import java.util.*;

public class Wire
{
    public Wire()
    {
	this("");
    }
    
    public Wire(String name)
    {
	mySignal = false;
	myName = name;
	myGates = new Vector();
	myNumber = ourCount++;
    }

    public boolean getSignal()
    {
	return mySignal;
    }
    
    public int  number()
    {
	return myNumber;
    }
    
    public String toString()
    {
	return myName + " (wire " + myNumber + ")";
    }
    
    public void setSignal(boolean signal)
    {
	if (signal != mySignal) {
	    mySignal = signal;
	    int k;
	    for(k=0; k < myGates.size(); k++) {
		((Gate) myGates.get(k)).act();
	    }
	}
    }
    
    public void addGate(Gate g)
    {
	myGates.add(g);
	g.act();
    }
    
    public void removeGate(Gate g)
    {
	myGates.remove(g);
    }

    private List     myGates;
    private boolean  mySignal;
    private String   myName;
    private int      myNumber;
    private static int ourCount;
}