Applied-Energistics-2-tiler.../me/pathfinding/PathSegment.java

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package appeng.me.pathfinding;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import appeng.api.networking.GridFlags;
import appeng.api.networking.IGridMultiblock;
import appeng.api.networking.IGridNode;
public class PathSegment
{
public boolean isDead;
static class RouteComplete extends Exception
{
private static final long serialVersionUID = 810456465120286110L;
};
public PathSegment(List open, Set semiopen, Set closed) {
this.open = open;
this.semiopen = semiopen;
this.closed = closed;
isDead = false;
}
List<IPathItem> open;
Set<IPathItem> semiopen;
Set<IPathItem> closed;
public boolean step()
{
List<IPathItem> oldOpen = open;
open = new LinkedList();
for (IPathItem i : oldOpen)
{
for (IPathItem pi : i.getPossibleOptions())
{
EnumSet<GridFlags> flags = pi.getFlags();
if ( !closed.contains( pi ) )
{
pi.setControllerRoute( i, true );
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if ( flags.contains( GridFlags.REQUIRE_CHANNEL ) )
{
// close the semi open.
if ( !semiopen.contains( pi ) )
{
boolean worked = false;
if ( flags.contains( GridFlags.DENSE_CHANNEL ) )
worked = useDenseChannel( pi );
else
worked = useChannel( pi );
if ( worked && flags.contains( GridFlags.MULTIBLOCK ) )
{
Iterator<IGridNode> oni = ((IGridMultiblock) ((IGridNode) pi).getGridBlock()).getMultiblockNodes();
while (oni.hasNext())
{
IGridNode otherNodes = oni.next();
if ( otherNodes != pi )
semiopen.add( (IPathItem) otherNodes );
}
}
}
else
{
pi.incrementChannelCount( 1 ); // give a channel.
semiopen.remove( pi );
}
}
closed.add( pi );
open.add( pi );
}
}
}
return open.isEmpty();
}
private boolean useChannel(IPathItem start)
{
IPathItem pi = start;
while (pi != null)
{
if ( !pi.canSupportMoreChannels() )
return false;
pi = pi.getControllerRoute();
}
pi = start;
while (pi != null)
{
pi.incrementChannelCount( 1 );
pi = pi.getControllerRoute();
}
return true;
}
private boolean useDenseChannel(IPathItem start)
{
IPathItem pi = start;
while (pi != null)
{
if ( !pi.canSupportMoreChannels() || pi.getFlags().contains( GridFlags.CANNOT_CARRY_DENSE ) )
return false;
pi = pi.getControllerRoute();
}
pi = start;
while (pi != null)
{
pi.incrementChannelCount( 1 );
pi = pi.getControllerRoute();
}
return true;
}
}