Package jadex.rules.rulesystem.rete.constraints

Class ConstraintEvaluator

java.lang.Object

jadex.rules.rulesystem.rete.constraints.ConstraintEvaluator

All Implemented Interfaces:

IConstraintEvaluator

public class ConstraintEvaluator
extends java.lang.Object
implements IConstraintEvaluator

A constraint evaluator is responsible for evaluating constraints. It operates on an operator and two extractors. It uses the extractors to fetch the values and invokes the operator subsequently with the values.

Field Summary

Fields

Modifier and Type	Field	Description
protected IValueExtractor	extractor1	The value extractor 1.
protected IValueExtractor	extractor2	The value extractor 2.
protected IOperator	operator	The operator.

Constructor Summary

Constructors

Constructor	Description
ConstraintEvaluator(IOperator operator, IValueExtractor extractor1, IValueExtractor extractor2)	Create a new constraint evaluator.

Method Summary

Modifier and Type	Method	Description
boolean	equals(java.lang.Object obj)	Test if the evaluator equals an object.
boolean	evaluate(java.lang.Object right, Tuple left, IOAVState state)	Evaluate the constraints given the right object, left tuple (null for alpha nodes) and the state.
IValueExtractor	getExtractor1()	Get the first value extractor.
IValueExtractor	getExtractor2()	Get the second value extractor.
AttributeSet	getIndirectAttributes()	Get the set of indirect attribute types.
IOperator	getOperator()	Get the operator.
AttributeSet	getRelevantAttributes()	Get the set of relevant attribute types.
int	hashCode()	Get the hash code.
boolean	isAffected(int tupleindex, OAVAttributeType attr)	Test if a constraint evaluator is affected from a change of a certain attribute.
java.lang.String	toString()	Get the string representation.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

operator

protected IOperator operator

The operator.

extractor1

protected IValueExtractor extractor1

The value extractor 1.

extractor2

protected IValueExtractor extractor2

The value extractor 2.

Constructor Detail

ConstraintEvaluator

public ConstraintEvaluator(IOperator operator,
                           IValueExtractor extractor1,
                           IValueExtractor extractor2)

Create a new constraint evaluator.

Parameters:

operator - The operator.

extractor1 - The first extractor.

extractor2 - The second extractor.

Method Detail

evaluate

public boolean evaluate(java.lang.Object right,
                        Tuple left,
                        IOAVState state)

Evaluate the constraints given the right object, left tuple (null for alpha nodes) and the state.

Specified by:

evaluate in interface IConstraintEvaluator

Parameters:

right - The right input object.

left - The left input tuple.

state - The working memory.

isAffected

public boolean isAffected(int tupleindex,
                          OAVAttributeType attr)

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

Specified by:

isAffected in interface IConstraintEvaluator

Parameters:

tupleindex - The tuple index.

attr - The attribute.

Returns:

True, if affected.

getRelevantAttributes

public AttributeSet getRelevantAttributes()

Get the set of relevant attribute types.

Specified by:

getRelevantAttributes in interface IConstraintEvaluator

getIndirectAttributes

public 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)

Specified by:

getIndirectAttributes in interface IConstraintEvaluator

Returns:

The relevant attribute types.

toString

public java.lang.String toString()

Get the string representation.

Overrides:

toString in class java.lang.Object

Returns:

The string representation.

getOperator

public IOperator getOperator()

Get the operator.

getExtractor1

public IValueExtractor getExtractor1()

Get the first value extractor.

getExtractor2

public IValueExtractor getExtractor2()

Get the second value extractor.

hashCode

public int hashCode()

Get the hash code.

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Test if the evaluator equals an object.

Overrides:

equals in class java.lang.Object