net.objecthunter.exp4j

Class ExpressionBuilder

java.lang.Object

net.objecthunter.exp4j.ExpressionBuilder

public class ExpressionBuilder
extends Object

Factory class for Expression instances. This class is the main API entrypoint. Users should create new Expression instances using this factory class.

Constructor Summary

Constructors

Constructor and Description
ExpressionBuilder(String expression) Create a new ExpressionBuilder instance and initialize it with a given expression string.

Method Summary

Methods

Modifier and Type	Method and Description
Expression	build() Build the Expression instance using the custom operators and functions set.
ExpressionBuilder	function(Function function) Add a Function implementation available for use in the expression
ExpressionBuilder	functions(Function... functions) Add multiple Function implementations available for use in the expression
ExpressionBuilder	functions(List<Function> functions) Add multiple Function implementations available for use in the expression
ExpressionBuilder	operator(List<Operator> operators) Add multiple Operator implementations which should be available for use in the expression
ExpressionBuilder	operator(Operator... operators) Add multiple Operator implementations which should be available for use in the expression
ExpressionBuilder	operator(Operator operator) Add an Operator which should be available for use in the expression
ExpressionBuilder	variable(String variableName)
ExpressionBuilder	variables(Set<String> variableNames)
ExpressionBuilder	variables(String... variableNames)

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionBuilder

public ExpressionBuilder(String expression)

Create a new ExpressionBuilder instance and initialize it with a given expression string.

Parameters:

expression - the expression to be parsed

Method Detail

function

public ExpressionBuilder function(Function function)

Add a Function implementation available for use in the expression

Parameters:

function - the custom Function implementation that should be available for use in the expression.

Returns:

the ExpressionBuilder instance

functions

public ExpressionBuilder functions(Function... functions)

Add multiple Function implementations available for use in the expression

Parameters:

functions - the custom Function implementations

Returns:

the ExpressionBuilder instance

functions

public ExpressionBuilder functions(List<Function> functions)

Add multiple Function implementations available for use in the expression

Parameters:

functions - A List of custom Function implementations

Returns:

the ExpressionBuilder instance

variables

public ExpressionBuilder variables(Set<String> variableNames)

variables

public ExpressionBuilder variables(String... variableNames)

variable

public ExpressionBuilder variable(String variableName)

operator

public ExpressionBuilder operator(Operator operator)

Add an Operator which should be available for use in the expression

Parameters:

operator - the custom Operator to add

Returns:

the ExpressionBuilder instance

operator

public ExpressionBuilder operator(Operator... operators)

Add multiple Operator implementations which should be available for use in the expression

Parameters:

operators - the set of custom Operator implementations to add

Returns:

the ExpressionBuilder instance

operator

public ExpressionBuilder operator(List<Operator> operators)

Add multiple Operator implementations which should be available for use in the expression

Parameters:

operators - the List of custom Operator implementations to add

Returns:

the ExpressionBuilder instance

build

public Expression build()

Build the Expression instance using the custom operators and functions set.

Returns:

an Expression instance which can be used to evaluate the result of the expression