/**
* Copyright (c) 2011-2015, SpaceToad and the BuildCraft Team
* http://www.mod-buildcraft.com
* <p/>
* BuildCraft is distributed under the terms of the Minecraft Mod Public
* License 1.0, or MMPL. Please check the contents of the license located in
* http://www.mod-buildcraft.com/MMPL-1.0.txt
*/
package buildcraft.transport.utils;
import io.netty.buffer.ByteBuf;
import net.minecraftforge.common.util.ForgeDirection;
public class ConnectionMatrix {
private int mask = 0;
private boolean dirty = false;
public ConnectionMatrix() {
}
public boolean isConnected(ForgeDirection direction) {
// test if the direction.ordinal()'th bit of mask is set
return (mask & (1 << direction.ordinal())) != 0;
}
public void setConnected(ForgeDirection direction, boolean value) {
if (isConnected(direction) != value) {
// invert the direction.ordinal()'th bit of mask
mask ^= 1 << direction.ordinal();
dirty = true;
}
}
/**
* Return a mask representing the connectivity for all sides.
*
* @return mask in ForgeDirection order, least significant bit = first entry
*/
public int getMask() {
return mask;
}
public boolean isDirty() {
return dirty;
}
public void clean() {
dirty = false;
}
public void writeData(ByteBuf data) {
data.writeByte(mask);
}
public void readData(ByteBuf data) {
byte newMask = data.readByte();
if (newMask != mask) {
mask = newMask;
dirty = true;
}
}
}