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org.hecl
Interface Command

All Known Implementing Classes:: AlertCmd, CanvasCmd, ChoiceGroupCmd, CommandCmd, DateFieldCmd, DisplayableCmd, EventCmd, FileCmds, FormCmd, GraphicsCmd, HeclJavaCmd, ImageCmd, ImageItemCmd, ItemCmd, JavaCmd, ListCmd, MathCmds, MidletCmd, NullCmd, Operator, OptionCmd, RMSCmd, ScreenCmd, SettingsCmd, SpacerCmd, StringItemCmd, TextBoxCmd, TextFieldCmd, TickerCmd

public interface Command

The Command interface is the template for all commands implemented in Hecl.

Version:: 1.0
Author:: David N. Welton

Method Summary
`Thing`	`cmdCode(Interp interp, Thing[] argv)` The `cmdCode` method takes an interpreter and an array of Things, performs some calculations, and returns a `Thing` representing the computed value, or `null`.

Method Detail

cmdCode

Thing cmdCode(Interp interp,
              Thing[] argv)
              throws HeclException

The cmdCode method takes an interpreter and an array of Things, performs some calculations, and returns a Thing representing the computed value, or null.

Parameters:: interp - an Interp value; argv - a Thing[] value
Returns:: A Thing representing the computed value, or null.
Throws:: HeclException - if an error occurs