001 // Copyright 2007 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.commons.logging.Log; 018 import org.apache.commons.logging.LogFactory; 019 import org.apache.hivemind.internal.RegistryInfrastructure; 020 import org.apache.hivemind.service.AutowiringStrategy; 021 import org.apache.hivemind.util.PropertyUtils; 022 023 /** 024 * Implementation of {@link AutowiringStrategy} that searches for 025 * a matching service by the type of a property. 026 * 027 * @author Achim Huegen 028 */ 029 public class AutowiringByTypeStrategy implements AutowiringStrategy 030 { 031 private static final Log LOG = LogFactory.getLog(AutowiringByTypeStrategy.class); 032 033 public boolean autowireProperty(RegistryInfrastructure registry, Object target, String propertyName) 034 { 035 Class propertyType = PropertyUtils.getPropertyType(target, propertyName); 036 037 // search for a property with an interface that matches the property type 038 if (registry.containsService(propertyType, null)) 039 { 040 Object collaboratingService = registry.getService(propertyType, null); 041 PropertyUtils.write(target, propertyName, collaboratingService); 042 043 if (LOG.isDebugEnabled()) 044 { 045 LOG.debug("Autowired property " + propertyName + " by type to " + collaboratingService); 046 } 047 return true; 048 } else { 049 return false; 050 } 051 } 052 053 }