AutowiringByTypeStrategy


1   // Copyright 2007 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.hivemind.service.impl;
16  
17  import org.apache.commons.logging.Log;
18  import org.apache.commons.logging.LogFactory;
19  import org.apache.hivemind.internal.RegistryInfrastructure;
20  import org.apache.hivemind.service.AutowiringStrategy;
21  import org.apache.hivemind.util.PropertyUtils;
22  
23  /**
24   * Implementation of {@link AutowiringStrategy} that searches for
25   * a matching service by the type of a property. 
26   * 
27   * @author Achim Huegen
28   */
29  public class AutowiringByTypeStrategy implements AutowiringStrategy
30  {
31      private static final Log LOG = LogFactory.getLog(AutowiringByTypeStrategy.class);
32  
33      public boolean autowireProperty(RegistryInfrastructure registry, Object   target, String   propertyName)
34      {
35          Class   propertyType = PropertyUtils.getPropertyType(target, propertyName);
36  
37          // search for a property with an interface that matches the property type
38          if (registry.containsService(propertyType, null))
39          {
40              Object   collaboratingService = registry.getService(propertyType, null);
41              PropertyUtils.write(target, propertyName, collaboratingService);
42  
43              if (LOG.isDebugEnabled())
44              {
45                  LOG.debug("Autowired property " + propertyName + " by type to " + collaboratingService);
46              }
47              return true;
48          } else {
49              return false;
50          }
51      }
52  
53  }
54
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