Source code: org/apache/hivemind/schema/rules/SmartTranslator.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 java.beans.PropertyEditor;
18 import java.beans.PropertyEditorManager;
19 import java.util.Map;
20
21 import org.apache.hivemind.ApplicationRuntimeException;
22 import org.apache.hivemind.Location;
23 import org.apache.hivemind.internal.Module;
24 import org.apache.hivemind.schema.Translator;
25
26 /**
27 * A "smart" translator that attempts to automatically convert from string types to object or
28 * wrapper types, using {@link java.beans.PropertyEditor}s.
29 *
30 * @author Howard Lewis Ship
31 */
32 public class SmartTranslator implements Translator
33 {
34 private String _default;
35
36 public SmartTranslator()
37 {
38 }
39
40 /**
41 * Initializers:
42 * <ul>
43 * <li>default: default value for empty input
44 * </ul>
45 */
46 public SmartTranslator(String initializer)
47 {
48 Map m = RuleUtils.convertInitializer(initializer);
49
50 _default = (String) m.get("default");
51 }
52
53 public Object translate(Module contributingModule, Class propertyType, String inputValue,
54 Location location)
55 {
56 // HIVEMIND-10: Inside JavaWebStart you (strangely) can't rely on
57 // a PropertyEditor for String (even though it is trivial).
58
59 if (inputValue == null)
60 {
61 if (_default == null)
62 return null;
63
64 inputValue = _default;
65 }
66
67 if (propertyType.equals(String.class) || propertyType.equals(Object.class))
68 return inputValue;
69
70 // TODO: This duplicates logic inside PropertyAdaptor.
71
72 try
73 {
74 PropertyEditor e = PropertyEditorManager.findEditor(propertyType);
75
76 if (e == null)
77 throw new ApplicationRuntimeException(RulesMessages.noPropertyEditor(propertyType),
78 location, null);
79
80 e.setAsText(inputValue);
81
82 return e.getValue();
83 }
84 catch (Exception ex)
85 {
86 throw new ApplicationRuntimeException(RulesMessages.smartTranslatorError(
87 inputValue,
88 propertyType,
89 ex), location, ex);
90
91 }
92 }
93
94 }