common/buildcraft/api/power/PowerHandler.java - minecraft/mekanism - Rivoreo Source Code Repositories

 /**
  * Copyright (c) SpaceToad, 2011 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.api.power;

 import buildcraft.api.core.SafeTimeTracker;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraftforge.common.ForgeDirection;

 /**
  * The PowerHandler is similar to FluidTank in that it holds your power and
  * allows standardized interaction between machines.
  *
  * To receive power to your machine you needs create an instance of PowerHandler
  * and implement IPowerReceptor on the TileEntity.
  *
  * If you plan emit power, you need only implement IPowerEmitter. You do not
  * need a PowerHandler. Engines have a PowerHandler because they can also
  * receive power from other Engines.
  *
  * See TileRefinery for a simple example of a power using machine.
  *
  * @see IPowerReceptor
  * @see IPowerEmitter
  *
  * @author CovertJaguar <http://www.railcraft.info/>
  */
 public final class PowerHandler {

 	public static enum Type {

 		ENGINE, GATE, MACHINE, PIPE, STORAGE;

 		public boolean canReceiveFromPipes() {
 			switch (this) {
 				case MACHINE:
 				case STORAGE:
 					return true;
 				default:
 					return false;
 			}
 		}

 		public boolean eatsEngineExcess() {
 			switch (this) {
 				case MACHINE:
 				case STORAGE:
 					return true;
 				default:
 					return false;
 			}
 		}
 	}

 	/**
 	 * Extend this class to create custom Perdition algorithms (its not final).
 	 *
 	 * NOTE: It is not possible to create a Zero perdition algorithm.
 	 */
 	public static class PerditionCalculator {

 		public static final float DEFAULT_POWERLOSS = 1F;
 		public static final float MIN_POWERLOSS = 0.01F;
 		private final float powerLoss;

 		public PerditionCalculator() {
 			powerLoss = DEFAULT_POWERLOSS;
 		}

 		/**
 		 * Simple constructor for simple Perdition per tick.
 		 *
 		 * @param powerLoss power loss per tick
 		 */
 		public PerditionCalculator(float powerLoss) {
 			if (powerLoss < MIN_POWERLOSS) {
 				powerLoss = MIN_POWERLOSS;
 			}
 			this.powerLoss = powerLoss;
 		}

 		/**
 		 * Apply the perdition algorithm to the current stored energy. This
 		 * function can only be called once per tick, but it might not be called
 		 * every tick. It is triggered by any manipulation of the stored energy.
 		 *
 		 * @param powerHandler the PowerHandler requesting the perdition update
 		 * @param current the current stored energy
 		 * @param ticksPassed ticks since the last time this function was called
 		 * @return
 		 */
 		public float applyPerdition(PowerHandler powerHandler, float current, long ticksPassed) {
 //			float prev = current;
 			current -= powerLoss * ticksPassed;
 			if (current < 0) {
 				current = 0;
 			}
 //			powerHandler.totalLostPower += prev - current;
 			return current;
 		}

 		/**
 		 * Taxes a flat rate on all incoming power.
 		 *
 		 * Defaults to 0% tax rate.
 		 *
 		 * @return percent of input to tax
 		 */
 		public float getTaxPercent() {
 			return 0;
 		}
 	}
 	public static final PerditionCalculator DEFAULT_PERDITION = new PerditionCalculator();
 	private float minEnergyReceived;
 	private float maxEnergyReceived;
 	private float maxEnergyStored;
 	private float activationEnergy;
 	private float energyStored = 0;
 	private final SafeTimeTracker doWorkTracker = new SafeTimeTracker();
 	private final SafeTimeTracker sourcesTracker = new SafeTimeTracker();
 	private final SafeTimeTracker perditionTracker = new SafeTimeTracker();
 	public final int[] powerSources = new int[6];
 	public final IPowerReceptor receptor;
 	private PerditionCalculator perdition;
 	private final PowerReceiver receiver;
 	private final Type type;
 	// Debug
 //	private double totalLostPower = 0;
 //	private double totalReceivedPower = 0;
 //	private double totalUsedPower = 0;
 //	private long startTime = -1;

 	public PowerHandler(IPowerReceptor receptor, Type type) {
 		this.receptor = receptor;
 		this.type = type;
 		this.receiver = new PowerReceiver();
 		this.perdition = DEFAULT_PERDITION;
 	}

