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org.apache.commons.jelly.tags.core.BreakTag |
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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.TagSupport; |
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19 | import org.apache.commons.jelly.XMLOutput; |
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20 | import org.apache.commons.jelly.impl.BreakException; |
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21 | import org.apache.commons.jelly.expression.Expression; |
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22 | ||
23 | /** |
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24 | * A tag which terminates the execution of the current <forEach> or ≶while> |
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25 | * loop. This tag can take an optional boolean test attribute which if its true |
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26 | * then the break occurs otherwise the loop continues processing. |
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27 | * |
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28 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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29 | * @version $Revision: 1.9 $ |
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30 | */ |
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31 | public class BreakTag extends TagSupport { |
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32 | ||
33 | /** The expression to evaluate. */ |
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34 | private Expression test; |
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35 | ||
36 | /** |
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37 | * If specified, the given variable will hold a true/false value |
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38 | * indicating if the loop was broken. |
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39 | */ |
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40 | private String var; |
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41 | ||
42 | 186 | public BreakTag() { |
43 | 186 | } |
44 | ||
45 | // Tag interface |
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46 | //------------------------------------------------------------------------- |
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47 | public void doTag(XMLOutput output) throws BreakException { |
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48 | 186 | boolean broken = false; |
49 | 186 | if (test == null || test.evaluateAsBoolean(context)) { |
50 | 32 | broken = true; |
51 | } |
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52 | 186 | if ( var != null ) { |
53 | 120 | context.setVariable( this.var, String.valueOf(broken)); |
54 | } |
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55 | 186 | if ( broken ) { |
56 | 32 | throw new BreakException(); |
57 | } |
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58 | 154 | } |
59 | ||
60 | /** |
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61 | * Sets the Jelly expression to evaluate (optional). |
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62 | * If this is <code>null</code> or evaluates to |
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63 | * <code>true</code> then the loop is terminated |
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64 | * |
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65 | * @param test the Jelly expression to evaluate |
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66 | */ |
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67 | public void setTest(Expression test) { |
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68 | 174 | this.test = test; |
69 | 174 | } |
70 | ||
71 | /** |
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72 | * Sets the variable name to export indicating if the item was broken |
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73 | * @param var name of the variable to be exported |
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74 | */ |
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75 | public void setVar(String var) { |
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76 | 120 | this.var = class="keyword">var; |
77 | 120 | } |
78 | ||
79 | } |
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