com.healthmarketscience.jackcess.expr

Interface Function

All Known Implementing Classes:

FunctionSupport.BaseFunction, FunctionSupport.Func0, FunctionSupport.Func1, FunctionSupport.Func1NullIsNull, FunctionSupport.Func2, FunctionSupport.Func3, FunctionSupport.FuncVar, FunctionSupport.StringFuncWrapper

public interface Function

A Function provides an invokable handle to external functionality to an expression.

Author:

James Ahlborn

Method Summary

Modifier and Type	Method and Description
Value	eval(EvalContext ctx, Value... params) Evaluates this function within the given context with the given parameters.
String	getName()
boolean	isPure()

Method Detail

getName

String getName()

Returns:

the name of this function

eval

Value eval(EvalContext ctx,
           Value... params)

Evaluates this function within the given context with the given parameters.

Returns:

the result of the function evaluation

isPure

boolean isPure()

Returns:

true if this function is a "pure" function, false otherwise. A pure function will always return the same result for a given set of parameters and has no side effects.