Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
EstablishDefaultParameterValuesVisitor |
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| 4.0;4 |
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.pageload; |
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16 | ||
17 | import org.apache.hivemind.ApplicationRuntimeException; |
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18 | import org.apache.tapestry.IBinding; |
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19 | import org.apache.tapestry.IComponent; |
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20 | import org.apache.tapestry.binding.BindingConstants; |
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21 | import org.apache.tapestry.binding.BindingSource; |
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22 | import org.apache.tapestry.spec.IComponentSpecification; |
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23 | import org.apache.tapestry.spec.IParameterSpecification; |
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24 | ||
25 | import java.util.Iterator; |
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26 | ||
27 | /** |
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28 | * For all parameters in the examined component that have default values, but |
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29 | * are not bound, automatically add an ExpressionBinding with the default value. |
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30 | * |
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31 | * @author mindbridge |
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32 | * @since 3.0 |
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33 | */ |
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34 | 0 | public class EstablishDefaultParameterValuesVisitor implements IComponentVisitor |
35 | { |
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36 | ||
37 | /** @since 4.0 */ |
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38 | private BindingSource _bindingSource; |
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39 | ||
40 | /** |
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41 | * @see org.apache.tapestry.pageload.IComponentVisitor#visitComponent(org.apache.tapestry.IComponent) |
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42 | */ |
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43 | public void visitComponent(IComponent component) |
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44 | { |
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45 | 0 | IComponentSpecification spec = component.getSpecification(); |
46 | ||
47 | 0 | Iterator i = spec.getParameterNames().iterator(); |
48 | ||
49 | 0 | while(i.hasNext()) |
50 | { |
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51 | 0 | String name = (String) i.next(); |
52 | 0 | IParameterSpecification parameterSpec = spec.getParameter(name); |
53 | ||
54 | // Skip aliases |
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55 | ||
56 | 0 | if (!name.equals(parameterSpec.getParameterName())) continue; |
57 | ||
58 | 0 | String defaultValue = parameterSpec.getDefaultValue(); |
59 | 0 | if (defaultValue == null) continue; |
60 | ||
61 | // the parameter has a default value, so it must not be required |
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62 | 0 | if (parameterSpec.isRequired()) |
63 | 0 | throw new ApplicationRuntimeException(PageloadMessages |
64 | .parameterMustHaveNoDefaultValue(component, name), |
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65 | component, parameterSpec.getLocation(), null); |
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66 | ||
67 | // if there is no binding for this parameter, bind it to the default |
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68 | // value. |
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69 | // In 3.0, default-value was always an OGNL expression, but now its |
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70 | // a binding reference. |
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71 | ||
72 | 0 | if (component.getBinding(name) == null) |
73 | { |
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74 | 0 | String description = PageloadMessages |
75 | .defaultParameterName(name); |
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76 | ||
77 | 0 | IBinding binding = _bindingSource.createBinding(component, |
78 | description, defaultValue, |
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79 | BindingConstants.OGNL_PREFIX, parameterSpec |
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80 | .getLocation()); |
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81 | ||
82 | 0 | component.setBinding(name, binding); |
83 | } |
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84 | 0 | } |
85 | 0 | } |
86 | ||
87 | /** @since 4.0 */ |
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88 | ||
89 | public void setBindingSource(BindingSource bindingSource) |
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90 | { |
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91 | 0 | _bindingSource = bindingSource; |
92 | 0 | } |
93 | } |