sjm.imperative
Class AssignmentCommand

java.lang.Object
  |
  +--sjm.imperative.Command
        |
        +--sjm.imperative.AssignmentCommand

public class AssignmentCommand

extends Command

This class holds an sjm.engine.Evaluation object, and executes it upon receiving an execute command.

Field Summary

protected Evaluation

evaluation

Constructor Summary

AssignmentCommand(Evaluation evaluation)
Construct an Assignment command from the given Evaluation.

Method Summary

void	execute() Execute the assignment.
java.lang.String	toString() Returns a string representation of this command.

Methods inherited from class java.lang.Object

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

Field Detail

evaluation

protected Evaluation evaluation

Constructor Detail

AssignmentCommand

public AssignmentCommand(Evaluation evaluation)

Construct an Assignment command from the given Evaluation.

Method Detail

execute

public void execute()

Execute the assignment. Evaluate the evaluation's second term, and retrieve the variable from the evaluation's first term. Unbind the variable, so that it can unify, and unify the variable with the second term.

Overrides:

execute in class Command

toString

public java.lang.String toString()

Returns a string representation of this command.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this command