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IdAS String Filters

Revision as of 12:19, 30 July 2008 by Jimse.novell.com (Talk | contribs) (ABNF)

Problem

While the current IFilter, IFilterAssertion (and sub-interfaces) are adequate to perform complex searches across an IdAS context, it is cumbersome to code to them. Furthermore, there is currently no way to represent a filter using a string such that it could be passed easily across a wire protocol

Proposals

ABNF

The following ABNF could be used to represent filters as strings. Note that I simply looked at the way today's IFilter is and extrapolated an ABNF.

filter       = LP filteritem RP
filteritem   = assertion / and / or / not
assertion    = resource SP comparator SP value 
and          = AMP 1*filter 
or           = BAR 1*filter
not          = EXC filter
comparator   =
resource     =
value        =

LP           = %x28 ; left paren ("(")
RP           = %x29 ; right paren (")")
SP           = %x20 ; space (" ")
AMP          = %x26 ; ampersand ("&")
BAR          = %x7C ; vertical bar or pipe ("|")
EXC          = %x21 ; exclamation mark ("!")

Examples

Match for any entity with a telephone number of 888-555-1212 or 888-123-4567

(&(http://example.org/attrs/phonenumber a= 888-555-1212)(http://example.org/attrs/phonenumber a= 888-123-4567))

XML

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