Bug 8077

Summary:	add "empty" EL operator
Product:	Taglibs	Reporter:	Nathan Abramson <arista>
Component:	Standard Taglib	Assignee:	Tomcat Developers Mailing List <dev>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	P3
Version:	unspecified
Target Milestone:	---
Hardware:	All
OS:	All

Description Nathan Abramson 2002-04-14 23:11:13 UTC

Add "empty A" operator with same precedence as "not" and unary minus.
empty A evaluates to true if:

  A is null
  A is a zero-length String
  A is a zero-length array
  A is a List and ((List) A).isEmpty()
  A is a Map and ((Map) A).isEmpty()

otherwise empty A evaluates to false

Comment 1 Nathan Abramson 2002-04-14 23:35:20 UTC

The empty EL operator has been added as EmptyOperator.java