Package de.gebit.integrity.operations.standard.operands

Class OperatorNode<LEFT,RIGHT>

java.lang.Object

de.gebit.integrity.operations.standard.operands.OperatorNode<LEFT,RIGHT>

Type Parameters:

LEFT - the left argument

RIGHT - the right argument

Direct Known Subclasses:

AdditionNode, DivisionNode, ModuloNode, MultiplicationNode, StringConcatenationNode, SubtractionNode

public abstract class OperatorNode<LEFT,RIGHT>
extends Object

Abstract base class for operator nodes. An operator node is a node in the AST built to evaluate StandardOperations.

Author:

Rene Schneider - initial API and implementation

Constructor Summary

Constructors

Constructor	Description
OperatorNode(Operation anOperation, Object aLeftOperand, Object aRightOperand)	Creates an instance.

Method Summary

Modifier and Type	Method	Description
Object	evaluate()	Evaluates the whole node.
protected abstract Object	evaluateInternal(LEFT aLeftOperand, RIGHT aRightOperand)	Must be implemented by subclasses to implement the actual evaluation of this node.
protected Object	getEvaluatedLeftOperand()	Returns the left operand in an evaluated version.
protected Object	getEvaluatedRightOperand()	Returns the right operand in an evaluated version.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OperatorNode

public OperatorNode(Operation anOperation,
                    Object aLeftOperand,
                    Object aRightOperand)

Creates an instance.

Parameters:

aLeftOperand - the left operand

aRightOperand - the right operand

Method Detail

getEvaluatedLeftOperand

protected Object getEvaluatedLeftOperand()
                                  throws UnexecutableException

Returns the left operand in an evaluated version.

Returns:

the result of the evaluation

Throws:

UnexecutableException

getEvaluatedRightOperand

protected Object getEvaluatedRightOperand()
                                   throws UnexecutableException

Returns the right operand in an evaluated version.

Returns:

the result of the evaluation

Throws:

UnexecutableException

evaluate

public Object evaluate()
                throws UnexecutableException

Evaluates the whole node.

Returns:

the evaluation result

Throws:

UnexecutableException

evaluateInternal

protected abstract Object evaluateInternal(LEFT aLeftOperand,
                                           RIGHT aRightOperand)
                                    throws UnexecutableException

Must be implemented by subclasses to implement the actual evaluation of this node. It will get evaluated and converted operands and needs to return the result of the evaluation.

Parameters:

aLeftOperand - the evaluated left operand

aRightOperand - the evaluated right operand

Returns:

the result of the evaluation

Throws:

UnexecutableException