/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.logisim.proj;
import com.cburch.logisim.circuit.Circuit;
import com.cburch.logisim.circuit.CircuitEvent;
import com.cburch.logisim.circuit.CircuitListener;
import com.cburch.logisim.circuit.SubcircuitFactory;
import com.cburch.logisim.comp.Component;
import com.cburch.logisim.comp.ComponentFactory;
import com.cburch.logisim.file.LibraryEvent;
import com.cburch.logisim.file.LibraryListener;
import com.cburch.logisim.file.LogisimFile;
import com.cburch.logisim.tools.AddTool;
import com.cburch.logisim.util.Dag;
public class Dependencies {
private class MyListener
implements LibraryListener, CircuitListener {
public void libraryChanged(LibraryEvent e) {
switch (e.getAction()) {
case LibraryEvent.ADD_TOOL:
if (e.getData() instanceof AddTool) {
ComponentFactory factory = ((AddTool) e.getData()).getFactory();
if (factory instanceof SubcircuitFactory) {
SubcircuitFactory circFact = (SubcircuitFactory) factory;
processCircuit(circFact.getSubcircuit());
}
}
break;
case LibraryEvent.REMOVE_TOOL:
if (e.getData() instanceof AddTool) {
ComponentFactory factory = ((AddTool) e.getData()).getFactory();
if (factory instanceof SubcircuitFactory) {
SubcircuitFactory circFact = (SubcircuitFactory) factory;
Circuit circ = circFact.getSubcircuit();
depends.removeNode(circ);
circ.removeCircuitListener(this);
}
}
break;
}
}
public void circuitChanged(CircuitEvent e) {
Component comp;
switch (e.getAction()) {
case CircuitEvent.ACTION_ADD:
comp = (Component) e.getData();
if (comp.getFactory() instanceof SubcircuitFactory) {
SubcircuitFactory factory = (SubcircuitFactory) comp.getFactory();
depends.addEdge(e.getCircuit(), factory.getSubcircuit());
}
break;
case CircuitEvent.ACTION_REMOVE:
comp = (Component) e.getData();
if (comp.getFactory() instanceof SubcircuitFactory) {
SubcircuitFactory factory = (SubcircuitFactory) comp.getFactory();
boolean found = false;
for (Component o : e.getCircuit().getNonWires()) {
if (o.getFactory() == factory) {
found = true;
break;
}
}
if (!found) depends.removeEdge(e.getCircuit(), factory.getSubcircuit());
}
break;
case CircuitEvent.ACTION_CLEAR:
depends.removeNode(e.getCircuit());
break;
}
}
}
private MyListener myListener = new MyListener();
private Dag depends = new Dag();
Dependencies(LogisimFile file) {
addDependencies(file);
}
public boolean canRemove(Circuit circ) {
return !depends.hasPredecessors(circ);
}
public boolean canAdd(Circuit circ, Circuit sub) {
return depends.canFollow(sub, circ);
}
private void addDependencies(LogisimFile file) {
file.addLibraryListener(myListener);
for (Circuit circuit : file.getCircuits()) {
processCircuit(circuit);
}
}
private void processCircuit(Circuit circ) {
circ.addCircuitListener(myListener);
for (Component comp : circ.getNonWires()) {
if (comp.getFactory() instanceof SubcircuitFactory) {
SubcircuitFactory factory = (SubcircuitFactory) comp.getFactory();
depends.addEdge(circ, factory.getSubcircuit());
}
}
}
}