ConfigurationTranslator


1   // Copyright 2004, 2005 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.schema.rules;
16  
17  import java.util.ArrayList  ;
18  import java.util.List  ;
19  import java.util.Map  ;
20  
21  import org.apache.hivemind.HiveMind;
22  import org.apache.hivemind.Location;
23  import org.apache.hivemind.internal.Module;
24  import org.apache.hivemind.schema.Translator;
25  
26  /**
27   * Interprets a string as an extension point id, and provides the elements for that extension point.
28   * Depending on the target property type the elements will be provided as a List or as a Map.
29   * 
30   * @author Howard Lewis Ship
31   */
32  public class ConfigurationTranslator implements Translator
33  {
34      public Object   translate(Module contributingModule, Class   propertyType, String   inputValue,
35              Location location)
36      {
37          if (HiveMind.isBlank(inputValue))
38              return null;
39  
40          // For backward compatibility allow configuratin of type map be assigned to
41          // properties of type List. Drawback: Lazy construction of the configuration
42          // gets lost. The configuration is constructed right here during the conversion
43          Object   configuration = contributingModule.getConfiguration(inputValue);
44          if (configuration instanceof Map   && propertyType.equals(List  .class)) {
45              configuration = new ArrayList  (((Map  ) configuration).values());
46          }
47          
48          return configuration;
49      }
50  }
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