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17 package org.apache.commons.jexl.parser;
18
19 import org.apache.commons.jexl.JexlContext;
20
21 /***
22 * x = y, assigns a value to a variable in the context.
23 *
24 * @author Dion Gillard
25 *
26 */
27 public class ASTAssignment extends SimpleNode {
28 /***
29 * Create the node given an id.
30 *
31 * @param id node id.
32 */
33 public ASTAssignment(int id) {
34 super(id);
35 }
36
37 /***
38 * Create a node with the given parser and id.
39 *
40 * @param p a parser.
41 * @param id node id.
42 */
43 public ASTAssignment(Parser p, int id) {
44 super(p, id);
45 }
46
47 /*** {@inheritDoc} */
48 public Object jjtAccept(ParserVisitor visitor, Object data) {
49 return visitor.visit(this, data);
50 }
51
52 /*** {@inheritDoc} */
53 public Object value(JexlContext context) throws Exception {
54
55 SimpleNode left = (SimpleNode) jjtGetChild(0);
56
57 Object right = ((SimpleNode) jjtGetChild(1)).value(context);
58 if (left instanceof ASTReference) {
59 ASTReference reference = (ASTReference) left;
60 left = (SimpleNode) reference.jjtGetChild(0);
61 if (left instanceof ASTIdentifier) {
62 String identifier = ((ASTIdentifier) left)
63 .getIdentifierString();
64 context.getVars().put(identifier, right);
65 }
66 }
67 return right;
68 }
69 }