There was some talk on taglibs-user about EL "empty" only working with java.util.Map and java.util.List.
here's a (simple) patch for jexl that makes ASTEmptyOperator work for all Collections. -------- Tim O'Brien
Index: src/java/org/apache/commons/jexl/parser/ASTEmptyFunction.java =================================================================== RCS file: /home/cvs/jakarta-commons/jexl/src/java/org/apache/commons/jexl/parser/ASTEmptyFunction.java,v retrieving revision 1.1 diff -u -r1.1 ASTEmptyFunction.java --- src/java/org/apache/commons/jexl/parser/ASTEmptyFunction.java 26 Apr 2002 04:23:14 -0000 1.1 +++ src/java/org/apache/commons/jexl/parser/ASTEmptyFunction.java 13 Feb 2003 +18:18:22 -0000 @@ -56,13 +56,13 @@ import org.apache.commons.jexl.JexlContext; -import java.util.List; -import java.util.Map; +import java.util.Collection; /** * function to see if reference doesn't exist in context * * @author <a href="mailto:[EMAIL PROTECTED]";>Geir Magnusson Jr.</a> + * @author <a href="mailto:[EMAIL PROTECTED]";>Tim O'Brien</a> * @version $Id: ASTEmptyFunction.java,v 1.1 2002/04/26 04:23:14 geirm Exp $ */ public class ASTEmptyFunction extends SimpleNode @@ -107,10 +107,7 @@ if (o.getClass().isArray() && ((Object[])o).length == 0) return Boolean.TRUE; - if (o instanceof Map && ((Map)o).isEmpty()) - return Boolean.TRUE; - - if (o instanceof List && ((List)o).isEmpty()) + if (o instanceof Collection && ((Collection)o).isEmpty()) return Boolean.TRUE; return Boolean.FALSE;
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