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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
AbstractPropertyWorker.java | 100% | 100% | 100% | 100% |
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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.tapestry.enhance; | |
16 | ||
17 | import java.util.Iterator; | |
18 | ||
19 | import org.apache.hivemind.ErrorLog; | |
20 | import org.apache.tapestry.IComponent; | |
21 | import org.apache.tapestry.event.PageDetachListener; | |
22 | import org.apache.tapestry.spec.IComponentSpecification; | |
23 | ||
24 | /** | |
25 | * No, this class isn't abstract ... this worker locates abstract properties in the base component | |
26 | * class and provides a concrete implementation for them in the enhanced class. | |
27 | * | |
28 | * @author Howard M. Lewis Ship | |
29 | * @since 4.0 | |
30 | */ | |
31 | public class AbstractPropertyWorker implements EnhancementWorker | |
32 | { | |
33 | private ErrorLog _errorLog; | |
34 | ||
35 | 551 | public void performEnhancement(EnhancementOperation op, IComponentSpecification spec) |
36 | { | |
37 | 551 | Iterator i = op.findUnclaimedAbstractProperties().iterator(); |
38 | ||
39 | 551 | while (i.hasNext()) |
40 | { | |
41 | 1081 | String name = (String) i.next(); |
42 | ||
43 | 1081 | try |
44 | { | |
45 | 1081 | createProperty(op, name); |
46 | } | |
47 | catch (Exception ex) | |
48 | { | |
49 | 1 | _errorLog.error( |
50 | EnhanceMessages.errorAddingProperty(name, op.getBaseClass(), ex), | |
51 | spec.getLocation(), | |
52 | ex); | |
53 | } | |
54 | } | |
55 | } | |
56 | ||
57 | 1081 | private void createProperty(EnhancementOperation op, String name) |
58 | { | |
59 | // This won't be null because its always for existing properties. | |
60 | ||
61 | 1081 | Class propertyType = op.getPropertyType(name); |
62 | ||
63 | 1080 | String fieldName = "_$" + name; |
64 | 1080 | String defaultFieldName = fieldName + "$defaultValue"; |
65 | ||
66 | 1080 | op.addField(fieldName, propertyType); |
67 | 1080 | op.addField(defaultFieldName, propertyType); |
68 | ||
69 | 1080 | EnhanceUtils.createSimpleAccessor(op, fieldName, name, propertyType); |
70 | 1080 | EnhanceUtils.createSimpleMutator(op, fieldName, name, propertyType); |
71 | ||
72 | // Copy the real attribute into the default attribute inside finish load | |
73 | // (allowing a default value to be set inside finishLoad()). | |
74 | ||
75 | 1080 | op.extendMethodImplementation( |
76 | IComponent.class, | |
77 | EnhanceUtils.FINISH_LOAD_SIGNATURE, | |
78 | defaultFieldName + " = " + fieldName + ";"); | |
79 | ||
80 | // On page detach, restore the attribute to its default value. | |
81 | ||
82 | 1080 | op.extendMethodImplementation( |
83 | PageDetachListener.class, | |
84 | EnhanceUtils.PAGE_DETACHED_SIGNATURE, | |
85 | fieldName + " = " + defaultFieldName + ";"); | |
86 | ||
87 | // This is not all that necessary, but is proper. | |
88 | ||
89 | 1080 | op.claimProperty(name); |
90 | } | |
91 | ||
92 | 42 | public void setErrorLog(ErrorLog errorLog) |
93 | { | |
94 | 42 | _errorLog = errorLog; |
95 | } | |
96 | } |
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