/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.tuscany.sca.binding.event.impl;

import java.util.logging.Logger;

import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.binding.event.DefaultEventBindingFactory;
import org.apache.tuscany.sca.contribution.ModelFactoryExtensionPoint;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.interfacedef.InterfaceContract;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.provider.BindingProviderFactory;
import org.apache.tuscany.sca.provider.PolicyProvider;
import org.apache.tuscany.sca.provider.PolicyProviderFactory;
import org.apache.tuscany.sca.provider.ProviderFactoryExtensionPoint;
import org.apache.tuscany.sca.provider.ReferenceBindingProvider;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentReference;

/** 
 * Event reference binding provider 
 * 
 * @version $$
 */
public class EventReferenceBindingProvider implements ReferenceBindingProvider {

    private static final Logger logger = Logger.getLogger(EventReferenceBindingProvider.class.getName());

	@SuppressWarnings("unused")
    private RuntimeComponent component;
	@SuppressWarnings("unused")
    private EventBindingImpl binding;
    @SuppressWarnings("unused")
    private RuntimeComponentReference reference;
    private boolean started = false;
    private ReferenceBindingProvider baseBindingProvider;



    @SuppressWarnings("unchecked")
    public EventReferenceBindingProvider(ExtensionPointRegistry extensionPoints,
                                              RuntimeComponent component,
                                              RuntimeComponentReference reference,
                                              EventBindingImpl binding) {
        this.component = component;
        this.reference = reference;
        this.binding = binding;
        

        ProviderFactoryExtensionPoint providerFactories = extensionPoints.getExtensionPoint(ProviderFactoryExtensionPoint.class);
        ModelFactoryExtensionPoint modelFactories = extensionPoints.getExtensionPoint(ModelFactoryExtensionPoint.class);
        
        
        Binding baseBinding = binding.getBaseBinding();
        if (baseBinding == null) {

            DefaultEventBindingFactory defaultEventBindingFactory = 
                (DefaultEventBindingFactory)modelFactories.getFactory(DefaultEventBindingFactory.class);
            
            if (defaultEventBindingFactory == null) {
                logger.severe("Default binding for Event binding not available");
            }
            baseBinding = binding.createDefaultBaseBinding(defaultEventBindingFactory);
        }

        BindingProviderFactory providerFactory =
            (BindingProviderFactory)providerFactories.getProviderFactory(baseBinding.getClass());
        if (providerFactory != null) {
            baseBindingProvider =
                providerFactory.createReferenceBindingProvider((RuntimeComponent)component,
                                                               (RuntimeComponentReference)reference,
                                                               baseBinding);
            for (PolicyProviderFactory f : providerFactories.getPolicyProviderFactories()) {
                PolicyProvider policyProvider = f.createReferencePolicyProvider(component, reference, baseBinding);
                if (policyProvider != null) {
                    reference.addPolicyProvider(baseBinding, policyProvider);
                }
            }
        }
        if (baseBindingProvider == null) {
            throw new IllegalStateException("Provider factory not found for class: " + baseBinding.getClass().getName());
        }
        
    }


    public InterfaceContract getBindingInterfaceContract() {
        return baseBindingProvider.getBindingInterfaceContract();
    }

    public boolean supportsOneWayInvocation() {
        return true;
    }


    public Invoker createInvoker(Operation operation) {
        return new EventBindingInvoker(baseBindingProvider, operation);
    }

    public void start() {
        if (started) {
            return;
        } else {
            baseBindingProvider.start();
            started = true;
        }
    }

    public void stop() {
        if (!started) {
            return;
        } else {
            baseBindingProvider.stop();
            started = false;
        }

    }

}