/**
* Sets the loopSide of all self-loops of the component individually, depending on the side(s)
* already defined for at least one port in the component. At least one portSide must be defined,
* otherwise this method will run infinitely.
*
* @param component The connected component to process.
* @return The LoopSide that is equal to the assigned portSides. Undefined, if there is not a
* common side for all loops.
*/
private LoopSide setPortSideByConstraint(final ConnectedSelfLoopComponent component) {
// Iterator over the edges of the component.
// The iterator is cycling, as there is no guarantee, that (at least) one port of the current
// edge has a portSide defined. If both portSides of the current edge are UNDEFINED, we will
// return to it later.
final Iterator<LEdge> iter = Iterators.cycle(Lists.newArrayList(component.getEdges()));
// LoopSides in this component will be collected here
final EnumSet<LoopSide> loopSidesInComponent = EnumSet.noneOf(LoopSide.class);
while (iter.hasNext()) {
final LEdge edge = iter.next();
final PortSide sourceSide = edge.getSource().getSide();
final PortSide targetSide = edge.getTarget().getSide();
if (sourceSide == PortSide.UNDEFINED) {
// source side is undefined
if (targetSide != PortSide.UNDEFINED) {
// only targetSide is defined. Edge becomes a sideLoop on the side of target.
final LoopSide side = LoopSide.fromPortSides(targetSide);
edge.setProperty(InternalProperties.SPLINE_LOOPSIDE, side);
edge.getSource().setSide(targetSide);
loopSidesInComponent.add(side);
iter.remove();
}
} else {
// source side is defined
if (targetSide == PortSide.UNDEFINED) {
// only sourceSide is defined. Edge becomes a sideLoop on the side of source.
final LoopSide side = LoopSide.fromPortSides(sourceSide);
edge.setProperty(InternalProperties.SPLINE_LOOPSIDE, side);
edge.getTarget().setSide(sourceSide);
loopSidesInComponent.add(side);
iter.remove();
} else {
// both sides are defined, set edge side resulting from the combination
final LoopSide side = LoopSide.fromPortSide(sourceSide, targetSide);
edge.setProperty(InternalProperties.SPLINE_LOOPSIDE, side);
loopSidesInComponent.add(side);
iter.remove();
}
}
}
// Now all edges have a LoopSide assigned.
// Check if we can find a LoopSide for the whole component.
LoopSide side;
if (loopSidesInComponent.size() == 1) {
side = loopSidesInComponent.iterator().next();
} else {
side = LoopSide.UNDEFINED;
}
component.setLoopSide(side, false);
return side;
}
/**
* Removes all sides from the list of available sides, that already have an port places on it.
* Use to make sure no loops will be places on sides with ports containing non-loop edges.
*/
public void removeOccupiedSides() {
for (final LPort port : node.getPorts()) {
loopSides.removeSide(LoopSide.fromPortSides(port.getSide()));
}
}