org.hecl

Class Operator

java.lang.Object

org.hecl.Operator

All Implemented Interfaces:

Command

Direct Known Subclasses:

Base64Cmd, FileCmds, HttpCmd, MathCmds

public abstract class Operator
extends java.lang.Object
implements Command

The Operator class implements a number of features that are used in the creation of groups of commands, such as those found in InterpCmds, ListCmds, and so on.

Method Summary

Modifier and Type	Method and Description
Thing	cmdCode(Interp interp, Thing[] argv) The cmdCode method dispatches to the actual code via the operate method and cmdcode argument.
abstract Thing	operate(int cmdcode, Interp interp, Thing[] argv) The operate method dispatches to the actual code.

Methods inherited from class java.lang.Object

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

Method Detail

cmdCode

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

The cmdCode method dispatches to the actual code via the operate method and cmdcode argument.

Specified by:

cmdCode in interface Command

Parameters:

interp - an Interp value

argv - a Thing[] value

Returns:

The computed Thing, or null when no value has been computed.

Throws:

HeclException - if an error occurs

operate

public abstract Thing operate(int cmdcode,
                              Interp interp,
                              Thing[] argv)
                       throws HeclException

The operate method dispatches to the actual code.

Parameters:

cmdcode - an int value

interp - an Interp value

argv - a Thing[] value

Returns:

a Thing value, or null when no value has been

Throws:

HeclException - if an error occurs