Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||
PropertyChangeObserver |
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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 | package org.apache.tapestry.record; |
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15 | ||
16 | import org.apache.tapestry.IComponent; |
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17 | import org.apache.tapestry.Tapestry; |
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18 | ||
19 | ||
20 | /** |
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21 | * Core service that is consulted anytime a specified component property is set. This service |
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22 | * is intended to be used as a means of intercepting component property state objects so that |
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23 | * their individual properties can be observed independently from basic set/get operations |
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24 | * done on page/component properties. |
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25 | * |
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26 | */ |
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27 | public interface PropertyChangeObserver |
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28 | { |
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29 | ||
30 | /** |
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31 | * Invoked by the enhanced property workers any time a {@link IComponent} property is set, either |
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32 | * by an initial value binding or explicitly through an abstract setter. |
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33 | * |
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34 | * @param component |
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35 | * The component that this property is attached to. |
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36 | * @param property |
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37 | * The object to observe changes on, may be null. |
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38 | * @param propertyName |
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39 | * The name of the property being observed - needed for doing things like calling |
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40 | * {@link Tapestry#fireObservedChange(IComponent, String, Object)}. |
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41 | * @return Expected to return either the same exact instance passed in or one that is proxied but still |
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42 | * maintains the original state of the object. |
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43 | */ |
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44 | Object observePropertyChanges(IComponent component, Object property, String propertyName); |
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45 | } |