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org.apache.commons.jelly.tags.core.IfTag |
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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 | package org.apache.commons.jelly.tags.core; |
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17 | ||
18 | import org.apache.commons.jelly.JellyTagException; |
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19 | import org.apache.commons.jelly.MissingAttributeException; |
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20 | import org.apache.commons.jelly.TagSupport; |
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21 | import org.apache.commons.jelly.XMLOutput; |
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22 | import org.apache.commons.jelly.expression.Expression; |
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23 | ||
24 | /** A tag which conditionally evaluates its body based on some condition |
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25 | * |
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26 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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27 | * @version $Revision: 155420 $ |
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28 | */ |
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29 | public class IfTag extends TagSupport { |
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30 | ||
31 | /** The expression to evaluate. */ |
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32 | private Expression test; |
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33 | ||
34 | 2691 | public IfTag() { |
35 | 2691 | } |
36 | ||
37 | // Tag interface |
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38 | //------------------------------------------------------------------------- |
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39 | public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
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40 | 2990 | if (test != null) { |
41 | 2990 | if (test.evaluateAsBoolean(context)) { |
42 | 546 | invokeBody(output); |
43 | 377 | } |
44 | } |
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45 | else { |
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46 | 0 | throw new MissingAttributeException( "test" ); |
47 | } |
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48 | ||
49 | 2821 | } |
50 | ||
51 | // Properties |
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52 | //------------------------------------------------------------------------- |
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53 | /** Sets the Jelly expression to evaluate. If this returns true, the body of |
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54 | * the tag is evaluated |
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55 | * |
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56 | * @param test the Jelly expression to evaluate |
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57 | */ |
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58 | public void setTest(Expression test) { |
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59 | 2990 | this.test = test; |
60 | 2990 | } |
61 | } |
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