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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. |
|
| 6 | * You may obtain a copy of the License at |
|
| 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 |
|
| 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. |
|
| 13 | * See the License for the specific language governing permissions and |
|
| 14 | * limitations under the License. |
|
| 15 | */ |
|
| 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 | } |
|
| 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 | } |
|
| 198 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |