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| org.apache.commons.jexl.parser.ASTArrayAccess | 
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| 1 |  /* | |
| 2 |   * Copyright 2002-2006 The Apache Software Foundation. | |
| 3 |   * | |
| 4 |   * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 |   * you may not use this file except in compliance with the License. | |
| 6 |   * You may obtain a copy of the License at | |
| 7 |   * | |
| 8 |   *      http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 |   * | |
| 10 |   * Unless required by applicable law or agreed to in writing, software | |
| 11 |   * distributed under the License is distributed on an "AS IS" BASIS, | |
| 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; | |
| 18 | ||
| 19 |  import org.apache.commons.jexl.JexlContext; | |
| 20 |  import org.apache.commons.jexl.util.Coercion; | |
| 21 |  import org.apache.commons.jexl.util.Introspector; | |
| 22 |  import org.apache.commons.jexl.util.introspection.Info; | |
| 23 |  import org.apache.commons.jexl.util.introspection.VelPropertyGet; | |
| 24 | ||
| 25 |  import java.util.List; | |
| 26 |  import java.util.Map; | |
| 27 |  import java.lang.reflect.Array; | |
| 28 | ||
| 29 |  /** | |
| 30 |   * Like an ASTIdentifier, but with array access allowed. | |
| 31 |   *  | |
| 32 |   * $foo[2] | |
| 33 |   *  | |
| 34 |   * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> | |
| 35 |   * @version $Id: ASTArrayAccess.java 398180 2006-04-29 15:40:35Z dion $ | |
| 36 |   */ | |
| 37 | public class ASTArrayAccess extends SimpleNode { | |
| 38 |      /** dummy velocity info. */ | |
| 39 | 3 | private static final Info DUMMY = new Info("", 1, 1); | 
| 40 | ||
| 41 |      /** | |
| 42 |       * Create the node given an id. | |
| 43 |       *  | |
| 44 |       * @param id node id. | |
| 45 |       */ | |
| 46 | public ASTArrayAccess(int id) { | |
| 47 | 0 |          super(id); | 
| 48 | 0 |      } | 
| 49 | ||
| 50 |      /** | |
| 51 |       * Create a node with the given parser and id. | |
| 52 |       *  | |
| 53 |       * @param p a parser. | |
| 54 |       * @param id node id. | |
| 55 |       */ | |
| 56 | public ASTArrayAccess(Parser p, int id) { | |
| 57 | 13 |          super(p, id); | 
| 58 | 13 | } | 
| 59 | ||
| 60 |      /** {@inheritDoc} */ | |
| 61 |      public Object jjtAccept(ParserVisitor visitor, Object data) { | |
| 62 | 0 |          return visitor.visit(this, data); | 
| 63 | } | |
| 64 | ||
| 65 |      /** | |
| 66 |       * evaluate array access upon a base object. | |
| 67 |       *  | |
| 68 |       * foo.bar[2] | |
| 69 |       *  | |
| 70 |       * makes me rethink the array operator :) | |
| 71 |       * @param jc the {@link JexlContext} to evaluate against. | |
| 72 |       * @param obj not used. | |
| 73 |       * @return the value of the array expression. | |
| 74 |       * @throws Exception on any error | |
| 75 |       */ | |
| 76 |      public Object execute(Object obj, JexlContext jc) throws Exception { | |
| 77 | 2 | ASTIdentifier base = (ASTIdentifier) jjtGetChild(0); | 
| 78 | ||
| 79 | 2 | Object result = base.execute(obj, jc); | 
| 80 | ||
| 81 |          /* | |
| 82 |           * ignore the first child - it's our identifier | |
| 83 |           */ | |
| 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 | } | |
| 90 | ||
| 91 | 3 | result = evaluateExpr(result, loc); | 
| 92 | } | |
| 93 | ||
| 94 | 2 |          return result; | 
| 95 | } | |
| 96 | ||
| 97 |      /** {@inheritDoc} */ | |
