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30 day Evaluation License registered to hlship@comcast.net Your 30 day evaluation period has expired. Please visit http://www.cenqua.com to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
EngineFactoryImpl.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.services.impl; | |
16 | ||
17 | import java.util.Locale; | |
18 | ||
19 | import org.apache.hivemind.ApplicationRuntimeException; | |
20 | import org.apache.hivemind.ClassResolver; | |
21 | import org.apache.tapestry.IEngine; | |
22 | import org.apache.tapestry.services.EngineFactory; | |
23 | import org.apache.tapestry.spec.IApplicationSpecification; | |
24 | ||
25 | /** | |
26 | * Standard implementation of {@link org.apache.tapestry.services.EngineFactory} service. | |
27 | * This should do for most purposes, since a major focus of Tapestry 4.0 is to no longer | |
28 | * require subclassing of {@link org.apache.tapestry.engine.BaseEngine}. | |
29 | * | |
30 | * @author Howard Lewis Ship | |
31 | * @since 4.0 | |
32 | */ | |
33 | public class EngineFactoryImpl implements EngineFactory | |
34 | { | |
35 | private IApplicationSpecification _applicationSpecification; | |
36 | private String _defaultEngineClassName; | |
37 | private EngineConstructor _constructor; | |
38 | private ClassResolver _classResolver; | |
39 | ||
40 | interface EngineConstructor | |
41 | { | |
42 | IEngine construct(); | |
43 | } | |
44 | ||
45 | ||
46 | // TODO: Create a BaseEngineConstructor that is hardcoded to | |
47 | // instantiate a BaseEngine instance, without using reflection | |
48 | // (for efficiency). | |
49 | ||
50 | static class ReflectiveEngineConstructor implements EngineConstructor | |
51 | { | |
52 | private Class _engineClass; | |
53 | ||
54 | 44 | ReflectiveEngineConstructor(Class engineClass) |
55 | { | |
56 | 44 | _engineClass = engineClass; |
57 | } | |
58 | ||
59 | 52 | public IEngine construct() |
60 | { | |
61 | 52 | try |
62 | { | |
63 | 52 | return (IEngine) _engineClass.newInstance(); |
64 | } | |
65 | catch (Exception ex) | |
66 | { | |
67 | 1 | throw new ApplicationRuntimeException( |
68 | ImplMessages.errorInstantiatingEngine(_engineClass, ex), | |
69 | ex); | |
70 | } | |
71 | } | |
72 | } | |
73 | ||
74 | 45 | public void initializeService() |
75 | { | |
76 | 45 | String engineClassName = _applicationSpecification.getEngineClassName(); |
77 | ||
78 | // TODO: Check in web.xml first. | |
79 | ||
80 | 45 | if (engineClassName == null) |
81 | 37 | engineClassName = _defaultEngineClassName; |
82 | ||
83 | 45 | Class engineClass = _classResolver.findClass(engineClassName); |
84 | ||
85 | 44 | _constructor = new ReflectiveEngineConstructor(engineClass); |
86 | } | |
87 | ||
88 | 52 | public IEngine constructNewEngineInstance(Locale locale) |
89 | { | |
90 | 52 | IEngine result = _constructor.construct(); |
91 | ||
92 | 51 | result.setLocale(locale); |
93 | ||
94 | 51 | return result; |
95 | } | |
96 | ||
97 | 45 | public void setApplicationSpecification(IApplicationSpecification specification) |
98 | { | |
99 | 45 | _applicationSpecification = specification; |
100 | } | |
101 | ||
102 | 45 | public void setClassResolver(ClassResolver resolver) |
103 | { | |
104 | 45 | _classResolver = resolver; |
105 | } | |
106 | ||
107 | 42 | public void setDefaultEngineClassName(String string) |
108 | { | |
109 | 42 | _defaultEngineClassName = string; |
110 | } | |
111 | ||
112 | } |
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