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org.apache.commons.jelly.tags.xml.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.xml; |
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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.XMLOutput; |
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21 | import org.apache.commons.jelly.xpath.XPathTagSupport; |
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22 | import org.jaxen.JaxenException; |
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23 | import org.jaxen.XPath; |
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24 | ||
25 | /** |
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26 | * Evaluates the XPath expression to be a boolean and only evaluates the body |
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27 | * if the expression is true. |
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28 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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29 | * @version $Revision: 1.5 $ |
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30 | */ |
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31 | 1 | public class IfTag extends XPathTagSupport { |
32 | ||
33 | /** The XPath expression to evaluate. */ |
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34 | private XPath select; |
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35 | ||
36 | 2 | public IfTag() { |
37 | 2 | } |
38 | ||
39 | // Tag interface |
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40 | //------------------------------------------------------------------------- |
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41 | public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
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42 | 2 | if (select == null) { |
43 | 0 | throw new MissingAttributeException( "select" ); |
44 | } |
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45 | ||
46 | 2 | Object xpathContext = getXPathContext(); |
47 | ||
48 | try { |
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49 | 2 | if ( select.booleanValueOf(xpathContext) ) { |
50 | 0 | invokeBody(output); |
51 | } |
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52 | 2 | } catch (JaxenException e) { |
53 | 0 | throw new JellyTagException(e); |
54 | } |
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55 | 2 | } |
56 | ||
57 | // Properties |
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58 | //------------------------------------------------------------------------- |
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59 | ||
60 | /** Sets the XPath expression to evaluate. */ |
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61 | public void setSelect(XPath select) { |
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62 | 2 | this.select = select; |
63 | 2 | } |
64 | ||
65 | // Implementation methods |
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66 | //------------------------------------------------------------------------- |
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67 | protected Object getXPathContext() { |
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68 | 2 | ForEachTag tag = (ForEachTag) findAncestorWithClass( ForEachTag.class ); |
69 | 2 | if ( tag != null ) { |
70 | 0 | return tag.getXPathContext(); |
71 | } |
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72 | 2 | return null; |
73 | } |
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74 | ||
75 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |