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| org.apache.commons.jexl.parser.ASTArrayAccess |
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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 | ||
| 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 | ||
| 30 | /** |
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| 31 | * Like an ASTIdentifier, but with array access allowed |
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| 32 | * |
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| 33 | * $foo[2] |
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| 34 | * |
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| 35 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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| 36 | * @version $Id: ASTArrayAccess.java,v 1.7 2004/08/22 07:42:35 dion Exp $ |
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| 37 | */ |
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| 38 | 2 | public class ASTArrayAccess extends SimpleNode |
| 39 | { |
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| 40 | /** dummy velocity info */ |
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| 41 | 30 | private static Info DUMMY = new Info("", 1, 1); |
| 42 | ||
| 43 | public ASTArrayAccess(int id) |
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| 44 | { |
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| 45 | 0 | super(id); |
| 46 | 0 | } |
| 47 | ||
| 48 | public ASTArrayAccess(Parser p, int id) |
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| 49 | { |
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| 50 | 210 | super(p, id); |
| 51 | 210 | } |
| 52 | ||
| 53 | ||
| 54 | /** Accept the visitor. **/ |
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| 55 | public Object jjtAccept(ParserVisitor visitor, Object data) |
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| 56 | { |
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| 57 | 0 | return visitor.visit(this, data); |
| 58 | } |
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| 59 | ||
| 60 | /* |
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| 61 | * evaluate array access upon a base object |
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| 62 | * |
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| 63 | * foo.bar[2] |
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| 64 | * |
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| 65 | * makes me rethink the array operator :) |
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| 66 | */ |
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| 67 | public Object execute(Object obj, JexlContext jc) |
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| 68 | throws Exception |
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| 69 | { |
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| 70 | 30 | ASTIdentifier base = (ASTIdentifier) jjtGetChild(0); |
| 71 | ||
| 72 | 30 | obj = base.execute(obj,jc); |
| 73 | ||
| 74 | /* |
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| 75 | * ignore the first child - it's our identifier |
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| 76 | */ |
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| 77 | 75 | for(int i=1; i<jjtGetNumChildren(); i++) |
| 78 | { |
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| 79 | 45 | Object loc = ((SimpleNode) jjtGetChild(i)).value(jc); |
| 80 | ||
| 81 | 45 | if(loc==null) |
| 82 | 0 | return null; |
| 83 | ||
| 84 | 45 | obj = evaluateExpr(obj, loc); |
| 85 | } |
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| 86 | ||
| 87 | 30 | return obj; |
| 88 | } |
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| 89 | ||
| 90 | /** |
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| 91 | * return the value of this node |
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| 92 | */ |
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| 93 | public Object value(JexlContext jc) |
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| 94 | throws Exception |
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| 95 | { |
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| 96 | /* |
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| 97 | * get the base ASTIdentifier |
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| 98 | */ |
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| 99 | ||
| 100 | 165 | ASTIdentifier base = (ASTIdentifier) jjtGetChild(0); |
| 101 | ||
| 102 | 165 | Object o = base.value(jc); |
| 103 | ||
| 104 | /* |
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| 105 | * ignore the first child - it's our identifier |
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| 106 | */ |
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| 107 | 345 | for(int i=1; i<jjtGetNumChildren(); i++) |
| 108 | { |
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| 109 | 180 | Object loc = ((SimpleNode) jjtGetChild(i)).value(jc); |
| 110 | ||
| 111 | 180 | if(loc==null) |
| 112 | 0 | return null; |
| 113 | ||
| 114 | 180 | o = evaluateExpr(o, loc); |
| 115 | } |
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| 116 | ||
| 117 | 165 | return o; |
| 118 | } |
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| 119 | ||
| 120 | public static Object evaluateExpr(Object o, Object loc) |
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| 121 | throws Exception |
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| 122 | { |
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| 123 | /* |
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| 124 | * following the JSTL EL rules |
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| 125 | */ |
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| 126 | ||
| 127 | 672 | if (o == null) |
| 128 | 117 | return null; |
| 129 | ||
| 130 | 555 | if (loc == null) |
| 131 | 0 | return null; |
| 132 | ||
| 133 | 555 | if (o instanceof Map) |
| 134 | { |
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| 135 | 75 | if (!((Map)o).containsKey(loc)) |
| 136 | 0 | return null; |
| 137 | ||
| 138 | 75 | return ((Map)o).get(loc); |
| 139 | } |
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| 140 | 480 | else if (o instanceof List) |
| 141 | { |
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| 142 | 60 | int idx = Coercion.coerceInteger(loc).class="keyword">intValue(); |
| 143 | ||
| 144 | try |
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| 145 | { |
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| 146 | 60 | return ((List)o).get(idx); |
| 147 | } |
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| 148 | catch(IndexOutOfBoundsException iobe) |
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| 149 | { |
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| 150 | 0 | return null; |
| 151 | } |
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| 152 | } |
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| 153 | 420 | else if (o.getClass().isArray()) |
| 154 | { |
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| 155 | 120 | int idx = Coercion.coerceInteger(loc).class="keyword">intValue(); |
| 156 | ||
| 157 | try |
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| 158 | { |
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| 159 | 120 | return Array.get(o, idx); |
| 160 | } |
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| 161 | catch(ArrayIndexOutOfBoundsException aiobe) |
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| 162 | { |
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| 163 | 0 | return null; |
| 164 | } |
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| 165 | } |
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| 166 | else |
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| 167 | { |
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| 168 | /* |
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| 169 | * "Otherwise (a JavaBean object)..." huh? :) |
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| 170 | */ |
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| 171 | ||
| 172 | 300 | String s = loc.toString(); |
| 173 | ||
| 174 | 300 | VelPropertyGet vg = Introspector.getUberspect().getPropertyGet(o, s, DUMMY); |
| 175 | ||
| 176 | 300 | if (vg != null) |
| 177 | { |
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| 178 | 300 | return vg.invoke(o); |
| 179 | } |
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| 180 | } |
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| 181 | ||
| 182 | 0 | throw new Exception("Unsupported object type for array [] accessor"); |
| 183 | } |
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| 184 | ||
| 185 | public String getIdentifierString() |
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| 186 | { |
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| 187 | 0 | return ((ASTIdentifier) jjtGetChild(0)).getIdentifierString(); |
| 188 | } |
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| 189 | } |
| This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |