com.wewebu.expression.language
Class OwExprUnaryOperator

java.lang.Object
  com.wewebu.expression.language.OwExprOperator
      com.wewebu.expression.language.OwExprUnaryOperator

Direct Known Subclasses:

OwExprArithmeticUnaryOperator, OwExprUnaryNegateOperator

public abstract class OwExprUnaryOperator
extends OwExprOperator

Unary operator class (egg. !boolPropertz , -232.2 ). A single operand operation implementation.

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Constructor Summary

OwExprUnaryOperator(String image_p, OwExprUnaryConversionTable conversionTable_p)
Constructor

Method Summary

OwExprUnaryExpressionType	computeExpressionType(OwExprExpression operand_p) Computes the resulted expression type based on given operand and regresses sub-expression types accordingly
OwExprType	computeType(OwExprType type_p) Type computation method.
OwExprValue	evaluate(OwExprBooleanValue booleanValue_p) Evaluation by visiting with concrete single operand type.
OwExprValue	evaluate(OwExprNumericValue numericValue_p) Evaluation by visiting with concrete single operand type.
OwExprValue	evaluate(OwExprScope scope_p, OwExprExpression expression_p) Unary evaluation method to be called at evaluation time.
Set	getRegressingTypes(Set regressedTypes_p) Returns a set of compatible single operand types ( OwExprTypes ) for a set of given operation result types set.

Methods inherited from class com.wewebu.expression.language.OwExprOperator

toString

Methods inherited from class java.lang.Object

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

Constructor Detail

OwExprUnaryOperator

public OwExprUnaryOperator(String image_p,
                           OwExprUnaryConversionTable conversionTable_p)

Constructor

Parameters:

image_p - literal image (egg. "!" , "-")

conversionTable_p - conversion table to use

Method Detail

evaluate

public final OwExprValue evaluate(OwExprScope scope_p,
                                  OwExprExpression expression_p)
                           throws OwExprEvaluationException

Unary evaluation method to be called at evaluation time. This is the entry point in the operator evaluation visitor sequence.

Parameters:

scope_p - the scope this operation is evaluated on

expression_p - single operand

Returns:

the resulted value as OwExprValue

Throws:

OwExprEvaluationException - if the operation fails for any reason (unsupported operand types , incompatible operands, unimplemented operation or operation failure at evaluation time)

evaluate

public OwExprValue evaluate(OwExprBooleanValue booleanValue_p)
                     throws OwExprEvaluationException

Evaluation by visiting with concrete single operand type.

Parameters:

booleanValue_p -

Returns:

the resulted value as OwExprValue

Throws:

OwExprEvaluationException - if the operation fails for any reason (unsupported operand types , incompatible operands, unimplemented operation or operation failure at evaluation time)

evaluate

public OwExprValue evaluate(OwExprNumericValue numericValue_p)
                     throws OwExprEvaluationException

Evaluation by visiting with concrete single operand type.

Parameters:

numericValue_p -

Returns:

the resulted value as OwExprValue

Throws:

OwExprEvaluationException - if the operation fails for any reason (unsupported operand types , incompatible operands, unimplemented operation or operation failure at evaluation time)

computeType

public final OwExprType computeType(OwExprType type_p)
                             throws OwExprTypeMissmatchException

Type computation method. Delegates type computation to inner conversion table : m_conversionTable

Parameters:

type_p - single operand type

Returns:

the type of the value resulted if two operands of type1 and type2 were combined in this operation

Throws:

OwExprTypeMissmatchException

getRegressingTypes

public final Set getRegressingTypes(Set regressedTypes_p)

Returns a set of compatible single operand types ( OwExprTypes ) for a set of given operation result types set. The returned type set is a subset of all left side operand types that can result invalid types (different from OwExprType.NOTYPE ) for this operator.

Parameters:

regressedTypes_p - the operation result types set

Returns:

a set of compatible left side operand OwExprTypes

computeExpressionType

public final OwExprUnaryExpressionType computeExpressionType(OwExprExpression operand_p)
                                                      throws OwExprTypeMissmatchException

Computes the resulted expression type based on given operand and regresses sub-expression types accordingly

Parameters:

operand_p - single OwExprExpression operand

Returns:

the resulted expression type as OwExprUnaryExpressionType

Throws:

OwExprTypeMissmatchException - if the operator evaluation cannot not be performed due to type incompatibility