Description

The ExpressionCalculator class allows you to create an expression calculator.

Constructors

Constructs this class and a assigns expression string.

public ExpressionCalculator(String expression) throws Exception

• expression: String - expression string.

Properties

autoVariables

Gets the flag to turn on auto-creation of variables for a specified expression.

public boolean _autoVariables = true

Instance methods

getExpression

Gets an expression.

public String getExpression()

• returns: String - expression

setExpression

Sets an expression.

public void setExpression(String value) throws Exception

• value: String - expression.

getOriginalTokens

Gets an original tokens.

public List getOriginalTokens()

• returns: List - list of original tokens.

setOriginalTokens

Sets an original token.

public void setOriginalTokens(List value) throws SyntaxException

• value: List - list of original tokens.

getAutoVariables

Gets the flag to turn on auto creation of variables for specified expression.

public boolean getAutoVariables()

• returns: boolean - flag .

setAutoVariables

Sets the flag to turn on auto creation of variables for specified expression.

public void setExpression(String value) throws Exception

• value: String - flag.

getVariantOperations

Gets the manager for operations on variant values.

public IVariantOperations getVariantOperations()

• returns: IVariantOperations - manager for operations on variant values

setVariantOperations

Sets the manager for operations on variant values.

public void setVariantOperations(IVariantOperations value)

• value: IVariantOperations - manager for operations on variant values.

getDefaultVariables

Gets a list with default variables.

public IVariableCollection getDefaultVariables() {

• returns: IVariantOperations - list with default variables.

getDefaultFunctions

Gets a list with default functions.

public IFunctionCollection getDefaultFunctions()

• value: IFunctionCollection - list with default functions.

getInitialTokens

Gets a list of original expression tokens.

public List getInitialTokens()

• returns: ist - list of original expression tokens.

getResultTokens

Gets a list of processed expression tokens.

public List getResultTokens()

• value: List - list of processed expression tokens.

clear

Cleans up this calculator from all data.

public void clear()

createVariables

Cleans up this calculator from all data.

public void createVariables(IVariantOperations variables)

• variables: IVariantOperations - list of variables to be populated.

evaluate

Evaluates this expression using default variables and functions.

public Variant evaluate() throws Exception

• returns: Variant - evaluation result.

evaluateWithVariables

Evaluates this expression using specified variables.

public Variant evaluateWithVariables(IVariableCollection variables) throws Exception

• variables: IVariableCollection - list of variables.
• returns: Variant - evaluation result.

evaluateWithVariablesAndFunctions

Evaluates this expression using specified variables and functions.

public Variant evaluateWithVariablesAndFunctions(IVariableCollection variables, IFunctionCollection functions) throws Exception

• variables: IVariableCollection - list of variables.
• functions: IFunctionCollection - list of functions
• returns: Variant - evaluation result.