[rules-users] Iterating facts

[Davide Sottara]

FactType (and FactField etc..) are an internal representation of a declared
type's CLASS, hence you can get names, types, etc.. but obviously NOT any
instance's values from there. 

You'll need something like this:

FactType factType = ksession.getKnowledgeBase().getFactType(pckg, "Project")
List<FactField> fFields =  factType.getFields(); 

// get all Project INSTANCES currently in the WM
Collection objs = kSession.getObjects( new ClassObjectFilter(
factType.getFactClass() );
for ( Object o : objs ) 
  for ( FactField field : fFields )  
    Object fieldValue = factType.get( o, field.getName() );


FactType exposes generic "get" and "set" methods which use a reflection-like
mechanism to operate on instances extracted from the WM. Notice that since
declared types are transformed into classes at RUNTIME, there is no way to
do it at compile time without this "meta" approach.

Best
Davide







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