ForgePatch/common/net/minecraftforge/liquids/ILiquidTank.java

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package net.minecraftforge.liquids;
/**
* A tank is the unit of interaction with liquid inventories.
*
* @author cpw
*/
public interface ILiquidTank {
/**
* @return LiquidStack representing the liquid contained in the tank, null if empty.
*/
LiquidStack getLiquid();
/**
* @return capacity of this tank
*/
int getCapacity();
/**
*
* @param resource
* @param doFill
* @return Amount of liquid used for filling.
*/
int fill(LiquidStack resource, boolean doFill);
/**
*
* @param maxDrain
* @param doDrain
* @return Null if nothing was drained, otherwise a LiquidStack containing the drained.
*/
LiquidStack drain(int maxDrain, boolean doDrain);
/**
* Positive values indicate a positive liquid pressure (liquid wants to leave this tank)
* Negative values indicate a negative liquid pressure (liquid wants to fill this tank)
* Zero indicates no pressure
*
* @return a number indicating tank pressure
*/
public int getTankPressure();
}