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Difference between revisions of "IdAS String Filters"
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<pre> | <pre> | ||
| − | filter = LP filteritem RP | + | filter = LP filteritem RP |
| − | filteritem = assertion / and / or / not | + | filteritem = assertion / and / or / not |
| − | assertion = comparator SP resource SP value | + | assertion = comparator SP resource SP value |
| − | and = AMP 1*filter | + | and = AMP 1*filter |
| − | or = BAR 1*filter | + | or = BAR 1*filter |
| − | not = EXC filter | + | not = EXC filter |
| − | comparator = | + | comparator = |
| − | resource = | + | resource = |
| − | value = | + | 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 ("!") | ||
</pre> | </pre> | ||
===XML=== | ===XML=== | ||
Revision as of 19:38, 29 July 2008
Contents
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 = comparator SP resource 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 ("!")