src/main/java/org/apache/sling/junit/rules/ServiceGetter.java

/*
 * 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.sling.junit.rules;

import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;

/** Implements the logic used to get a service */
class ServiceGetter {
    final ServiceReference serviceReference;
    final Object service;

    ServiceGetter(BundleContext bundleContext, Class<?> serviceClass, String ldapFilter) {
        Object s;
        
        if(ldapFilter != null && !ldapFilter.isEmpty()) {
            throw new UnsupportedOperationException("LDAP service filter is not supported so far");
        }
        
        if (serviceClass.equals(BundleContext.class)) {
            // Special case to provide the BundleContext to tests
            s = serviceClass.cast(bundleContext);
            serviceReference = null;
        } else {
            serviceReference = bundleContext.getServiceReference(serviceClass
                    .getName());

            if (serviceReference == null) {
                throw new IllegalStateException(
                        "unable to get a service reference");
            }

            final Object service = bundleContext.getService(serviceReference);

            if (service == null) {
                throw new IllegalStateException(
                        "unable to get an instance of the service");
            }

            s = serviceClass.cast(service);
        }
        
        service = s;
    }
}