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| org.apache.commons.jexl.parser.ASTReference | 
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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 |  package org.apache.commons.jexl.parser; | |
| 17 | ||
| 18 |  import org.apache.commons.jexl.JexlContext; | |
| 19 | ||
| 20 |  /** | |
| 21 |   * reference - any variable expression. | |
| 22 |   *  | |
| 23 |   * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> | |
| 24 |   * @version $Id: ASTReference.java 398272 2006-04-30 03:14:01Z dion $ | |
| 25 |   */ | |
| 26 | public class ASTReference extends SimpleNode { | |
| 27 |      /** first variable in the expression. */ | |
| 28 |      protected SimpleNode root; | |
| 29 | ||
| 30 |      /** | |
| 31 |       * Create the node given an id. | |
| 32 |       *  | |
| 33 |       * @param id node id. | |
| 34 |       */ | |
| 35 | public ASTReference(int id) { | |
| 36 | 0 |          super(id); | 
| 37 | 0 |      } | 
| 38 | ||
| 39 |      /** | |
| 40 |       * Create a node with the given parser and id. | |
| 41 |       *  | |
| 42 |       * @param p a parser. | |
| 43 |       * @param id node id. | |
| 44 |       */ | |
| 45 | public ASTReference(Parser p, int id) { | |
| 46 | 354 |          super(p, id); | 
| 47 | 354 | } | 
| 48 | ||
| 49 |      /** {@inheritDoc} */ | |
| 50 |      public Object jjtAccept(ParserVisitor visitor, Object data) { | |
| 51 | 0 |          return visitor.visit(this, data); | 
| 52 | } | |
| 53 | ||
| 54 |      /** {@inheritDoc} */ | |
| 55 |      public Object value(JexlContext jc) throws Exception { | |
| 56 | 448 | return execute(null, jc); | 
| 57 | } | |
| 58 | ||
| 59 |      /** Store the first child as {@link ASTReference#root root}. */ | |
| 60 | public void jjtClose() { | |
| 61 | 353 | root = (SimpleNode) jjtGetChild(0); | 
| 62 | 353 | } | 
| 63 | ||
| 64 |      /** | |
| 65 |       * evaluate each piece of the reference. | |
| 66 |       *  | |
| 67 |       * e.g. foo.bar.woogie[2].name, foo is our 'root', and we need to | |
| 68 |       * evaluate 'bar.woogie[2].name' relative to foo. | |
| 69 |       *  | |
| 70 |       * @param jc the {@link JexlContext} to evaluate against. | |
| 71 |       * @param obj not used. root.value(jc) is used instead. | |
| 72 |       * @return the value of the array expression. | |
| 73 |       * @throws Exception on any error | |
| 74 |       */ | |
| 75 |      public Object execute(Object obj, JexlContext jc) throws Exception { | |
| 76 | 448 | Object o = root.value(jc); | 
| 77 | ||
| 78 |          /* | |
| 79 |           * ignore the first child - it's our identifier | |
| 80 |           */ | |
| 81 | 533 | for (int i = 1; i < jjtGetNumChildren(); i++) { | 
| 82 | 86 | o = ((SimpleNode) jjtGetChild(i)).execute(o, jc); | 
| 83 | ||
| 84 |              // check for a variable in the context named | |
| 85 |              // child0.child1.child2 etc | |
| 86 | 85 | if (o == null) { | 
| 87 | 20 | String varName = getIdentifierToDepth(i); | 
| 88 | 20 | o = jc.getVars().get(varName); | 
| 89 | } | |
| 90 | } | |
| 91 | ||
| 92 | 447 |          return o; | 
| 93 | } | |
| 94 | ||
| 95 |      /** | |
| 96 |       * This method returns a variable from this identifier and it's children. | |
| 97 |       * For an expression like 'a.b.c', a is child zero, b is child 1 and c is | |
| 98 |       * child 2. | |
| 99 |       *  | |
| 100 |       * @param i the depth of the child nodes to go to | |
| 101 |       * @return the a dotted variable from this identifier and it's child nodes. | |
| 102 |       */ | |
| 103 | private String getIdentifierToDepth(int i) { | |
| 104 | 20 |          StringBuffer varName = new StringBuffer(); | 
| 105 | 68 | for (int j = 0; j <= i; j++) { | 
| 106 | 48 | SimpleNode node = (SimpleNode) jjtGetChild(j); | 
| 107 | 48 | if (node instanceof ASTIdentclass="keyword">ifier) { | 
| 108 | 44 | varName.append(((ASTIdentifier) node).getIdentifierString()); | 
| 109 | 44 |                  if (j != i) { | 
| 110 | 28 |                      varName.append('.'); | 
| 111 | } | |
| 112 | } | |
| 113 | } | |
| 114 | 20 |          return varName.toString(); | 
| 115 | } | |
| 116 | ||
| 117 |      /** | |
| 118 |       * Gets the variable name of {@link ASTReference#root root}. | |
| 119 |       * @return the identifier. | |
| 120 |       * @throws Exception on any error | |
| 121 |       * @see ASTIdentifier#getIdentifierString() | |
| 122 |       * @see ASTArrayAccess#getIdentifierString() | |
| 123 |       */ | |
| 124 |      public String getRootString() throws Exception { | |
| 125 | 107 | if (root instanceof ASTIdentclass="keyword">ifier) { | 
| 126 | 107 |              return ((ASTIdentifier) root).getIdentifierString(); | 
| 127 | } | |
| 128 | ||
| 129 | 0 |          if (root instanceof ASTArrayAccess) { | 
| 130 | 0 |              return ((ASTArrayAccess) root).getIdentifierString(); | 
| 131 | } | |
| 132 | ||
| 133 | 0 |          throw new Exception("programmer error : ASTReference : root not known" + root); | 
| 134 | } | |
| 135 | } | 
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