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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
ExtensionLookupFactory.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 org.apache.hivemind.ApplicationRuntimeException; | |
18 | import org.apache.hivemind.ServiceImplementationFactory; | |
19 | import org.apache.hivemind.ServiceImplementationFactoryParameters; | |
20 | import org.apache.hivemind.lib.DefaultImplementationBuilder; | |
21 | import org.apache.tapestry.spec.IApplicationSpecification; | |
22 | ||
23 | /** | |
24 | * An implementation of {@link org.apache.hivemind.ServiceImplementationFactory}that looks for a | |
25 | * service implementation provided as an | |
26 | * {@link org.apache.tapestry.spec.ILibrarySpecification#getExtension(String) application | |
27 | * extension}. If no such extension exists, then a | |
28 | * {@link org.apache.hivemind.lib.DefaultImplementationBuilder default implementation}is | |
29 | * constructed and returned instead. This allows compatibility with Tapestry 3.0 and earlier | |
30 | * application extensions (though those will be phased out in the future). | |
31 | * | |
32 | * @author Howard Lewis Ship | |
33 | * @since 4.0 | |
34 | */ | |
35 | public class ExtensionLookupFactory implements ServiceImplementationFactory | |
36 | { | |
37 | private IApplicationSpecification _specification; | |
38 | ||
39 | private DefaultImplementationBuilder _defaultBuilder; | |
40 | ||
41 | 87 | public Object createCoreServiceImplementation( |
42 | ServiceImplementationFactoryParameters factorParameters) | |
43 | { | |
44 | 87 | ExtensionLookupParameter p = (ExtensionLookupParameter) factorParameters.getParameters() |
45 | .get(0); | |
46 | ||
47 | 87 | String extensionName = p.getExtensionName(); |
48 | ||
49 | 87 | Class serviceInterface = factorParameters.getServiceInterface(); |
50 | ||
51 | 87 | try |
52 | { | |
53 | 87 | if (_specification.checkExtension(extensionName)) |
54 | 1 | return _specification.getExtension(extensionName, serviceInterface); |
55 | ||
56 | 85 | if (p.getDefault() != null) |
57 | 42 | return p.getDefault(); |
58 | ||
59 | 43 | return _defaultBuilder.buildDefaultImplementation(serviceInterface); |
60 | } | |
61 | catch (Exception ex) | |
62 | { | |
63 | 1 | throw new ApplicationRuntimeException(ex.getMessage(), p.getLocation(), ex); |
64 | } | |
65 | } | |
66 | ||
67 | 42 | public void setDefaultBuilder(DefaultImplementationBuilder builder) |
68 | { | |
69 | 42 | _defaultBuilder = builder; |
70 | } | |
71 | ||
72 | 44 | public void setSpecification(IApplicationSpecification specification) |
73 | { | |
74 | 44 | _specification = specification; |
75 | } | |
76 | ||
77 | } |
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