[rules-users] facts custom sort

[Syargey]

I don't want to sort facts outside of drools rules. The sorting is part of
business requirements. My opinion is that is not a good thing to keep parts
of business logic in different places.

I spent some time to figure out how it is possible to sort a collection of
facts and here is my solution:
---------------------------
function String factKey(Fact f) 
{
    return String.format( "%010d~~%s~~%s", f.getRank(), f.getName(),
f.getValue() );
}

query sortFactsQuery
    $factsMap: HashMap()
        from accumulate( $f: Fact(),
                     init( HashMap map = new HashMap(); ),
                   action( map.put(factKey($f), $f); ),
                   reverse( map.remove(factKey($f)); ),
                   result( map ) )
    $sortedKeyList: TreeSet() 
        from collect( String() from $factsMap.keySet() )
    $sortedFacts: List()
    	from accumulate( $key: String() from $sortedKeyList,
    					collectList( $factsMap.get( $key ) ) )
end
-----------------------

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