sjm.imperative
Class ReadCommand

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

public class ReadCommand

extends Command

This command, when executed, reads in a string and assigns it to a supplied variable.

Field Summary

protected java.io.BufferedReader	reader
protected Variable	variable

Constructor Summary

ReadCommand(Variable variable)
Construct a "read" command to read a value, assigning it to the supplied variable.

ReadCommand(Variable variable, java.io.BufferedReader reader)
Construct a "read" command to read a value from the supplied reader, assigning the value to the supplied variable.

ReadCommand(Variable variable, java.io.InputStream in)
Construct a "read" command to read a value from the supplied input stream, assigning the value to the supplied variable.

Method Summary

void	execute() Read in a string from this object's input reader, and assign the string to this object's variable.
java.lang.String	toString() Returns a string description of this read command.

Methods inherited from class java.lang.Object

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

Field Detail

variable

protected Variable variable

reader

protected java.io.BufferedReader reader

Constructor Detail

ReadCommand

public ReadCommand(Variable variable)

Construct a "read" command to read a value, assigning it to the supplied variable. This constructor sets the command to read from System.in.

Parameters:

Variable - the variable to assign to

ReadCommand

public ReadCommand(Variable variable,
                   java.io.BufferedReader reader)

Construct a "read" command to read a value from the supplied reader, assigning the value to the supplied variable.

Parameters:

Variable - the variable to assign to

BufferedReader - where to read from

ReadCommand

public ReadCommand(Variable variable,
                   java.io.InputStream in)

Construct a "read" command to read a value from the supplied input stream, assigning the value to the supplied variable.

Parameters:

Variable - the variable to assign to

InputStream - where to read from

Method Detail

execute

public void execute()

Read in a string from this object's input reader, and assign the string to this object's variable.

Overrides:

execute in class Command

toString

public java.lang.String toString()

Returns a string description of this read command.

Overrides:

toString in class java.lang.Object

Returns:

a string description of this read command