Interface IRelationEvaluator
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public interface IRelationEvaluator
Implementations of this interface take an arbitrary number of input relations with their contents and compute the tuples of a single output relation.- Since:
- 2.8
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description java.util.Set<Tuple>
evaluateRelation(java.util.List<java.util.Set<Tuple>> inputs)
The relation evaluator code.java.util.List<java.lang.Integer>
getInputArities()
For each input relation that this evaluator requires, this method returns the expected arities of the relations in order.int
getOutputArity()
Returns the arity of the output relation that this evaluator computes.java.lang.String
getShortDescription()
A textual description of the evaluator.
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Method Detail
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getShortDescription
java.lang.String getShortDescription()
A textual description of the evaluator. Used only for debug purposes, but must not be null.
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evaluateRelation
java.util.Set<Tuple> evaluateRelation(java.util.List<java.util.Set<Tuple>> inputs) throws java.lang.Exception
The relation evaluator code. For performance reasons, it is expected that the returned set is a mutable collection, and the caller must be allowed to actually perform mutations!- Throws:
java.lang.Exception
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getInputArities
java.util.List<java.lang.Integer> getInputArities()
For each input relation that this evaluator requires, this method returns the expected arities of the relations in order.
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getOutputArity
int getOutputArity()
Returns the arity of the output relation that this evaluator computes.
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