Source code: org/apache/hivemind/schema/rules/ServiceTranslator.java
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 }