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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.bean; |
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16 | ||
17 | import org.apache.tapestry.IBinding; |
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18 | ||
19 | /** |
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20 | * A helper bean to assist with providing defaults for unspecified |
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21 | * parameters. It is initalized |
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22 | * with an {@link IBinding} and a default value. It's value property |
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23 | * is either the value of the binding, but if the binding is null, |
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24 | * or the binding returns null, the default value is returned. |
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25 | * |
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26 | * @author Howard Lewis Ship |
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27 | * @since 1.0.5 |
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28 | * |
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29 | **/ |
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30 | ||
31 | 0 | public class Default |
32 | { |
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33 | private IBinding binding; |
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34 | private Object defaultValue; |
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35 | ||
36 | public void resetForPool() |
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37 | { |
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38 | 0 | binding = null; |
39 | 0 | defaultValue = null; |
40 | 0 | } |
41 | ||
42 | public void setBinding(IBinding value) |
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43 | { |
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44 | 0 | binding = value; |
45 | 0 | } |
46 | ||
47 | public IBinding getBinding() |
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48 | { |
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49 | 0 | return binding; |
50 | } |
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51 | ||
52 | public void setDefaultValue(Object value) |
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53 | { |
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54 | 0 | defaultValue = value; |
55 | 0 | } |
56 | ||
57 | public Object getDefaultValue() |
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58 | { |
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59 | 0 | return defaultValue; |
60 | } |
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61 | ||
62 | /** |
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63 | * Returns the value of the binding. However, if the binding is null, or the binding |
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64 | * returns null, then the defaultValue is returned instead. |
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65 | * |
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66 | **/ |
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67 | ||
68 | public Object getValue() |
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69 | { |
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70 | 0 | if (binding == null) |
71 | 0 | return defaultValue; |
72 | ||
73 | 0 | Object value = binding.getObject(); |
74 | ||
75 | 0 | if (value == null) |
76 | 0 | return defaultValue; |
77 | ||
78 | 0 | return value; |
79 | } |
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80 | ||
81 | /** @since 3.0 **/ |
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82 | ||
83 | public void discardFromPool() |
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84 | { |
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85 | 0 | } |
86 | ||
87 | } |