 	public PowerReceiver getPowerReceiver() {
 		return receiver;
 	}

 	public float getMinEnergyReceived() {
 		return minEnergyReceived;
 	}

 	public float getMaxEnergyReceived() {
 		return maxEnergyReceived;
 	}

 	public float getMaxEnergyStored() {
 		return maxEnergyStored;
 	}

 	public float getActivationEnergy() {
 		return activationEnergy;
 	}

 	public float getEnergyStored() {
 		return energyStored;
 	}

 	/**
 	 * Setup your PowerHandler's settings.
 	 *
 	 * @param minEnergyReceived This is the minimum about of power that will be
 	 * accepted by the PowerHandler. This should generally be greater than the
 	 * activationEnergy if you plan to use the doWork() callback. Anything
 	 * greater than 1 will prevent Redstone Engines from powering this Provider.
 	 * @param maxEnergyReceived The maximum amount of power accepted by the
 	 * PowerHandler. This should generally be less than 500. Too low and larger
 	 * engines will overheat while trying to power the machine. Too high, and
 	 * the engines will never warm up. Greater values also place greater strain
 	 * on the power net.
 	 * @param activationEnergy If the stored energy is greater than this value,
 	 * the doWork() callback is called (once per tick).
 	 * @param maxStoredEnergy The maximum amount of power this PowerHandler can
 	 * store. Values tend to range between 100 and 5000. With 1000 and 1500
 	 * being common.
 	 */
 	public void configure(float minEnergyReceived, float maxEnergyReceived, float activationEnergy, float maxStoredEnergy) {
 		if (minEnergyReceived > maxEnergyReceived) {
 			maxEnergyReceived = minEnergyReceived;
 		}
 		this.minEnergyReceived = minEnergyReceived;
 		this.maxEnergyReceived = maxEnergyReceived;
 		this.maxEnergyStored = maxStoredEnergy;
 		this.activationEnergy = activationEnergy;
 	}

 	/**
 	 * Allows you define perdition in terms of loss/ticks.
 	 *
 	 * This function is mostly for legacy implementations. See
 	 * PerditionCalculator for more complex perdition formulas.
 	 *
 	 * @param powerLoss
 	 * @param powerLossRegularity
 	 * @see PerditionCalculator
 	 */
 	public void configurePowerPerdition(int powerLoss, int powerLossRegularity) {
 		if (powerLoss == 0 || powerLossRegularity == 0) {
 			perdition = new PerditionCalculator(0);
 			return;
 		}
 		perdition = new PerditionCalculator((float) powerLoss / (float) powerLossRegularity);
 	}

 	/**
 	 * Allows you to define a new PerditionCalculator class to handler perdition
 	 * calculations.
 	 *
 	 * For example if you want exponentially increasing loss based on amount
 	 * stored.
 	 *
 	 * @param perdition
 	 */
 	public void setPerdition(PerditionCalculator perdition) {
 		if (perdition == null)
 			perdition = DEFAULT_PERDITION;
 		this.perdition = perdition;
 	}

 	public PerditionCalculator getPerdition() {
 		if (perdition == null)
 			return DEFAULT_PERDITION;
 		return perdition;
 	}

 	/**
 	 * Ticks the power handler. You should call this if you can, but its not
 	 * required.
 	 *
 	 * If you don't call it, the possibility exists for some weirdness with the
 	 * perdition algorithm and work callback as its possible they will not be
 	 * called on every tick they otherwise would be. You should be able to
 	 * design around this though if you are aware of the limitations.
 	 */
 	public void update() {
 //		if (startTime == -1)
 //			startTime = receptor.getWorld().getTotalWorldTime();
 //		else {
 //			long duration = receptor.getWorld().getTotalWorldTime() - startTime;
 //			System.out.printf("Power Stats: %s - Stored: %.2f Gained: %.2f - %.2f/t Lost: %.2f - %.2f/t Used: %.2f - %.2f/t%n", receptor.getClass().getSimpleName(), energyStored, totalReceivedPower, totalReceivedPower / duration, totalLostPower, totalLostPower / duration, totalUsedPower, totalUsedPower / duration);
 //		}

 		applyPerdition();
 		applyWork();
 		validateEnergy();
 	}

 	private void applyPerdition() {
 		if (perditionTracker.markTimeIfDelay(receptor.getWorld(), 1) && energyStored > 0) {
 			float newEnergy = getPerdition().applyPerdition(this, energyStored, perditionTracker.durationOfLastDelay());
 			if (newEnergy == 0 || newEnergy < energyStored)
 				energyStored = newEnergy;
 			else
 				energyStored = DEFAULT_PERDITION.applyPerdition(this, energyStored, perditionTracker.durationOfLastDelay());
 			validateEnergy();
 		}
 	}

