Classes in this File | Line Coverage | Branch Coverage | Complexity | |||||||
ObservedChangeEvent |
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| 1.0;1 |
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.event; |
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16 | ||
17 | import java.util.EventObject; |
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18 | ||
19 | import org.apache.hivemind.util.Defense; |
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20 | import org.apache.tapestry.IComponent; |
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21 | ||
22 | /** |
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23 | * Event which describes a change to a particular {@link IComponent}. |
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24 | * |
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25 | * @author Howard Ship |
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26 | */ |
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27 | ||
28 | public class ObservedChangeEvent extends EventObject |
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29 | { |
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30 | ||
31 | private static final long serialVersionUID = -7693394232554811975L; |
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32 | ||
33 | private IComponent _component; |
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34 | ||
35 | private String _propertyName; |
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36 | ||
37 | private Object _newValue; |
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38 | ||
39 | /** |
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40 | * Creates the event. The new value must be null, or be a serializable |
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41 | * object. (It is declared as Object as a concession to the Java 2 |
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42 | * collections framework, where the implementations are serializable but the |
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43 | * interfaces (Map, List, etc.) don't extend Serializable ... so we wait |
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44 | * until runtime to check). |
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45 | * |
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46 | * @param component |
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47 | * The component (not necessarily a page) whose property changed. |
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48 | * @param propertyName |
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49 | * the name of the property which was changed. |
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50 | * @param newValue |
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51 | * The new value of the property. |
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52 | * @throws IllegalArgumentException |
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53 | * if propertyName is null, or if the new value is not |
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54 | * serializable |
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55 | */ |
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56 | ||
57 | public ObservedChangeEvent(IComponent component, String propertyName, Object newValue) |
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58 | { |
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59 | 3 | super(component); |
60 | ||
61 | 3 | Defense.notNull(propertyName, "propertyName"); |
62 | ||
63 | 3 | _component = component; |
64 | 3 | _propertyName = propertyName; |
65 | 3 | _newValue = newValue; |
66 | 3 | } |
67 | ||
68 | public IComponent getComponent() |
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69 | { |
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70 | 3 | return _component; |
71 | } |
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72 | ||
73 | public Object getNewValue() |
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74 | { |
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75 | 1 | return _newValue; |
76 | } |
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77 | ||
78 | public String getPropertyName() |
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79 | { |
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80 | 3 | return _propertyName; |
81 | } |
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82 | ||
83 | } |