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16  package org.apache.commons.jexl.parser;
17  
18  import org.apache.commons.jexl.JexlContext;
19  
20  /***
21   * Size Method, e.g. size().
22   * 
23   * @author <a href="mailto:mhw@kremvax.net">Mark H. Wilkinson</a>
24   * @version $Id: ASTSizeMethod.java 398324 2006-04-30 12:20:24Z dion $
25   */
26  public class ASTSizeMethod extends SimpleNode {
27      /***
28       * Create the node given an id.
29       * 
30       * @param id node id.
31       */
32      public ASTSizeMethod(int id) {
33          super(id);
34      }
35  
36      /***
37       * Create a node with the given parser and id.
38       * 
39       * @param p a parser.
40       * @param id node id.
41       */
42      public ASTSizeMethod(Parser p, int id) {
43          super(p, id);
44      }
45  
46      /*** {@inheritDoc} */
47      public Object jjtAccept(ParserVisitor visitor, Object data) {
48          return visitor.visit(this, data);
49      }
50  
51      /***
52       * evaluate size as part of an expression on a base object.
53       * 
54       * foo.bar.size
55       * 
56       * @param jc the {@link JexlContext} to evaluate against.
57       * @param obj not used.
58       * @return the value of the array expression.
59       * @throws Exception on any error
60       */
61      public Object execute(Object obj, JexlContext jc) throws Exception {
62          return new Integer(ASTSizeFunction.sizeOf(obj));
63      }
64  
65  }