jadex.rules.rulesystem.rete.extractors

Interface IValueExtractor

All Known Implementing Classes:

ChainedExtractor, ConstantExtractor, FunctionExtractor, JavaArrayExtractor, JavaMethodExtractor, JavaObjectExtractor, JavaPrefixExtractor, JavaTupleExtractor, MultifieldExtractor, ObjectExtractor, PrefixExtractor, StateExtractor, TupleExtractor

public interface IValueExtractor

A value extractor is responsible for extracting a certain attribute or object value from a tuple or object.

Method Summary

Modifier and Type	Method and Description
AttributeSet	getIndirectAttributes() Get the set of indirect attribute types.
AttributeSet	getRelevantAttributes() Get the set of relevant attribute types.
java.lang.Object	getValue(Tuple left, java.lang.Object right, java.lang.Object prefix, IOAVState state) Get the value of an attribute from an object or tuple.
boolean	isAffected(int tupleindex, OAVAttributeType attr) Test if a constraint evaluator is affected from a change of a certain attribute.

Method Detail

getValue

java.lang.Object getValue(Tuple left,
                          java.lang.Object right,
                          java.lang.Object prefix,
                          IOAVState state)

Get the value of an attribute from an object or tuple.

Parameters:

left - The left input tuple.

right - The right input object.

prefix - The prefix input object (last value from previous extractor in a chain).

state - The working memory.

isAffected

boolean isAffected(int tupleindex,
                   OAVAttributeType attr)

Test if a constraint evaluator is affected from a change of a certain attribute.

Parameters:

tupleindex - The tuple index (-1 for object).

attr - The attribute.

Returns:

True, if affected.

getRelevantAttributes

AttributeSet getRelevantAttributes()

Get the set of relevant attribute types.

Returns:

The relevant attribute types.

getIndirectAttributes

AttributeSet getIndirectAttributes()

Get the set of indirect attribute types. I.e. attributes of objects, which are not part of an object conditions (e.g. for chained extractors)

Returns:

The relevant attribute types.