 	private void applyWork() {
 		if (energyStored >= activationEnergy) {
 			if (doWorkTracker.markTimeIfDelay(receptor.getWorld(), 1)) {
 				receptor.doWork(this);
 			}
 		}
 	}

 	private void updateSources(ForgeDirection source) {
 		if (sourcesTracker.markTimeIfDelay(receptor.getWorld(), 1)) {
 			for (int i = 0; i < 6; ++i) {
 				powerSources[i] -= sourcesTracker.durationOfLastDelay();
 				if (powerSources[i] < 0) {
 					powerSources[i] = 0;
 				}
 			}
 		}

 		if (source != null)
 			powerSources[source.ordinal()] = 10;
 	}

 	/**
 	 * Extract energy from the PowerHandler. You must call this even if doWork()
 	 * triggers.
 	 *
 	 * @param min
 	 * @param max
 	 * @param doUse
 	 * @return amount used
 	 */
 	public float useEnergy(float min, float max, boolean doUse) {
 		applyPerdition();

 		float result = 0;

 		if (energyStored >= min) {
 			if (energyStored <= max) {
 				result = energyStored;
 				if (doUse) {
 					energyStored = 0;
 				}
 			} else {
 				result = max;
 				if (doUse) {
 					energyStored -= max;
 				}
 			}
 		}

 		validateEnergy();

 //		if (doUse)
 //			totalUsedPower += result;

 		return result;
 	}

 	public void readFromNBT(NBTTagCompound data) {
 		readFromNBT(data, "powerProvider");
 	}

 	public void readFromNBT(NBTTagCompound data, String tag) {
 		NBTTagCompound nbt = data.getCompoundTag(tag);
 		energyStored = nbt.getFloat("storedEnergy");
 	}

 	public void writeToNBT(NBTTagCompound data) {
 		writeToNBT(data, "powerProvider");
 	}

 	public void writeToNBT(NBTTagCompound data, String tag) {
 		NBTTagCompound nbt = new NBTTagCompound();
 		nbt.setFloat("storedEnergy", energyStored);
 		data.setCompoundTag(tag, nbt);
 	}

 	public final class PowerReceiver {

 		private PowerReceiver() {
 		}

 		public float getMinEnergyReceived() {
 			return minEnergyReceived;
 		}

 		public float getMaxEnergyReceived() {
 			return maxEnergyReceived;
 		}

 		public float getMaxEnergyStored() {
 			return maxEnergyStored;
 		}

 		public float getActivationEnergy() {
 			return activationEnergy;
 		}

 		public float getEnergyStored() {
 			return energyStored;
 		}

 		public Type getType() {
 			return type;
 		}

 		public void update() {
 			PowerHandler.this.update();
 		}

 		/**
 		 * The amount of power that this PowerHandler currently needs.
 		 *
 		 * @return
 		 */
 		public float powerRequest() {
 			update();
 			return Math.min(maxEnergyReceived, maxEnergyStored - energyStored);
 		}

 		/**
 		 * Add power to the PowerReceiver from an external source.
 		 *
 		 * IPowerEmitters are responsible for calling this themselves.
 		 *
 		 * @param quantity
 		 * @param from
 		 * @return the amount of power used
 		 */
 		public float receiveEnergy(Type source, final float quantity, ForgeDirection from) {
 			float used = quantity;
 			if (source == Type.ENGINE) {
 				if (used < minEnergyReceived) {
 					return 0;
 				} else if (used > maxEnergyReceived) {
 					used = maxEnergyReceived;
 				}
 			}

 			updateSources(from);

 			used -= used * getPerdition().getTaxPercent();

 			used = addEnergy(used);

 			applyWork();

 			if (source == Type.ENGINE && type.eatsEngineExcess()) {
 				used = Math.min(quantity, maxEnergyReceived);
 			}

 //			totalReceivedPower += used;

 			return used;
 		}
 	}

 	/**
 	 *
 	 * @return the amount the power changed by
 	 */
 	public float addEnergy(float quantity) {
 		energyStored += quantity;

 		if (energyStored > maxEnergyStored) {
 			quantity -= energyStored - maxEnergyStored;
 			energyStored = maxEnergyStored;
 		} else if (energyStored < 0) {
 			quantity -= energyStored;
 			energyStored = 0;
 		}

 		applyPerdition();

 		return quantity;
 	}

 	public void setEnergy(float quantity) {
 		this.energyStored = quantity;
 		validateEnergy();
 	}

 	public boolean isPowerSource(ForgeDirection from) {
 		return powerSources[from.ordinal()] != 0;
 	}

 	private void validateEnergy() {
 		if (energyStored < 0) {
 			energyStored = 0;
 		}
 		if (energyStored > maxEnergyStored) {
 			energyStored = maxEnergyStored;
 		}
 	}
 }
	/**
	* Copyright (c) SpaceToad, 2011 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.api.power;

	import buildcraft.api.core.SafeTimeTracker;
	import net.minecraft.nbt.NBTTagCompound;
	import net.minecraftforge.common.ForgeDirection;

	/**
	* The PowerHandler is similar to FluidTank in that it holds your power and
	* allows standardized interaction between machines.
	*
	* To receive power to your machine you needs create an instance of PowerHandler
	* and implement IPowerReceptor on the TileEntity.
	*
	* If you plan emit power, you need only implement IPowerEmitter. You do not
	* need a PowerHandler. Engines have a PowerHandler because they can also
	* receive power from other Engines.
	*
	* See TileRefinery for a simple example of a power using machine.
	*
	* @see IPowerReceptor
	* @see IPowerEmitter
	*
	* @author CovertJaguar <http://www.railcraft.info/>
	*/
	public final class PowerHandler {

	public static enum Type {

	ENGINE, GATE, MACHINE, PIPE, STORAGE;

	public boolean canReceiveFromPipes() {
	switch (this) {
	case MACHINE:
	case STORAGE:
	return true;
	default:
	return false;
	}
	}

	public boolean eatsEngineExcess() {
	switch (this) {
	case MACHINE:
	case STORAGE:
	return true;
	default:
	return false;
	}
	}
	}

	/**
	* Extend this class to create custom Perdition algorithms (its not final).
	*
	* NOTE: It is not possible to create a Zero perdition algorithm.
	*/
	public static class PerditionCalculator {

	public static final float DEFAULT_POWERLOSS = 1F;
	public static final float MIN_POWERLOSS = 0.01F;
	private final float powerLoss;

	public PerditionCalculator() {
	powerLoss = DEFAULT_POWERLOSS;
	}

	/**
	* Simple constructor for simple Perdition per tick.
	*
	* @param powerLoss power loss per tick
	*/
	public PerditionCalculator(float powerLoss) {
	if (powerLoss < MIN_POWERLOSS) {
	powerLoss = MIN_POWERLOSS;
	}
	this.powerLoss = powerLoss;
	}

	/**
	* Apply the perdition algorithm to the current stored energy. This
	* function can only be called once per tick, but it might not be called
	* every tick. It is triggered by any manipulation of the stored energy.
	*
	* @param powerHandler the PowerHandler requesting the perdition update
	* @param current the current stored energy
	* @param ticksPassed ticks since the last time this function was called
	* @return
	*/
	public float applyPerdition(PowerHandler powerHandler, float current, long ticksPassed) {
	// float prev = current;
	current -= powerLoss * ticksPassed;
	if (current < 0) {
	current = 0;
	}
	// powerHandler.totalLostPower += prev - current;
	return current;
	}

	/**
	* Taxes a flat rate on all incoming power.
	*
	* Defaults to 0% tax rate.
	*
	* @return percent of input to tax
	*/
	public float getTaxPercent() {
	return 0;
	}
	}
	public static final PerditionCalculator DEFAULT_PERDITION = new PerditionCalculator();
	private float minEnergyReceived;
	private float maxEnergyReceived;
	private float maxEnergyStored;
	private float activationEnergy;
	private float energyStored = 0;
	private final SafeTimeTracker doWorkTracker = new SafeTimeTracker();
	private final SafeTimeTracker sourcesTracker = new SafeTimeTracker();
	private final SafeTimeTracker perditionTracker = new SafeTimeTracker();
	public final int[] powerSources = new int[6];
	public final IPowerReceptor receptor;
	private PerditionCalculator perdition;
	private final PowerReceiver receiver;
	private final Type type;
	// Debug
	// private double totalLostPower = 0;
	// private double totalReceivedPower = 0;
	// private double totalUsedPower = 0;
	// private long startTime = -1;

	public PowerHandler(IPowerReceptor receptor, Type type) {
	this.receptor = receptor;
	this.type = type;
	this.receiver = new PowerReceiver();
	this.perdition = DEFAULT_PERDITION;
	}

	public PowerReceiver getPowerReceiver() {
	return receiver;
	}

	public float getMinEnergyReceived() {
	return minEnergyReceived;
	}

	public float getMaxEnergyReceived() {
	return maxEnergyReceived;
	}

	public float getMaxEnergyStored() {
	return maxEnergyStored;
	}

	public float getActivationEnergy() {
	return activationEnergy;
	}

	public float getEnergyStored() {
	return energyStored;
	}

	/**
	* Setup your PowerHandler's settings.
	*
	* @param minEnergyReceived This is the minimum about of power that will be
	* accepted by the PowerHandler. This should generally be greater than the
	* activationEnergy if you plan to use the doWork() callback. Anything
	* greater than 1 will prevent Redstone Engines from powering this Provider.
	* @param maxEnergyReceived The maximum amount of power accepted by the
	* PowerHandler. This should generally be less than 500. Too low and larger
	* engines will overheat while trying to power the machine. Too high, and
	* the engines will never warm up. Greater values also place greater strain
	* on the power net.
	* @param activationEnergy If the stored energy is greater than this value,
	* the doWork() callback is called (once per tick).
	* @param maxStoredEnergy The maximum amount of power this PowerHandler can
	* store. Values tend to range between 100 and 5000. With 1000 and 1500
	* being common.
	*/
	public void configure(float minEnergyReceived, float maxEnergyReceived, float activationEnergy, float maxStoredEnergy) {
	if (minEnergyReceived > maxEnergyReceived) {
	maxEnergyReceived = minEnergyReceived;
	}
	this.minEnergyReceived = minEnergyReceived;
	this.maxEnergyReceived = maxEnergyReceived;
	this.maxEnergyStored = maxStoredEnergy;
	this.activationEnergy = activationEnergy;
	}

	/**
	* Allows you define perdition in terms of loss/ticks.
	*
	* This function is mostly for legacy implementations. See
	* PerditionCalculator for more complex perdition formulas.
	*
	* @param powerLoss
	* @param powerLossRegularity
	* @see PerditionCalculator
	*/
	public void configurePowerPerdition(int powerLoss, int powerLossRegularity) {
	if (powerLoss == 0 \|\| powerLossRegularity == 0) {
	perdition = new PerditionCalculator(0);
	return;
	}
	perdition = new PerditionCalculator((float) powerLoss / (float) powerLossRegularity);
	}

	/**
	* Allows you to define a new PerditionCalculator class to handler perdition
	* calculations.
	*
	* For example if you want exponentially increasing loss based on amount
	* stored.
	*
	* @param perdition
	*/
	public void setPerdition(PerditionCalculator perdition) {
	if (perdition == null)
	perdition = DEFAULT_PERDITION;
	this.perdition = perdition;
	}

	public PerditionCalculator getPerdition() {
	if (perdition == null)
	return DEFAULT_PERDITION;
	return perdition;
	}

	/**
	* Ticks the power handler. You should call this if you can, but its not
	* required.
	*
	* If you don't call it, the possibility exists for some weirdness with the
	* perdition algorithm and work callback as its possible they will not be
	* called on every tick they otherwise would be. You should be able to
	* design around this though if you are aware of the limitations.
	*/
	public void update() {
	// if (startTime == -1)
	// startTime = receptor.getWorld().getTotalWorldTime();
	// else {
	// long duration = receptor.getWorld().getTotalWorldTime() - startTime;
	// System.out.printf("Power Stats: %s - Stored: %.2f Gained: %.2f - %.2f/t Lost: %.2f - %.2f/t Used: %.2f - %.2f/t%n", receptor.getClass().getSimpleName(), energyStored, totalReceivedPower, totalReceivedPower / duration, totalLostPower, totalLostPower / duration, totalUsedPower, totalUsedPower / duration);
	// }

	applyPerdition();
	applyWork();
	validateEnergy();
	}

	private void applyPerdition() {
	if (perditionTracker.markTimeIfDelay(receptor.getWorld(), 1) && energyStored > 0) {
	float newEnergy = getPerdition().applyPerdition(this, energyStored, perditionTracker.durationOfLastDelay());
	if (newEnergy == 0 \|\| newEnergy < energyStored)
	energyStored = newEnergy;
	else
	energyStored = DEFAULT_PERDITION.applyPerdition(this, energyStored, perditionTracker.durationOfLastDelay());
	validateEnergy();
	}
	}

	private void applyWork() {
	if (energyStored >= activationEnergy) {
	if (doWorkTracker.markTimeIfDelay(receptor.getWorld(), 1)) {
	receptor.doWork(this);
	}
	}
	}

	private void updateSources(ForgeDirection source) {
	if (sourcesTracker.markTimeIfDelay(receptor.getWorld(), 1)) {
	for (int i = 0; i < 6; ++i) {
	powerSources[i] -= sourcesTracker.durationOfLastDelay();
	if (powerSources[i] < 0) {
	powerSources[i] = 0;
	}
	}
	}

	if (source != null)
	powerSources[source.ordinal()] = 10;
	}

	/**
	* Extract energy from the PowerHandler. You must call this even if doWork()
	* triggers.
	*
	* @param min
	* @param max
	* @param doUse
	* @return amount used
	*/
	public float useEnergy(float min, float max, boolean doUse) {
	applyPerdition();

	float result = 0;

	if (energyStored >= min) {
	if (energyStored <= max) {
	result = energyStored;
	if (doUse) {
	energyStored = 0;
	}
	} else {
	result = max;
	if (doUse) {
	energyStored -= max;
	}
	}
	}

	validateEnergy();

	// if (doUse)
	// totalUsedPower += result;

	return result;
	}

	public void readFromNBT(NBTTagCompound data) {
	readFromNBT(data, "powerProvider");
	}

	public void readFromNBT(NBTTagCompound data, String tag) {
	NBTTagCompound nbt = data.getCompoundTag(tag);
	energyStored = nbt.getFloat("storedEnergy");
	}

	public void writeToNBT(NBTTagCompound data) {
	writeToNBT(data, "powerProvider");
	}

	public void writeToNBT(NBTTagCompound data, String tag) {
	NBTTagCompound nbt = new NBTTagCompound();
	nbt.setFloat("storedEnergy", energyStored);
	data.setCompoundTag(tag, nbt);
	}

	public final class PowerReceiver {

	private PowerReceiver() {
	}

	public float getMinEnergyReceived() {
	return minEnergyReceived;
	}

	public float getMaxEnergyReceived() {
	return maxEnergyReceived;
	}

	public float getMaxEnergyStored() {
	return maxEnergyStored;
	}

	public float getActivationEnergy() {
	return activationEnergy;
	}

	public float getEnergyStored() {
	return energyStored;
	}

	public Type getType() {
	return type;
	}

	public void update() {
	PowerHandler.this.update();
	}

	/**
	* The amount of power that this PowerHandler currently needs.
	*
	* @return
	*/
	public float powerRequest() {
	update();
	return Math.min(maxEnergyReceived, maxEnergyStored - energyStored);
	}

	/**
	* Add power to the PowerReceiver from an external source.
	*
	* IPowerEmitters are responsible for calling this themselves.
	*
	* @param quantity
	* @param from
	* @return the amount of power used
	*/
	public float receiveEnergy(Type source, final float quantity, ForgeDirection from) {
	float used = quantity;
	if (source == Type.ENGINE) {
	if (used < minEnergyReceived) {
	return 0;
	} else if (used > maxEnergyReceived) {
	used = maxEnergyReceived;
	}
	}

	updateSources(from);

	used -= used * getPerdition().getTaxPercent();

	used = addEnergy(used);

	applyWork();

	if (source == Type.ENGINE && type.eatsEngineExcess()) {
	used = Math.min(quantity, maxEnergyReceived);
	}

	// totalReceivedPower += used;

	return used;
	}
	}

	/**
	*
	* @return the amount the power changed by
	*/
	public float addEnergy(float quantity) {
	energyStored += quantity;

	if (energyStored > maxEnergyStored) {
	quantity -= energyStored - maxEnergyStored;
	energyStored = maxEnergyStored;
	} else if (energyStored < 0) {
	quantity -= energyStored;
	energyStored = 0;
	}

	applyPerdition();

	return quantity;
	}

	public void setEnergy(float quantity) {
	this.energyStored = quantity;
	validateEnergy();
	}

	public boolean isPowerSource(ForgeDirection from) {
	return powerSources[from.ordinal()] != 0;
	}

	private void validateEnergy() {
	if (energyStored < 0) {
	energyStored = 0;
	}
	if (energyStored > maxEnergyStored) {
	energyStored = maxEnergyStored;
	}
	}
	}