Package com.ezylang.evalex.config

Interface OperatorDictionaryIfc

All Known Implementing Classes:

MapBasedOperatorDictionary

public interface OperatorDictionaryIfc

An operator dictionary holds all the operators, that can be used in an expression.
The default implementation is the MapBasedOperatorDictionary.

Method Summary

Modifier and Type	Method	Description
void	addOperator(java.lang.String operatorString, OperatorIfc operator)	Allows to add an operator to the dictionary.
OperatorIfc	getInfixOperator(java.lang.String operatorString)	Get the operator definition for an infix operator name.
OperatorIfc	getPostfixOperator(java.lang.String operatorString)	Get the operator definition for a postfix operator name.
OperatorIfc	getPrefixOperator(java.lang.String operatorString)	Get the operator definition for a prefix operator name.
default boolean	hasInfixOperator(java.lang.String operatorString)	Check if the dictionary has an infix operator with that name.
default boolean	hasPostfixOperator(java.lang.String operatorString)	Check if the dictionary has a postfix operator with that name.
default boolean	hasPrefixOperator(java.lang.String operatorString)	Check if the dictionary has a prefix operator with that name.

Method Detail

addOperator

void addOperator(java.lang.String operatorString,
                 OperatorIfc operator)

Allows to add an operator to the dictionary. Implementation is optional, if you have a fixed set of operators, this method can throw an exception.

Parameters:

operatorString - The operator name.

operator - The operator implementation.

hasPrefixOperator

default boolean hasPrefixOperator(java.lang.String operatorString)

Check if the dictionary has a prefix operator with that name.

Parameters:

operatorString - The operator name to look for.

Returns:

true if an operator was found or false if not.

hasPostfixOperator

default boolean hasPostfixOperator(java.lang.String operatorString)

Check if the dictionary has a postfix operator with that name.

Parameters:

operatorString - The operator name to look for.

Returns:

true if an operator was found or false if not.

hasInfixOperator

default boolean hasInfixOperator(java.lang.String operatorString)

Check if the dictionary has an infix operator with that name.

Parameters:

operatorString - The operator name to look for.

Returns:

true if an operator was found or false if not.

getPrefixOperator

OperatorIfc getPrefixOperator(java.lang.String operatorString)

Get the operator definition for a prefix operator name.

Parameters:

operatorString - The name of the operator.

Returns:

The operator definition or null if no operator was found.

getPostfixOperator

OperatorIfc getPostfixOperator(java.lang.String operatorString)

Get the operator definition for a postfix operator name.

Parameters:

operatorString - The name of the operator.

Returns:

The operator definition or null if no operator was found.

getInfixOperator

OperatorIfc getInfixOperator(java.lang.String operatorString)

Get the operator definition for an infix operator name.

Parameters:

operatorString - The name of the operator.

Returns:

The operator definition or null if no operator was found.