServiceDefinition createDefinition(Class service,
                                               String name,
                                               Class implClass,
                                               InjectingComponentType componentType,
                                               IntrospectionContext context) {
        ServiceContract serviceContract = contractProcessor.introspect(service, implClass, context, componentType);
        ServiceDefinition definition = new ServiceDefinition(name, serviceContract);
        Annotation[] annotations = service.getAnnotations();
        if (policyProcessor != null) {
            for (Annotation annotation : annotations) {
                policyProcessor.process(annotation, definition, context);
            }
            policyIntrospector.introspectPolicyOnOperations(serviceContract, implClass, context);
        }
        return definition;
    }
}