|
1
2
3 package org.apache.el.parser;
4
5 import java.util.Collection  ;
6 import java.util.Map ;
7
8 import javax.el.ELException;
9
10 import org.apache.el.lang.EvaluationContext;
11
12
13
17 public final class AstEmpty extends SimpleNode {
18 public AstEmpty(int id) {
19 super(id);
20 }
21
22 public Class getType(EvaluationContext ctx)
23 throws ELException {
24 return Boolean .class;
25 }
26
27 public Object getValue(EvaluationContext ctx)
28 throws ELException {
29 Object obj = this.children[0].getValue(ctx);
30 if (obj == null) {
31 return Boolean.TRUE;
32 } else if (obj instanceof String ) {
33 return Boolean.valueOf(((String ) obj).length() == 0);
34 } else if (obj instanceof Object []) {
35 return Boolean.valueOf(((Object []) obj).length == 0);
36 } else if (obj instanceof Collection ) {
37 return Boolean.valueOf(((Collection ) obj).isEmpty());
38 } else if (obj instanceof Map ) {
39 return Boolean.valueOf(((Map ) obj).isEmpty());
40 }
41 return Boolean.FALSE;
42 }
43 }
44 |
Popular Tags |
Java API By Example, From Geeks To Geeks.