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org.apache.commons.jexl.parser.ASTReference |
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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.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,v 1.4 2004/09/01 00:35:38 dion Exp $ |
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25 | */ |
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26 | public class ASTReference extends SimpleNode |
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27 | { |
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28 | SimpleNode root; |
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29 | ||
30 | public ASTReference(int id) |
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31 | { |
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32 | 0 | super(id); |
33 | 0 | } |
34 | ||
35 | public ASTReference(Parser p, int id) |
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36 | { |
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37 | 2937 | super(p, id); |
38 | 2937 | } |
39 | ||
40 | ||
41 | /** Accept the visitor. **/ |
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42 | public Object jjtAccept(ParserVisitor visitor, Object data) |
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43 | { |
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44 | 0 | return visitor.visit(this, data); |
45 | } |
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46 | ||
47 | public Object value(JexlContext jc) |
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48 | throws Exception |
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49 | { |
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50 | 2796 | return execute(null,jc); |
51 | } |
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52 | ||
53 | public void jjtClose() |
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54 | { |
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55 | 2922 | root = (SimpleNode) jjtGetChild(0); |
56 | 2922 | } |
57 | ||
58 | public Object execute(Object obj, JexlContext jc) |
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59 | throws Exception |
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60 | { |
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61 | 2796 | Object o = root.value(jc); |
62 | ||
63 | /* |
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64 | * ignore the first child - it's our identifier |
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65 | */ |
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66 | 3777 | for(int i=1; i<jjtGetNumChildren(); i++) |
67 | { |
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68 | 1023 | o = ( (SimpleNode) jjtGetChild(i)).execute(o,jc); |
69 | ||
70 | 558 | // check for a variable in the context named |
71 | 27 | // child0.child1.child2 etc |
72 | 450 | if(o == null) { |
73 | 90 | String varName = getIdentifierToDepth(i); |
74 | 1710 | o = jc.getVars().get(varName); |
75 | } |
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76 | } |
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77 | ||
78 | 1134 | return o; |
79 | } |
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80 | ||
81 | /** |
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82 | * This method returns a variable from this identifier and |
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83 | * it's children. For an expression like 'a.b.c', a is child |
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84 | * zero, b is child 1 and c is child 2. |
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85 | * |
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86 | * @param i the depth of the child nodes to go to |
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87 | * @return the a dotted variable from this identifier and it's |
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88 | * child nodes. |
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89 | */ |
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90 | private String getIdentifierToDepth(int i) { |
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91 | 90 | StringBuffer varName = new StringBuffer(); |
92 | 312 | for (int j = 0; j <=i; j++) { |
93 | 222 | SimpleNode node = (SimpleNode) jjtGetChild(j); |
94 | 222 | if (node instanceof ASTIdentclass="keyword">ifier) { |
95 | 222 | varName.append(((ASTIdentifier)node).getIdentifierString()); |
96 | 222 | if (j != i) varName.append('.'); |
97 | } |
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98 | } |
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99 | 90 | return varName.toString(); |
100 | } |
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101 | ||
102 | public String getRootString() |
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103 | throws Exception |
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104 | { |
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105 | 0 | if ( root instanceof ASTIdentclass="keyword">ifier) |
106 | 0 | return ((ASTIdentifier) root).getIdentifierString(); |
107 | ||
108 | 0 | if (root instanceof ASTArrayAccess) |
109 | 0 | return ((ASTArrayAccess) root).getIdentifierString(); |
110 | ||
111 | 0 | throw new Exception("programmer error : ASTReference : root not known" |
112 | + root ); |
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113 | } |
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114 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |