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org.apache.commons.jexl.parser.ASTEmptyFunction |
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1 | /* |
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2 | * Copyright 2002-2006 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.jexl.parser; |
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18 | ||
19 | import org.apache.commons.jexl.JexlContext; |
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20 | ||
21 | import java.util.Collection; |
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22 | import java.util.Map; |
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23 | ||
24 | /** |
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25 | * function to see if reference doesn't exist in context. |
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26 | * |
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27 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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28 | * @author <a href="mailto:tobrien@apache.org">Tim O'Brien</a> |
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29 | * @version $Id: ASTEmptyFunction.java 398190 2006-04-29 16:04:10Z dion $ |
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30 | */ |
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31 | public class ASTEmptyFunction extends SimpleNode { |
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32 | /** |
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33 | * Create the node given an id. |
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34 | * |
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35 | * @param id node id. |
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36 | */ |
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37 | public ASTEmptyFunction(int id) { |
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38 | 0 | super(id); |
39 | 0 | } |
40 | ||
41 | /** |
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42 | * Create a node with the given parser and id. |
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43 | * |
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44 | * @param p a parser. |
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45 | * @param id node id. |
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46 | */ |
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47 | public ASTEmptyFunction(Parser p, int id) { |
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48 | 22 | super(p, id); |
49 | 22 | } |
50 | ||
51 | /** {@inheritDoc} */ |
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52 | public Object jjtAccept(ParserVisitor visitor, Object data) { |
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53 | 0 | return visitor.visit(this, data); |
54 | } |
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55 | ||
56 | /** {@inheritDoc} */ |
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57 | public Object value(JexlContext jc) throws Exception { |
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58 | 21 | SimpleNode sn = (SimpleNode) jjtGetChild(0); |
59 | ||
60 | /* |
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61 | * I can't believe this |
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62 | */ |
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63 | ||
64 | 21 | Object o = sn.value(jc); |
65 | ||
66 | 21 | if (o == null) { |
67 | 3 | return Boolean.TRUE; |
68 | } |
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69 | ||
70 | 18 | if (o instanceof String && "".equals(o)) { |
71 | 9 | return Boolean.TRUE; |
72 | } |
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73 | ||
74 | 9 | if (o.getClass().isArray() && ((Object[]) o).length == 0) { |
75 | 1 | return Boolean.TRUE; |
76 | } |
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77 | ||
78 | 8 | if (o instanceof Collection && ((Collection) o).isEmpty()) { |
79 | 3 | return Boolean.TRUE; |
80 | } |
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81 | ||
82 | /* |
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83 | * Map isn't a collection |
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84 | */ |
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85 | 5 | if (o instanceof Map && ((Map) o).isEmpty()) { |
86 | 1 | return Boolean.TRUE; |
87 | } |
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88 | ||
89 | 4 | return Boolean.FALSE; |
90 | } |
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91 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |