Package visad.formula

Provides an interface for automatically evaluating formulas based on user-defined operators and functions.

See:
Description

Class Summary

FormulaManager	The FormulaManager class is the gateway into the visad.formula package, a general-purpose formula parser and evaluator.
FormulaUtil	Contains a variety of useful methods related to the visad.formula package.
FormulaVar	Represents a variable.
VMethod	Thing wrapper for java.lang.reflect.Method.
VRealType	Thing wrapper for visad.RealType.

Exception Summary

FormulaException

The type of exception thrown by the formula package.

Package visad.formula Description

Provides an interface for automatically evaluating formulas based on user-defined operators and functions. The VisAD formula package is accessed through the FormulaManager class. The constructor for the FormulaManager class takes user-defined operators, operator precedences, and functions as arguments. Then, variables can be bound to pre-existing ThingReferences with the FormulaManager.createVar() method, bound to formulas with the FormulaManager.assignFormula() method, or set directly with the FormulaManager.setThing() method. The FormulaManager.getThing() method returns the current value of a variable, and the FormulaManager.remove() method deletes a variable. Variables update automatically when the variables upon which they depend change. For an example of usage, see the visad.ss package.