package appeng.me; import java.util.Arrays; import java.util.EnumSet; import net.minecraftforge.common.ForgeDirection; import appeng.api.exceptions.FailedConnection; import appeng.api.networking.GridFlags; import appeng.api.networking.IGridConnection; import appeng.api.networking.IGridNode; import appeng.api.networking.events.MENetworkChannelsChanged; import appeng.api.networking.pathing.IPathingGrid; import appeng.api.util.IReadOnlyCollection; import appeng.me.pathfinding.IPathItem; import appeng.util.Platform; import appeng.util.ReadOnlyCollection; public class GridConnection implements IGridConnection, IPathItem { final static private MENetworkChannelsChanged event = new MENetworkChannelsChanged(); private GridNode sideA; private ForgeDirection fromAtoB; private GridNode sideB; byte visitorIterationNumber = Byte.MIN_VALUE; public int channelData = 0; public GridConnection(IGridNode aNode, IGridNode bNode, ForgeDirection fromAtoB) throws FailedConnection { GridNode a = (GridNode) aNode; GridNode b = (GridNode) bNode; if ( Platform.securityCheck( a, b ) ) throw new FailedConnection(); if ( a == null || b == null ) throw new GridException( "Connection Forged Between null enties." ); if ( a.hasConnection( b ) || b.hasConnection( a ) ) throw new GridException( "Connection already exists." ); sideA = a; this.fromAtoB = fromAtoB; sideB = b; if ( b.myGrid == null ) { b.setGrid( a.getInternalGrid() ); } else { if ( a.myGrid == null ) { GridPropagator gp = new GridPropagator( b.getInternalGrid() ); a.beginVisition( gp ); } else if ( b.myGrid == null ) { GridPropagator gp = new GridPropagator( a.getInternalGrid() ); b.beginVisition( gp ); } else if ( a.myGrid.size() > b.myGrid.size() ) { GridPropagator gp = new GridPropagator( a.getInternalGrid() ); b.beginVisition( gp ); } else { GridPropagator gp = new GridPropagator( b.getInternalGrid() ); a.beginVisition( gp ); } } // a connection was destroyed RE-PATH!! IPathingGrid p = sideA.getInternalGrid().getCache( IPathingGrid.class ); p.repath(); sideA.addConnection( this ); sideB.addConnection( this ); } @Override public void destroy() { // a connection was destroyed RE-PATH!! IPathingGrid p = sideA.getInternalGrid().getCache( IPathingGrid.class ); p.repath(); sideA.removeConnection( this ); sideB.removeConnection( this ); sideA.validateGrid(); sideB.validateGrid(); } @Override public IGridNode a() { return sideA; } @Override public ForgeDirection getDirection(IGridNode side) { if ( fromAtoB == ForgeDirection.UNKNOWN ) return fromAtoB; if ( sideA == side ) return fromAtoB; else return fromAtoB.getOpposite(); } @Override public IGridNode b() { return sideB; } @Override public IGridNode getOtherSide(IGridNode gridNode) { if ( gridNode == sideA ) return sideB; if ( gridNode == sideB ) return sideA; throw new GridException( "Invalid Side of Connection" ); } @Override public boolean hasDirection() { return fromAtoB != ForgeDirection.UNKNOWN; } @Override public IReadOnlyCollection getPossibleOptions() { return new ReadOnlyCollection( Arrays.asList( new IPathItem[] { (IPathItem) a(), (IPathItem) b() } ) ); } @Override public void incrementChannelCount(int usedChannels) { channelData += usedChannels; } @Override public boolean canSupportMoreChannels() { return getLastUsedChannels() < 32; // max, PERIOD. } @Override public int getUsedChannels() { return (channelData >> 8) & 0xff; } public int getLastUsedChannels() { return channelData & 0xff; } @Override public IPathItem getControllerRoute() { if ( sideA.getFlags().contains( GridFlags.CANNOT_CARRY ) ) return null; return sideA; } @Override public void setControllerRoute(IPathItem fast, boolean zeroOut) { if ( zeroOut ) channelData &= ~0xff; if ( sideB == fast ) { GridNode tmp = sideA; sideA = sideB; sideB = tmp; fromAtoB = fromAtoB.getOpposite(); } } @Override public void finalizeChannels() { if ( getUsedChannels() != getLastUsedChannels() ) { channelData = (channelData & 0xff); channelData |= channelData << 8; if ( sideA.getInternalGrid() != null ) sideA.getInternalGrid().postEventTo( sideA, event ); if ( sideB.getInternalGrid() != null ) sideB.getInternalGrid().postEventTo( sideB, event ); } } @Override public EnumSet getFlags() { return EnumSet.noneOf( GridFlags.class ); } }