01: // Copyright 2004, 2005 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // 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: * Returns null if the input is null or empty. Returns the service with the given name
30: * otherwise. Will log an error and return null if an exception is thrown. If the input value is
31: * not qualified, the contributing module's id is added as a prefix.
32: */
33: public Object translate(Module contributingModule,
34: Class propertyType, String inputValue, Location location) {
35: if (HiveMind.isBlank(inputValue))
36: return null;
37:
38: return contributingModule.getService(inputValue, Object.class);
39: }
40:
41: }
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