Filtering for options-enumeration/options-collection
----------------------------------------------------
Key: STS-300
URL: http://mc4j.org/jira/browse/STS-300
Project: Stripes
Issue Type: New Feature
Components: Tag Library
Affects Versions: Release 1.4.1
Reporter: Andy
Assigned To: Tim Fennell
Currently the options-enumeration and options-collection tags render all values
in the enum or collection.
They will be more useful if filtering criteria can be specified when not all
values should be rendered.
package xxx.enums;
public enum MyNumber { ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN;
public boolean getIsPrime() { return this==TWO || this==THREE || this==FIVE ||
this==SEVEN; }
public boolean getIsEven() { return (ordinal() % 2) == 1; }
}
<stripes:options-enumeration enum="xxx.enums.MyNumber"/>
(renders all seven options)
<stripes:options-enumeration enum="xxx.enums.MyNumber" where="isPrime"/>
(renders only TWO, THREE, FIVE, SEVEN)
<stripes:options-enumeration enum="xxx.enums.MyNumber" where="isEven"/>
(renders only TWO, FOUR, SIX)
If the proposed where= attribute supports some kind of expression language
(EL?), it will be much more flexible:
<stripes:options-enumeration enum="xxx.enums.MyNumber" where="isPrime &&
!isEven"/>
(renders only THREE, FIVE, SEVEN)
For symmetry, the options-collection tag should likewise take a where=
attribute.
A typical use would be, where="theCurrentUserCanSeeThisOption" :)
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