/** Move data down this list. */
public void move() throws Exception {
if (closed()) return;
// Stop each valve that doesn't have a later working on its bins
for (Valve valve : list) valve.stop(); // Throws an exception if one stopped it
// Move data down the list, end to start
Bin.move(last().out(), out); // Take from the last in the list
for (Pair pair : Pair.pairs(list)) // Move data down the list, bottom to top
Bin.move(((Valve) pair.a).out(), ((Valve) pair.b).in());
Bin.move(in, first().in()); // Give to the first in the list
// Start each valve that has data and space
for (Valve valve : list) valve.start();
}
/** true if this ValveList is empty of data. */
public boolean isEmpty() throws Exception {
if (in != null && in.hasData()) return false; // Not empty
for (Valve valve : list) if (!valve.isEmpty()) return false;
if (out != null && out.hasData()) return false;
return true;
}
/** Make a new list of Valve objects that will take in and or put out data. */
public Flow(Update update, boolean in, boolean out) {
this.update = update;
list = new LinkedList<Valve>();
if (in) this.in = Bin.medium(); // Make the requested bins
if (out) this.out = Bin.medium();
}