io.joynr.provider.SubscriptionPublisherFactory Maven / Gradle / Ivy

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package io.joynr.provider;

/*
 * #%L
 * %%
 * Copyright (C) 2016 BMW Car IT GmbH
 * %%
 * 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.
 * #L%
 */

public class SubscriptionPublisherFactory {
    /*
     * Suppressing warnings allows to case a provider to SubscriptionPublisherInjection without template
     * parameter. It is guaranteed by the generated joynr providers that the cast works as expected
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public AbstractSubscriptionPublisher create(final Object provider) {
        String interfaceName = ProviderAnnotations.getInterfaceName(provider);
        String subscriptionPublisherClassName = "joynr." + interfaceName.replace("/", ".")
                + SubscriptionPublisher.class.getSimpleName();
        String subcriptionPublisherImplClassName = subscriptionPublisherClassName + "Impl";
        try {

            Class subscriptionPublisherImplClass = Class.forName(subcriptionPublisherImplClassName);
            AbstractSubscriptionPublisher subscriptionPublisherImpl = (AbstractSubscriptionPublisher) subscriptionPublisherImplClass.newInstance();
            try {
                Class subscriptionPublisherInjectionClass = Class.forName(subscriptionPublisherClassName
                        + "Injection");
                if (subscriptionPublisherInjectionClass.isInstance(provider)) {
                    ((SubscriptionPublisherInjection) provider).setSubscriptionPublisher(subscriptionPublisherImpl);
                }
            } catch (ClassNotFoundException exception) {
                //if subscriptionPublisherInjectionClassname could not be found, we assume that the provider does not require a SubscriptionPublisher
            }

            return subscriptionPublisherImpl;
        } catch (ClassNotFoundException e) {
            throw new IllegalArgumentException("For given provider of joynr interface \"" + interfaceName
                    + "\", expected subscription publisher class of type \"" + subcriptionPublisherImplClassName
                    + "\" could not be found by the classloader." + " Please ensure the class can be loaded.");
        } catch (InstantiationException e) {
            throw new IllegalArgumentException("For given provider of joynr interface \"" + interfaceName
                    + "\", expected subscription publisher class of type \"" + subcriptionPublisherImplClassName
                    + "\" could not be instantiated due to the following error: " + e.getMessage());

        } catch (IllegalAccessException e) {
            throw new IllegalArgumentException("For given provider of joynr interface \"" + interfaceName
                    + "\", expected subscription publisher class of type \"" + subcriptionPublisherImplClassName
                    + "\" could not be accessed due to the following error: " + e.getMessage());
        }
    }
}