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17 package org.apache.commons.jexl.parser;
18
19 import org.apache.commons.jexl.JexlContext;
20
21 /***
22 * Simple identifier - $foo or $foo.bar (both parts are identifiers).
23 *
24 * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
25 * @version $Id: ASTIdentifier.java 398199 2006-04-29 16:30:05Z dion $
26 */
27 public class ASTIdentifier extends SimpleNode {
28 /*** the name of the variable. */
29 protected String val;
30
31 /***
32 * Create the node given an id.
33 *
34 * @param id node id.
35 */
36 public ASTIdentifier(int id) {
37 super(id);
38 }
39
40 /***
41 * Create a node with the given parser and id.
42 *
43 * @param p a parser.
44 * @param id node id.
45 */
46 public ASTIdentifier(Parser p, int id) {
47 super(p, id);
48 }
49
50 /*** {@inheritDoc} */
51 public Object jjtAccept(ParserVisitor visitor, Object data) {
52 return visitor.visit(this, data);
53 }
54
55 /*** {@inheritDoc} */
56 public Object value(JexlContext jc) throws Exception {
57 return jc.getVars().get(val);
58 }
59
60 /***
61 * returns the value of itself applied to the object. We assume that an
62 * identifier can be gotten via a get(String).
63 * e.g. if we have bean.property, 'property' has been parsed as an identifier,
64 * and we need to resolve the expression by calling the property getter.
65 *
66 * @param obj the object to evaluate against.
67 * @param jc the {@link JexlContext}.
68 * @throws Exception on any error.
69 * @return the resulting value.
70 * @see ASTArrayAccess#evaluateExpr(Object, Object)
71 */
72 public Object execute(Object obj, JexlContext jc) throws Exception {
73 return ASTArrayAccess.evaluateExpr(obj, val);
74 }
75
76 /***
77 * Gets the name of the variable.
78 * @return the variable name.
79 */
80 public String getIdentifierString() {
81 return val;
82 }
83 }