Class LogicGate

java.lang.Object
  |
  +--LogicGate

Direct Known Subclasses:

LogicAnd, LogicInput, LogicNand, LogicNode, LogicNor, LogicNot, LogicOr, LogicXnor, LogicXor

public abstract class LogicGate

extends java.lang.Object

Field Summary

protected boolean	calculated True if the gate has been calculated since the last time it was reset
protected GraphicGate	equivGate reference to the equivalent graphics gate
protected int	gateType Stores the type of Gate.
protected int	id the id number of the gate.
protected LogicGate	inputOne reference to gates providing input
protected LogicGate	inputTwo
protected boolean	lastOutputValue
protected java.util.Vector	outputs vector of all the gates output to
protected boolean	outputValue holds the output of the gate
protected boolean	sequential If true the gate is sequential, that is that it is in a loop from its output to its input.

Constructor Summary

(package private)	LogicGate() basic constructor will not be used
(package private)	LogicGate(java.lang.Object linkGate) Constructor that will always be used, it takes a graphical gate as its only argument which it will use as its equivalent gate

Method Summary

void	addInput(LogicGate newIn) Add an input to the gate
void	addOutput(LogicGate newOut) add a reference to a gate to output to
void	calcOutputs() This is basically a helper function for the extended classes when they calculate.
(package private) void	calculate() defined in each extended class will calculate the gate's output value
(package private) void	determineSequential(LogicGate checkGate) This method determines whether the gate sent to it as checkGate is is part of an input output loop which would mean that it is a sequential gate.
(package private) abstract void	evaluate()
boolean	getOutputValue()
(package private) void	printInfo()
void	removeInput(LogicGate oldIn) removes oldIn from the gate
void	removeOutput(LogicGate oldOut) remove a gate from the outputs of a gate.
void	resetCalculated() resets the calculated variable to false
boolean	returnOutput(LogicGate callingGate) returns the last output the gate calculated.
void	unlinkGates() unlinkGate takes all the gates that link to the gate as an input or an output and removes those links

Methods inherited from class java.lang.Object

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

Field Detail

id

protected int id

the id number of the gate. It will correspond to the id of graphical gate that is the equivalent to this logical gate.

outputValue

protected boolean outputValue

holds the output of the gate

lastOutputValue

protected boolean lastOutputValue

equivGate

protected GraphicGate equivGate

reference to the equivalent graphics gate

outputs

protected java.util.Vector outputs

vector of all the gates output to

inputOne

protected LogicGate inputOne

reference to gates providing input

inputTwo

protected LogicGate inputTwo

calculated

protected boolean calculated

True if the gate has been calculated since the last time it was reset

gateType

protected int gateType

Stores the type of Gate. It uses the values given in the GraphicalGate class

sequential

protected boolean sequential

If true the gate is sequential, that is that it is in a loop from its output to its input.

Constructor Detail

LogicGate

LogicGate()

basic constructor will not be used

LogicGate

LogicGate(java.lang.Object linkGate)

Constructor that will always be used, it takes a graphical gate as its only argument which it will use as its equivalent gate

Method Detail

calculate

void calculate()

defined in each extended class will calculate the gate's output value

evaluate

abstract void evaluate()

addOutput

public void addOutput(LogicGate newOut)

add a reference to a gate to output to

removeOutput

public void removeOutput(LogicGate oldOut)

remove a gate from the outputs of a gate. This method does not ensure that the gate referenced by oldOut has had this gate removed from its inputs

addInput

public void addInput(LogicGate newIn)

Add an input to the gate

removeInput

public void removeInput(LogicGate oldIn)

removes oldIn from the gate

unlinkGates

public void unlinkGates()

unlinkGate takes all the gates that link to the gate as an input or an output and removes those links

returnOutput

public boolean returnOutput(LogicGate callingGate)

returns the last output the gate calculated. I made this before I knew about the getWhatever convention and it's a fair bit of code internally so I just left it and added the get one too

getOutputValue

public boolean getOutputValue()

resetCalculated

public void resetCalculated()
                     throws calculateException

resets the calculated variable to false

calcOutputs

public void calcOutputs()

This is basically a helper function for the extended classes when they calculate. It will call calculate on all of the gate's outputs so that I don't have to write that out individually for each gate.

determineSequential

void determineSequential(LogicGate checkGate)

This method determines whether the gate sent to it as checkGate is is part of an input output loop which would mean that it is a sequential gate. I know that it is really ugly to have a line that wraps in the code but I couldn't see a good way to deal with it.

printInfo

void printInfo()