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org.apache.commons.jelly.tags.core.WhenTag |
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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.TagSupport; |
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20 | import org.apache.commons.jelly.XMLOutput; |
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21 | import org.apache.commons.jelly.expression.Expression; |
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22 | ||
23 | /** A tag which conditionally evaluates its body based on some condition |
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24 | * |
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25 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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26 | * @version $Revision: 155420 $ |
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27 | */ |
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28 | public class WhenTag extends TagSupport { |
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29 | ||
30 | /** The expression to evaluate. */ |
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31 | private Expression test; |
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32 | ||
33 | 156 | public WhenTag() { |
34 | 156 | } |
35 | ||
36 | // Tag interface |
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37 | //------------------------------------------------------------------------- |
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38 | public void doTag(XMLOutput output) throws JellyTagException { |
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39 | 299 | ChooseTag tag = (ChooseTag) findAncestorWithClass( ChooseTag.class ); |
40 | 260 | if ( tag == null ) { |
41 | 0 | throw new JellyTagException( "This tag must be enclosed inside a <choose> tag" ); |
42 | } |
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43 | 260 | if ( ! tag.isBlockEvaluated() && test != null ) { |
44 | 221 | if ( test.evaluateAsBoolean( context ) ) { |
45 | 91 | tag.setBlockEvaluated(true); |
46 | 91 | invokeBody(output); |
47 | } |
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48 | } |
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49 | 260 | } |
50 | ||
51 | // Properties |
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52 | //------------------------------------------------------------------------- |
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53 | ||
54 | /** Sets the expression to evaluate. */ |
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55 | public void setTest(Expression test) { |
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56 | 260 | this.test = test; |
57 | 260 | } |
58 | ||
59 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |