buildcraft.transport.utils.ConnectionMatrix.java Source code

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Here is the source code for buildcraft.transport.utils.ConnectionMatrix.java

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/**
 * Copyright (c) 2011-2014, SpaceToad and the BuildCraft Team
 * http://www.mod-buildcraft.com
 *
 * 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 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;
        }
    }
}