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org.apache.commons.jexl.parser.ASTReference |
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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 | package org.apache.commons.jexl.parser; |
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17 | ||
18 | import org.apache.commons.jexl.JexlContext; |
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19 | ||
20 | /** |
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21 | * reference - any variable expression. |
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22 | * |
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23 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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24 | * @version $Id: ASTReference.java 398272 2006-04-30 03:14:01Z dion $ |
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25 | */ |
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26 | public class ASTReference extends SimpleNode { |
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27 | /** first variable in the expression. */ |
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28 | protected SimpleNode root; |
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29 | ||
30 | /** |
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31 | * Create the node given an id. |
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32 | * |
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33 | * @param id node id. |
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34 | */ |
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35 | public ASTReference(int id) { |
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36 | 0 | super(id); |
37 | 0 | } |
38 | ||
39 | /** |
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40 | * Create a node with the given parser and id. |
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41 | * |
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42 | * @param p a parser. |
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43 | * @param id node id. |
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44 | */ |
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45 | public ASTReference(Parser p, int id) { |
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46 | 354 | super(p, id); |
47 | 354 | } |
48 | ||
49 | /** {@inheritDoc} */ |
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50 | public Object jjtAccept(ParserVisitor visitor, Object data) { |
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51 | 0 | return visitor.visit(this, data); |
52 | } |
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53 | ||
54 | /** {@inheritDoc} */ |
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55 | public Object value(JexlContext jc) throws Exception { |
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56 | 448 | return execute(null, jc); |
57 | } |
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58 | ||
59 | /** Store the first child as {@link ASTReference#root root}. */ |
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60 | public void jjtClose() { |
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61 | 353 | root = (SimpleNode) jjtGetChild(0); |
62 | 353 | } |
63 | ||
64 | /** |
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65 | * evaluate each piece of the reference. |
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66 | * |
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67 | * e.g. foo.bar.woogie[2].name, foo is our 'root', and we need to |
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68 | * evaluate 'bar.woogie[2].name' relative to foo. |
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69 | * |
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70 | * @param jc the {@link JexlContext} to evaluate against. |
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71 | * @param obj not used. root.value(jc) is used instead. |
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72 | * @return the value of the array expression. |
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73 | * @throws Exception on any error |
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74 | */ |
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75 | public Object execute(Object obj, JexlContext jc) throws Exception { |
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76 | 448 | Object o = root.value(jc); |
77 | ||
78 | /* |
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79 | * ignore the first child - it's our identifier |
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80 | */ |
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81 | 533 | for (int i = 1; i < jjtGetNumChildren(); i++) { |
82 | 86 | o = ((SimpleNode) jjtGetChild(i)).execute(o, jc); |
83 | ||
84 | // check for a variable in the context named |
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85 | // child0.child1.child2 etc |
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86 | 85 | if (o == null) { |
87 | 20 | String varName = getIdentifierToDepth(i); |
88 | 20 | o = jc.getVars().get(varName); |
89 | } |
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90 | } |
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91 | ||
92 | 447 | return o; |
93 | } |
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94 | ||
95 | /** |
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96 | * This method returns a variable from this identifier and it's children. |
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97 | * For an expression like 'a.b.c', a is child zero, b is child 1 and c is |
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98 | * child 2. |
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99 | * |
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100 | * @param i the depth of the child nodes to go to |
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101 | * @return the a dotted variable from this identifier and it's child nodes. |
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102 | */ |
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103 | private String getIdentifierToDepth(int i) { |
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104 | 20 | StringBuffer varName = new StringBuffer(); |
105 | 68 | for (int j = 0; j <= i; j++) { |
106 | 48 | SimpleNode node = (SimpleNode) jjtGetChild(j); |
107 | 48 | if (node instanceof ASTIdentclass="keyword">ifier) { |
108 | 44 | varName.append(((ASTIdentifier) node).getIdentifierString()); |
109 | 44 | if (j != i) { |
110 | 28 | varName.append('.'); |
111 | } |
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112 | } |
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113 | } |
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114 | 20 | return varName.toString(); |
115 | } |
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116 | ||
117 | /** |
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118 | * Gets the variable name of {@link ASTReference#root root}. |
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119 | * @return the identifier. |
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120 | * @throws Exception on any error |
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121 | * @see ASTIdentifier#getIdentifierString() |
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122 | * @see ASTArrayAccess#getIdentifierString() |
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123 | */ |
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124 | public String getRootString() throws Exception { |
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125 | 107 | if (root instanceof ASTIdentclass="keyword">ifier) { |
126 | 107 | return ((ASTIdentifier) root).getIdentifierString(); |
127 | } |
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128 | ||
129 | 0 | if (root instanceof ASTArrayAccess) { |
130 | 0 | return ((ASTArrayAccess) root).getIdentifierString(); |
131 | } |
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132 | ||
133 | 0 | throw new Exception("programmer error : ASTReference : root not known" + root); |
134 | } |
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135 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |