org.mariuszgromada.math.mxparser

Class Expression

java.lang.Object

org.mariuszgromada.math.mxparser.Expression

public class Expression
extends Object

Expression - base class for real expressions definition. Examples:

• '1+2'
• 'sin(x)+1'
• 'asin(3*x)^10-log(4,8)'
• in general 'f(x1,x2,...,xn)' where x1,...,xn are real arguments

Class provides easy way to define multivariate arithmetic expression.

Version:

4.0.0

Author:

Mariusz Gromada
mariuszgromada.org@gmail.com
MathSpace.pl
MathParser.org - mXparser project page
mXparser on GitHub
mXparser on SourceForge
mXparser on Bitbucket
mXparser on CodePlex
Janet Sudoku - project web page
Janet Sudoku on GitHub
Janet Sudoku on CodePlex
Janet Sudoku on SourceForge
Janet Sudoku on BitBucket

See Also:

Argument, RecursiveArgument, Constant, Function

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	NO_SYNTAX_ERRORS Status of the Expression syntax
static boolean	SYNTAX_ERROR_OR_STATUS_UNKNOWN

Constructor Summary

Constructors

Constructor and Description
Expression(PrimitiveElement... elements) Default constructor - empty expression
Expression(String expressionString, PrimitiveElement... elements) Constructor - creates new expression from expression string.

Method Summary

Methods

Modifier and Type	Method and Description
void	addArguments(Argument... arguments) Adds arguments (variadic) to the expression definition.
void	addConstants(ArrayList<Constant> constantsList) Adds constants to the expression definition.
void	addConstants(Constant... constants) Adds constants (variadic parameters) to the expression definition.
void	addDefinitions(PrimitiveElement... elements) Adds user defined elements (such as: Arguments, Constants, Functions) to the expressions.
void	addFunctions(Function... functions) Adds functions (variadic parameters) to the expression definition.
double	calculate() Calculates the expression value
boolean	checkLexSyntax() Checks syntax of the expression string.
boolean	checkSyntax() Checks syntax of the expression string.
void	clearDescription() Clears expression description
void	clearExpressionString() Clears expression string
protected Expression	clone() Expression cloning.
void	defineArgument(String argumentName, double argumentValue) Enables to define the argument (associated with the expression) based on the argument name and the argument value.
void	defineArguments(String... argumentsNames) Enables to define the arguments (associated with the expression) based on the given arguments names.
void	defineConstant(String constantName, double constantValue) Enables to define the constant (associated with the expression) based on the constant name and constant value.
void	defineFunction(String functionName, String functionExpressionString, String... argumentsNames) Enables to define the function (associated with the expression) based on the function name, function expression string and arguments names (variadic parameters).
Argument	getArgument(int argumentIndex) Gets argument from the expression.
Argument	getArgument(String argumentName) Gets argument from the expression.
int	getArgumentIndex(String argumentName) Gets argument index from the expression.
int	getArgumentsNumber() Gets number of arguments associated with the expression.
double	getArgumentValue(String argumentName) Gets argument vale.
double	getComputingTime() Gets computing time.
Constant	getConstant(int constantIndex) Gets constant associated with the expression.
Constant	getConstant(String constantName) Gets constant associated with the expression.
int	getConstantIndex(String constantName) Gets constant index associated with the expression.
int	getConstantsNumber() Gets number of constants associated with the expression.
ArrayList<Token>	getCopyOfInitialTokens() Tokenizes expression string and returns tokens list, including: string, type, level.
String	getDescription() Gets expression description.
String	getErrorMessage() Method return error message after calling checkSyntax() method or calculate().
String	getExpressionString() Returns expression string
Function	getFunction(int functionIndex) Gets function associated with the expression.
Function	getFunction(String functionName) Gets function associated with the expression.
int	getFunctionIndex(String functionName) Gets index of function associated with the expression.
int	getFunctionsNumber() Gets number of functions associated with the expression.
String	getHelp() Gets help content.
String	getHelp(String word) Searching help content.
boolean	getRecursiveMode() Gets recursive mode status
boolean	getSyntaxStatus() Gets syntax status of the expression.
boolean	getVerboseMode() Returns verbose mode status.
void	removeAllArguments() Removes all arguments associated with the expression.
void	removeAllConstants() Removes all constants associated with the expression
void	removeAllFunctions() Removes all functions associated with the expression.
void	removeArguments(Argument... arguments) Removes first occurrences of the arguments associated with the expression.
void	removeArguments(String... argumentsNames) Removes first occurrences of the arguments associated with the expression.
void	removeConstants(Constant... constants) Removes first occurrences of the constants associated with the expression
void	removeConstants(String... constantsNames) Removes first occurrences of the constants associated with the expression.
void	removeDefinitions(PrimitiveElement... elements) Removes user defined elements (such as: Arguments, Constants, Functions) to the expressions.
void	removeFunctions(Function... functions) Removes first occurrences of the functions associated with the expression.
void	removeFunctions(String... functionsNames) Removes first occurrences of the functions associated with the expression.
void	setArgumentValue(String argumentName, double argumentValue) Sets argument value.
void	setDescription(String description) Sets expression description.
void	setExpressionString(String expressionString) Sets (modifies expression) expression string.
void	setSilentMode() Disables verbose mode (default silent mode).
void	setVerboseMode() Enables verbose mode.

Methods inherited from class java.lang.Object

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

Field Detail

NO_SYNTAX_ERRORS

public static final boolean NO_SYNTAX_ERRORS

Status of the Expression syntax

See Also:

Constant Field Values

SYNTAX_ERROR_OR_STATUS_UNKNOWN

public static final boolean SYNTAX_ERROR_OR_STATUS_UNKNOWN

See Also:

Constant Field Values

Constructor Detail

Expression

public Expression(PrimitiveElement... elements)

Default constructor - empty expression

Parameters:

elements - Optional elements list (variadic - comma separated) of types: Argument, Constant, Function

See Also:

PrimitiveElement

Expression

public Expression(String expressionString,
          PrimitiveElement... elements)

Constructor - creates new expression from expression string.

Parameters:

expressionString - definition of the expression

elements - Optional elements list (variadic - comma separated) of types: Argument, Constant, Function

See Also:

PrimitiveElement

Method Detail

getErrorMessage

public String getErrorMessage()

Method return error message after calling checkSyntax() method or calculate().

Returns:

Error message as string.

getSyntaxStatus

public boolean getSyntaxStatus()

Gets syntax status of the expression.

Returns:

true if there are no syntax errors, false when syntax error was found or syntax status is unknown

setExpressionString

public void setExpressionString(String expressionString)

Sets (modifies expression) expression string.

Parameters:

expressionString - the expression string

getExpressionString

public String getExpressionString()

Returns expression string

Returns:

Expression string definition.

clearExpressionString

public void clearExpressionString()

Clears expression string

setDescription

public void setDescription(String description)

Sets expression description.

Parameters:

description - the description string

getDescription

public String getDescription()

Gets expression description.

Returns:

String description.

clearDescription

public void clearDescription()

Clears expression description

setVerboseMode

public void setVerboseMode()

Enables verbose mode.

setSilentMode

public void setSilentMode()

Disables verbose mode (default silent mode).

getVerboseMode

public boolean getVerboseMode()

Returns verbose mode status.

Returns:

true if verbose mode is on, otherwise returns false.

getRecursiveMode

public boolean getRecursiveMode()

Gets recursive mode status

Returns:

true if recursive mode is enabled, otherwise returns false.

getComputingTime

public double getComputingTime()

Gets computing time.

Returns:

computing time in seconds.

addDefinitions

public void addDefinitions(PrimitiveElement... elements)

Adds user defined elements (such as: Arguments, Constants, Functions) to the expressions.

Parameters:

elements - Elements list (variadic), where Argument, Constant, Function extend the same class PrimitiveElement

See Also:

PrimitiveElement

removeDefinitions

public void removeDefinitions(PrimitiveElement... elements)

Removes user defined elements (such as: Arguments, Constants, Functions) to the expressions.

Parameters:

elements - Elements list (variadic), where Argument, Constant, Function extend the same class PrimitiveElement

See Also:

PrimitiveElement

addArguments

public void addArguments(Argument... arguments)

Adds arguments (variadic) to the expression definition.

Parameters:

arguments - the arguments list (comma separated list)

See Also:

Argument, RecursiveArgument

defineArguments

public void defineArguments(String... argumentsNames)

Enables to define the arguments (associated with the expression) based on the given arguments names.

Parameters:

argumentsNames - the arguments names (variadic) comma separated list

See Also:

Argument, RecursiveArgument

defineArgument

public void defineArgument(String argumentName,
                  double argumentValue)

Enables to define the argument (associated with the expression) based on the argument name and the argument value.

Parameters:

argumentName - the argument name

argumentValue - the the argument value

See Also:

Argument, RecursiveArgument

getArgumentIndex

public int getArgumentIndex(String argumentName)

Gets argument index from the expression.

Parameters:

argumentName - the argument name

Returns:

The argument index if the argument name was found, otherwise returns Argument.NOT_FOUND

See Also:

Argument, RecursiveArgument

getArgument

public Argument getArgument(String argumentName)

Gets argument from the expression.

Parameters:

argumentName - the argument name

Returns:

The argument if the argument name was found, otherwise returns null.

See Also:

Argument, RecursiveArgument

getArgument

public Argument getArgument(int argumentIndex)

Gets argument from the expression.

Parameters:

argumentIndex - the argument index

Returns:

Argument if the argument index is between 0 and the last available argument index (getArgumentsNumber()-1), otherwise returns null.

See Also:

Argument, RecursiveArgument

getArgumentsNumber

public int getArgumentsNumber()

Gets number of arguments associated with the expression.

Returns:

The number of arguments (int >= 0)

See Also:

Argument, RecursiveArgument

setArgumentValue

public void setArgumentValue(String argumentName,
                    double argumentValue)

Sets argument value.

Parameters:

argumentName - the argument name

argumentValue - the argument value

getArgumentValue

public double getArgumentValue(String argumentName)

Gets argument vale.

Parameters:

argumentName - the argument name

Returns:

Argument value if argument name was found, otherwise return Double.NaN.

removeArguments

public void removeArguments(String... argumentsNames)

Removes first occurrences of the arguments associated with the expression.

Parameters:

argumentsNames - the arguments names (variadic parameters) comma separated list

See Also:

Argument, RecursiveArgument

removeArguments

public void removeArguments(Argument... arguments)

Removes first occurrences of the arguments associated with the expression.

Parameters:

arguments - the arguments (variadic parameters) comma separated list

See Also:

Argument, RecursiveArgument

removeAllArguments

public void removeAllArguments()

Removes all arguments associated with the expression.

See Also:

Argument, RecursiveArgument

addConstants

public void addConstants(Constant... constants)

Adds constants (variadic parameters) to the expression definition.

Parameters:

constants - the constants (comma separated list)

See Also:

Constant

addConstants

public void addConstants(ArrayList<Constant> constantsList)

Adds constants to the expression definition.

Parameters:

constantsList - the list of constants

See Also:

Constant

defineConstant

public void defineConstant(String constantName,
                  double constantValue)

Enables to define the constant (associated with the expression) based on the constant name and constant value.

Parameters:

constantName - the constant name

constantValue - the constant value

See Also:

Constant

getConstantIndex

public int getConstantIndex(String constantName)

Gets constant index associated with the expression.

Parameters:

constantName - the constant name

Returns:

Constant index if constant name was found, otherwise return Constant.NOT_FOUND.

See Also:

Constant

getConstant

public Constant getConstant(String constantName)

Gets constant associated with the expression.

