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Language:
English
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Language:
English
13.26. The Conditional Element Collect
The Conditional Element
collect
allows rules to reason over a collection of objects obtained from the given source or from the working memory. In First Oder Logic terms this is the cardinality quantifier.
The result pattern of
collect
can be any concrete class that implements the java.util.Collection
interface and provides a default no-arg public constructor. You can use Java collections like ArrayList, LinkedList and HashSet or your own class, as long as it implements the java.util.Collection
interface and provide a default no-arg public constructor.
Variables bound before the
collect
CE are in the scope of both source and result patterns and therefore you can use them to constrain both your source and result patterns. Any binding made inside collect
is not available for use outside of it.