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org.apache.commons.jexl.parser.ASTArrayAccess |
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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 | import org.apache.commons.jexl.util.Coercion; |
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21 | import org.apache.commons.jexl.util.Introspector; |
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22 | import org.apache.commons.jexl.util.introspection.Info; |
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23 | import org.apache.commons.jexl.util.introspection.VelPropertyGet; |
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24 | ||
25 | import java.util.List; |
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26 | import java.util.Map; |
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27 | import java.lang.reflect.Array; |
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28 | ||
29 | /** |
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30 | * Like an ASTIdentifier, but with array access allowed. |
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31 | * |
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32 | * $foo[2] |
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33 | * |
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34 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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35 | * @version $Id: ASTArrayAccess.java 398180 2006-04-29 15:40:35Z dion $ |
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36 | */ |
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37 | public class ASTArrayAccess extends SimpleNode { |
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38 | /** dummy velocity info. */ |
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39 | 3 | private static final Info DUMMY = new Info("", 1, 1); |
40 | ||
41 | /** |
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42 | * Create the node given an id. |
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43 | * |
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44 | * @param id node id. |
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45 | */ |
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46 | public ASTArrayAccess(int id) { |
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47 | 0 | super(id); |
48 | 0 | } |
49 | ||
50 | /** |
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51 | * Create a node with the given parser and id. |
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52 | * |
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53 | * @param p a parser. |
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54 | * @param id node id. |
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55 | */ |
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56 | public ASTArrayAccess(Parser p, int id) { |
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57 | 13 | super(p, id); |
58 | 13 | } |
59 | ||
60 | /** {@inheritDoc} */ |
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61 | public Object jjtAccept(ParserVisitor visitor, Object data) { |
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62 | 0 | return visitor.visit(this, data); |
63 | } |
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64 | ||
65 | /** |
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66 | * evaluate array access upon a base object. |
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67 | * |
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68 | * foo.bar[2] |
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69 | * |
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70 | * makes me rethink the array operator :) |
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71 | * @param jc the {@link JexlContext} to evaluate against. |
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72 | * @param obj not used. |
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73 | * @return the value of the array expression. |
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74 | * @throws Exception on any error |
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75 | */ |
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76 | public Object execute(Object obj, JexlContext jc) throws Exception { |
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77 | 2 | ASTIdentifier base = (ASTIdentifier) jjtGetChild(0); |
78 | ||
79 | 2 | Object result = base.execute(obj, jc); |
80 | ||
81 | /* |
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82 | * ignore the first child - it's our identifier |
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83 | */ |
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84 | 5 | for (int i = 1; i < jjtGetNumChildren(); i++) { |
85 | 3 | Object loc = ((SimpleNode) jjtGetChild(i)).value(jc); |
86 | ||
87 | 3 | if (loc == null) { |
88 | 0 | return null; |
89 | } |
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90 | ||
91 | 3 | result = evaluateExpr(result, loc); |
92 | } |
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93 | ||
94 | 2 | return result; |
95 | } |
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96 | ||
97 | /** {@inheritDoc} */ |
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98 | public Object value(JexlContext jc) throws Exception { |
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99 | /* |
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100 | * get the base ASTIdentifier |
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101 | */ |
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102 | ||
103 | 11 | ASTIdentifier base = (ASTIdentifier) jjtGetChild(0); |
104 | ||
105 | 11 | Object o = base.value(jc); |
106 | ||
107 | /* |
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108 | * ignore the first child - it's our identifier |
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109 | */ |
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110 | 23 | for (int i = 1; i < jjtGetNumChildren(); i++) { |
111 | 12 | Object loc = ((SimpleNode) jjtGetChild(i)).value(jc); |
112 | ||
113 | 12 | if (loc == null) { |
114 | 0 | return null; |
115 | } |
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116 | ||
117 | 12 | o = evaluateExpr(o, loc); |
118 | } |
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119 | ||
120 | 11 | return o; |
121 | } |
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122 | ||
123 | /** |
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124 | * Evaluate the Array expression 'loc' on the given object, o. |
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125 | * e.g. in 'a[2]', <code>2</code> is 'loc' and <code>a</code> is 'o'. |
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126 | * |
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127 | * If o or loc are null, null is returned. |
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128 | * If o is a Map, o.get(loc) is returned. |
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129 | * If o is a List, o.get(loc) is returned. loc must resolve to an int value. |
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130 | * If o is an Array, o[loc] is returned. loc must resolve to an int value. |
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131 | * Otherwise loc is treated as a bean property of o. |
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132 | * |
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133 | * @param o an object to be accessed using the array operator or '.' operator. |
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134 | * @param loc the index of the object to be returned. |
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135 | * @return the resulting value. |
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136 | * @throws Exception on any error. |
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137 | */ |
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138 | public static Object evaluateExpr(Object o, Object loc) throws Exception { |
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139 | /* |
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140 | * following the JSTL EL rules |
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141 | */ |
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142 | ||
143 | 55 | if (o == null) { |
144 | 15 | return null; |
145 | } |
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146 | ||
147 | 40 | if (loc == null) { |
148 | 0 | return null; |
149 | } |
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150 | ||
151 | 40 | if (o instanceof Map) { |
152 | 5 | if (!((Map) o).containsKey(loc)) { |
153 | 0 | return null; |
154 | } |
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155 | ||
156 | 5 | return ((Map) o).get(loc); |
157 | 35 | } else if (o instanceof List) { |
158 | 4 | int idx = Coercion.coerceInteger(loc).class="keyword">intValue(); |
159 | ||
160 | try { |
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161 | 4 | return ((List) o).get(idx); |
162 | } catch (IndexOutOfBoundsException iobe) { |
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163 | 0 | return null; |
164 | } |
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165 | 31 | } else if (o.getClass().isArray()) { |
166 | 8 | int idx = Coercion.coerceInteger(loc).class="keyword">intValue(); |
167 | ||
168 | try { |
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169 | 8 | return Array.get(o, idx); |
170 | } catch (ArrayIndexOutOfBoundsException aiobe) { |
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171 | 0 | return null; |
172 | } |
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173 | } else { |
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174 | /* |
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175 | * "Otherwise (a JavaBean object)..." huh? :) |
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176 | */ |
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177 | ||
178 | 23 | String s = loc.toString(); |
179 | ||
180 | 23 | VelPropertyGet vg = Introspector.getUberspect().getPropertyGet(o, s, DUMMY); |
181 | ||
182 | 23 | if (vg != null) { |
183 | 23 | return vg.invoke(o); |
184 | } |
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185 | } |
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186 | ||
187 | 0 | throw new Exception("Unsupported object type for array [] accessor"); |
188 | } |
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189 | ||
190 | /** |
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191 | * Gets the variable name piece of the expression. |
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192 | * @return a String of the identifer. |
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193 | * @see ASTIdentifier#getIdentifierString(). |
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194 | */ |
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195 | public String getIdentifierString() { |
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196 | 0 | return ((ASTIdentifier) jjtGetChild(0)).getIdentifierString(); |
197 | } |
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198 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |