frysk.rt
Class DisplayValue

java.lang.Object
  frysk.rt.DisplayValue

Direct Known Subclasses:

UpdatingDisplayValue

 class DisplayValue
extends Object

The DisplayValue class is an intermediary between a Variable object and anything that wishes to keep track of Variables. A Display is responsible for keeping track of when a Variable is in or out of scope, and reloading the variable if it is available upon a process becoming blocked. It is also responsible for keeping track of the Variable should it switch from being in memory to being in a register

Field Summary

protected FrameIdentifier	frameIdentifier
protected Task	myTask
protected Value	myVar
protected int	num
protected String	varLabel

Constructor Summary

DisplayValue(String name, Task task, FrameIdentifier fIdent, int id)
Creates a new DisplayValue object encompassing a variable from the provided Task

Method Summary

FrameIdentifier	getFrameIdentifier()
int	getId()
String	getName()
Task	getTask()
Value	getValue()
boolean	isAvailable()
void	refresh() Updates the display to refect the new variable value

Methods inherited from class java.lang.Object

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

Field Detail

varLabel

protected String varLabel

myTask

protected Task myTask

frameIdentifier

protected FrameIdentifier frameIdentifier

myVar

protected Value myVar

num

protected int num

Constructor Detail

DisplayValue

public DisplayValue(String name,
                    Task task,
                    FrameIdentifier fIdent,
                    int id)

Creates a new DisplayValue object encompassing a variable from the provided Task

Parameters:

name - The name of the value to encapsulate

task - The task to fetch updates from

fIdent - The FrameIdentifier corresponding to the frame that the variable should be looked for in.

id - The unique identifier for this display

Method Detail

isAvailable

public boolean isAvailable()

Returns:

true iff the variable represented by this Display is in scope

refresh

public void refresh()

Updates the display to refect the new variable value

getValue

public Value getValue()

Returns:

The Value object encapsulated by this Display.

getFrameIdentifier

public FrameIdentifier getFrameIdentifier()

getTask

public Task getTask()

getName

public String getName()

getId

public int getId()