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org.apache.commons.jelly.MapTagSupport |
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1 | /* |
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2 | * Copyright 2002,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | ||
17 | package org.apache.commons.jelly; |
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18 | ||
19 | import java.util.HashMap; |
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20 | ||
21 | import java.util.Map; |
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22 | ||
23 | /** |
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24 | * <p><code>MapTag</code> is a DynaTag implementation which uses a Map |
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25 | * to store its attribute values in. Derived tags can then process this |
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26 | * Map, change values, add or remove attributes or perform some other form |
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27 | * of processsing pretty easily. |
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28 | * </p> |
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29 | * |
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30 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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31 | * @version $Revision: 1.8 $ |
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32 | */ |
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33 | ||
34 | 18 | public abstract class MapTagSupport extends DynaTagSupport { |
35 | ||
36 | private Map map; |
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37 | ||
38 | /** Sets an attribute value of this tag before the tag is invoked |
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39 | */ |
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40 | public void setAttribute(String name, Object value) { |
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41 | 68 | getAttributes().put(name, value); |
42 | 68 | } |
43 | ||
44 | /** |
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45 | * Helper method which allows derived tags to access the attributes |
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46 | * associated with this tag |
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47 | */ |
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48 | protected Map getAttributes() { |
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49 | 86 | if (map == null) { |
50 | 18 | map = createAttributes(); |
51 | } |
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52 | 86 | return map; |
53 | } |
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54 | /** |
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55 | * A Factory Method which allows derived tags to overload the Map |
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56 | * implementation used by this tag |
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57 | */ |
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58 | ||
59 | protected Map createAttributes() { |
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60 | 18 | return new HashMap(); |
61 | } |
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62 | ||
63 | } |
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