| 98 |      public Object value(JexlContext jc) throws Exception { | |
| 99 |          /* | |
| 100 |           * get the base ASTIdentifier | |
| 101 |           */ | |
| 102 | ||
| 103 | 11 | ASTIdentifier base = (ASTIdentifier) jjtGetChild(0); | 
| 104 | ||
| 105 | 11 | Object o = base.value(jc); | 
| 106 | ||
| 107 |          /* | |
| 108 |           * ignore the first child - it's our identifier | |
| 109 |           */ | |
| 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 | } | |
| 116 | ||
| 117 | 12 | o = evaluateExpr(o, loc); | 
| 118 | } | |
| 119 | ||
| 120 | 11 |          return o; | 
| 121 | } | |
| 122 | ||
| 123 |      /** | |
| 124 |       * Evaluate the Array expression 'loc' on the given object, o. | |
| 125 |       * e.g. in 'a[2]', <code>2</code> is 'loc' and <code>a</code> is 'o'. | |
| 126 |       *  | |
| 127 |       * If o or loc are null, null is returned. | |
| 128 |       * If o is a Map, o.get(loc) is returned. | |
| 129 |       * If o is a List, o.get(loc) is returned. loc must resolve to an int value. | |
| 130 |       * If o is an Array, o[loc] is returned. loc must resolve to an int value. | |
| 131 |       * Otherwise loc is treated as a bean property of o. | |
| 132 |       *   | |
| 133 |       * @param o an object to be accessed using the array operator or '.' operator. | |
| 134 |       * @param loc the index of the object to be returned. | |
| 135 |       * @return the resulting value. | |
| 136 |       * @throws Exception on any error. | |
| 137 |       */ | |
| 138 | public static Object evaluateExpr(Object o, Object loc) throws Exception { | |
| 139 |          /* | |
| 140 |           * following the JSTL EL rules | |
| 141 |           */ | |
| 142 | ||
| 143 | 55 | if (o == null) { | 
| 144 | 15 | return null; | 
| 145 | } | |
| 146 | ||
| 147 | 40 | if (loc == null) { | 
| 148 | 0 |              return null; | 
| 149 | } | |
| 150 | ||
| 151 | 40 |          if (o instanceof Map) { | 
| 152 | 5 |              if (!((Map) o).containsKey(loc)) { | 
| 153 | 0 |                  return null; | 
| 154 | } | |
| 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 { | |
| 161 | 4 |                  return ((List) o).get(idx); | 
| 162 |              } catch (IndexOutOfBoundsException iobe) { | |
| 163 | 0 |                  return null; | 
| 164 | } | |
| 165 | 31 | } else if (o.getClass().isArray()) { | 
| 166 | 8 | int idx = Coercion.coerceInteger(loc).class="keyword">intValue(); | 
| 167 | ||
| 168 |              try { | |
| 169 | 8 |                  return Array.get(o, idx); | 
| 170 |              } catch (ArrayIndexOutOfBoundsException aiobe) { | |
| 171 | 0 |                  return null; | 
| 172 | } | |
| 173 |          } else { | |
| 174 |              /* | |
| 175 |               * "Otherwise (a JavaBean object)..." huh? :) | |
| 176 |               */ | |
| 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 | } | |
| 186 | ||
| 187 | 0 |          throw new Exception("Unsupported object type for array [] accessor"); | 
| 188 | } | |
| 189 | ||
| 190 |      /** | |
| 191 |       * Gets the variable name piece of the expression. | |
| 192 |       * @return a String of the identifer.  | |
| 193 |       * @see ASTIdentifier#getIdentifierString(). | |
| 194 |       */ | |
| 195 |      public String getIdentifierString() { | |
| 196 | 0 |          return ((ASTIdentifier) jjtGetChild(0)).getIdentifierString(); | 
| 197 | } | |
| 198 | } | 
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