Parameters:

constantName - the constant name

Returns:

Constant if constant name was found, otherwise return null.

See Also:

Constant

getConstant

public Constant getConstant(int constantIndex)

Gets constant associated with the expression.

Parameters:

constantIndex - the constant index

Returns:

Constant if the constantIndex is between 0 and the last available constant index (getConstantsNumber() - 1), otherwise it returns null.

See Also:

Constant

getConstantsNumber

public int getConstantsNumber()

Gets number of constants associated with the expression.

Returns:

number of constants (int >= 0)

See Also:

Constant

removeConstants

public void removeConstants(String... constantsNames)

Removes first occurrences of the constants associated with the expression.

Parameters:

constantsNames - the constants names (variadic parameters) comma separated list

See Also:

Constant

removeConstants

public void removeConstants(Constant... constants)

Removes first occurrences of the constants associated with the expression

Parameters:

constants - the constants (variadic parameters) comma separated list

See Also:

Constant

removeAllConstants

public void removeAllConstants()

Removes all constants associated with the expression

See Also:

Constant

addFunctions

public void addFunctions(Function... functions)

Adds functions (variadic parameters) to the expression definition.

Parameters:

functions - the functions (variadic parameters) comma separated list

See Also:

Function

defineFunction

public void defineFunction(String functionName,
                  String functionExpressionString,
                  String... argumentsNames)

Enables to define the function (associated with the expression) based on the function name, function expression string and arguments names (variadic parameters).

Parameters:

functionName - the function name

functionExpressionString - the expression string

argumentsNames - the function arguments names (variadic parameters) comma separated list

See Also:

Function

getFunctionIndex

public int getFunctionIndex(String functionName)

Gets index of function associated with the expression.

Parameters:

functionName - the function name

Returns:

Function index if function name was found, otherwise returns Function.NOT_FOUND

See Also:

Function

getFunction

public Function getFunction(String functionName)

Gets function associated with the expression.

Parameters:

functionName - the function name

Returns:

Function if function name was found, otherwise returns null.

See Also:

Function

getFunction

public Function getFunction(int functionIndex)

Gets function associated with the expression.

Parameters:

functionIndex - the function index

Returns:

Function if function index is between 0 and the last available function index (getFunctionsNumber()-1), otherwise returns null.

See Also:

Function

getFunctionsNumber

public int getFunctionsNumber()

Gets number of functions associated with the expression.

Returns:

number of functions (int >= 0)

See Also:

Function

removeFunctions

public void removeFunctions(String... functionsNames)

Removes first occurrences of the functions associated with the expression.

Parameters:

functionsNames - the functions names (variadic parameters) comma separated list

See Also:

Function

removeFunctions

public void removeFunctions(Function... functions)

Removes first occurrences of the functions associated with the expression.

Parameters:

functions - the functions (variadic parameters) comma separated list.

See Also:

Function

removeAllFunctions

public void removeAllFunctions()

Removes all functions associated with the expression.

See Also:

Function

checkLexSyntax

public boolean checkLexSyntax()

Checks syntax of the expression string.

Returns:

true if syntax is ok

checkSyntax

public boolean checkSyntax()

Checks syntax of the expression string.

Returns:

true if syntax is ok

calculate

public double calculate()

Calculates the expression value

Returns:

The expression value if syntax was ok, otherwise returns Double.NaN.

getCopyOfInitialTokens

public ArrayList<Token> getCopyOfInitialTokens()

Tokenizes expression string and returns tokens list, including: string, type, level.

Returns:

Copy of initial tokens.

See Also:

Token, mXparser.consolePrintTokens(ArrayList)

getHelp

public String getHelp()

Gets help content.

Returns:

The help content.

getHelp

public String getHelp(String word)

Searching help content.

Parameters:

word - searching key word

Returns:

The help content.

clone

protected Expression clone()

Expression cloning.

Overrides:

clone in class Object