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org.apache.commons.jelly.tags.core.WhileTag |
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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.tags.core; |
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18 | ||
19 | import org.apache.commons.jelly.JellyTagException; |
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20 | import org.apache.commons.jelly.MissingAttributeException; |
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21 | import org.apache.commons.jelly.TagSupport; |
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22 | import org.apache.commons.jelly.XMLOutput; |
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23 | import org.apache.commons.jelly.expression.Expression; |
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24 | import org.apache.commons.jelly.impl.BreakException; |
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25 | import org.apache.commons.logging.Log; |
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26 | import org.apache.commons.logging.LogFactory; |
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27 | ||
28 | /** |
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29 | * A tag which performs an iteration while the result of an expression is true. |
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30 | * |
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31 | * @author <a href="mailto:eric@ericalexander.net">Eric Alexander</a> |
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32 | * @author dIon Gillard |
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33 | * @version $Revision: 155420 $ |
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34 | */ |
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35 | public class WhileTag extends TagSupport { |
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36 | ||
37 | /** The Log to which logging calls will be made. */ |
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38 | 546 | private static final Log log = LogFactory.getLog(WhileTag.class); |
39 | ||
40 | /** The expression to use to determine if the while should continue */ |
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41 | private Expression test; |
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42 | ||
43 | /** |
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44 | * Create a new while tag |
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45 | */ |
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46 | 26 | public WhileTag() { |
47 | 26 | } |
48 | ||
49 | /** |
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50 | * Tag interface |
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51 | * @param output destination for xml output |
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52 | * @throws MissingAttributeException when the test attribute is missing |
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53 | * @throws Exception for anything else |
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54 | */ |
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55 | public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException { |
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56 | 26 | if (test != null) { |
57 | try { |
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58 | 78 | while (test.evaluateAsBoolean(getContext())) { |
59 | 78 | if (log.isDebugEnabled()) { |
60 | 0 | log.debug("evaluated to true! gonna keep on chuggin!"); |
61 | } |
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62 | 78 | invokeBody(output); |
63 | 52 | } |
64 | } |
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65 | 26 | catch (BreakException e) { |
66 | 26 | if (log.isDebugEnabled()) { |
67 | 0 | log.debug("loop terminated by break: " + e, e); |
68 | } |
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69 | 0 | } |
70 | 26 | } |
71 | else { |
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72 | 0 | throw new MissingAttributeException("test"); |
73 | } |
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74 | 26 | } |
75 | ||
76 | // Properties |
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77 | //------------------------------------------------------------------------- |
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78 | ||
79 | /** |
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80 | * Setter for the expression |
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81 | * @param e the expression to test |
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82 | */ |
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83 | public void setTest(Expression e) { |
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84 | 26 | this.test = e; |
85 | 26 | } |
86 | } |
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87 |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |