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17 package org.apache.commons.jexl.parser;
18
19 import java.util.Iterator;
20
21 import org.apache.commons.jexl.JexlContext;
22 import org.apache.commons.jexl.util.Introspector;
23 import org.apache.commons.jexl.util.introspection.Info;
24
25 /***
26 * ForEach statement. Syntax: foreach (var in iterable) Statement()
27 *
28 * @author Dion Gillard
29 * @since 1.1
30 */
31 public class ASTForeachStatement extends SimpleNode {
32 /*** dummy velocity info. */
33 private static final Info DUMMY = new Info("", 1, 1);
34 /*** index of the loop variable. */
35 private static final int VAR_INDEX = 0;
36 /*** index of the items. */
37 private static final int ITEMS_INDEX = 1;
38 /*** index of the code to execute. */
39 private static final int STATEMENT_INDEX = 2;
40
41
42 /***
43 * Create the node given an id.
44 *
45 * @param id node id.
46 */
47 public ASTForeachStatement(int id) {
48 super(id);
49 }
50
51 /***
52 * Create a node with the given parser and id.
53 *
54 * @param p a parser.
55 * @param id node id.
56 */
57 public ASTForeachStatement(Parser p, int id) {
58 super(p, id);
59 }
60
61 /*** {@inheritDoc} */
62 public Object jjtAccept(ParserVisitor visitor, Object data) {
63 return visitor.visit(this, data);
64 }
65
66 /*** {@inheritDoc} */
67 public Object value(JexlContext jc) throws Exception {
68 Object result = null;
69
70 ASTReference loopVariable = (ASTReference) jjtGetChild(VAR_INDEX);
71
72 SimpleNode iterable = (SimpleNode) jjtGetChild(ITEMS_INDEX);
73 Object iterableValue = iterable.value(jc);
74
75 if (iterableValue != null && jjtGetNumChildren() >= (STATEMENT_INDEX + 1)) {
76
77 SimpleNode statement = (SimpleNode) jjtGetChild(2);
78
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80 Iterator itemsIterator = Introspector.getUberspect().getIterator(
81 iterableValue, DUMMY);
82 while (itemsIterator.hasNext()) {
83
84 Object value = itemsIterator.next();
85 jc.getVars().put(loopVariable.getRootString(), value);
86
87 result = statement.value(jc);
88 }
89 }
90 return result;
91 }
92 }