ServiceTranslator


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 org.apache.hivemind.HiveMind;
18  import org.apache.hivemind.Location;
19  import org.apache.hivemind.internal.Module;
20  import org.apache.hivemind.schema.Translator;
21  
22  /**
23   * Used to translate a value into a reference to a HiveMind service within the registry.
24   * 
25   * @author Howard Lewis Ship
26   */
27  public class ServiceTranslator implements Translator
28  {
29      /**
30       * Returns null if the input is null or empty. Returns the service with the given name
31       * otherwise. Will log an error and return null if an exception is thrown. If the input value is
32       * not qualified, the contributing module's id is added as a prefix.
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          return contributingModule.getService(inputValue, Object  .class);
41      }
42  
43  }

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