Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
ExtensionLookupFactory |
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1 | // Copyright 2004, 2005 The Apache Software Foundation |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | ||
15 | package org.apache.tapestry.services.impl; |
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16 | ||
17 | import org.apache.hivemind.ApplicationRuntimeException; |
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18 | import org.apache.hivemind.ServiceImplementationFactory; |
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19 | import org.apache.hivemind.ServiceImplementationFactoryParameters; |
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20 | import org.apache.hivemind.lib.DefaultImplementationBuilder; |
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21 | import org.apache.tapestry.spec.IApplicationSpecification; |
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22 | ||
23 | /** |
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24 | * An implementation of {@link org.apache.hivemind.ServiceImplementationFactory}that looks for a |
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25 | * service implementation provided as an |
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26 | * {@link org.apache.tapestry.spec.ILibrarySpecification#getExtension(String) application |
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27 | * extension}. If no such extension exists, then a |
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28 | * {@link org.apache.hivemind.lib.DefaultImplementationBuilder default implementation}is |
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29 | * constructed and returned instead. This allows compatibility with Tapestry 3.0 and earlier |
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30 | * application extensions (though those will be phased out in the future). |
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31 | * |
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32 | * @author Howard Lewis Ship |
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33 | * @since 4.0 |
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34 | */ |
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35 | 4 | public class ExtensionLookupFactory implements ServiceImplementationFactory |
36 | { |
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37 | private IApplicationSpecification _specification; |
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38 | ||
39 | private DefaultImplementationBuilder _defaultBuilder; |
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40 | ||
41 | public Object createCoreServiceImplementation( |
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42 | ServiceImplementationFactoryParameters factorParameters) |
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43 | { |
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44 | 4 | ExtensionLookupParameter p = (ExtensionLookupParameter) factorParameters.getParameters() |
45 | .get(0); |
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46 | ||
47 | 4 | String extensionName = p.getExtensionName(); |
48 | ||
49 | 4 | Class serviceInterface = factorParameters.getServiceInterface(); |
50 | ||
51 | try |
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52 | { |
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53 | 4 | if (_specification.checkExtension(extensionName)) |
54 | 1 | return _specification.getExtension(extensionName, serviceInterface); |
55 | ||
56 | 2 | if (p.getDefault() != null) |
57 | 1 | return p.getDefault(); |
58 | ||
59 | 1 | return _defaultBuilder.buildDefaultImplementation(serviceInterface); |
60 | } |
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61 | 1 | catch (Exception ex) |
62 | { |
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63 | 1 | throw new ApplicationRuntimeException(ex.getMessage(), p.getLocation(), ex); |
64 | } |
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65 | } |
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66 | ||
67 | public void setDefaultBuilder(DefaultImplementationBuilder builder) |
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68 | { |
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69 | 1 | _defaultBuilder = builder; |
70 | 1 | } |
71 | ||
72 | public void setSpecification(IApplicationSpecification specification) |
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73 | { |
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74 | 3 | _specification = specification; |
75 | 3 | } |
76 | ||
77 | } |