001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.hivemind.service.impl;
016    
017    import org.apache.hivemind.HiveMind;
018    import org.apache.hivemind.Location;
019    import org.apache.hivemind.internal.Module;
020    import org.apache.hivemind.service.ObjectProvider;
021    
022    /**
023     * An {@link org.apache.hivemind.service.ObjectProvider} that provides access to services. Returns
024     * null if the input is null. Deployed with the prefix "service".
025     * 
026     * @author Howard Lewis Ship
027     */
028    public class ServiceObjectProvider implements ObjectProvider
029    {
030        /**
031         * Interprets the locator as a service id, and passes it to
032         * {@link Module#getService(String, Class)}.
033         */
034        public Object provideObject(Module contributingModule, Class propertyType, String locator,
035                Location location)
036        {
037            if (HiveMind.isBlank(locator))
038                return null;
039    
040            return contributingModule.getService(locator, Object.class);
041        }
042    
043    }