src/main/java/cofh/api/energy/IEnergyContainerItem.java

package cofh.api.energy;

import net.minecraft.item.ItemStack;

/**
 * Implement this interface on Item classes that support external manipulation of their internal energy storages.
 * <p>
 * A reference implementation is provided {@link ItemEnergyContainer}.
 * 
 * @author King Lemming
 * 
 */
public interface IEnergyContainerItem {

	/**
	 * Adds energy to a container item. Returns the quantity of energy that was accepted. This should always return 0 if the item cannot be externally charged.
	 * 
	 * @param container
	 *            ItemStack to be charged.
	 * @param maxReceive
	 *            Maximum amount of energy to be sent into the item.
	 * @param simulate
	 *            If TRUE, the charge will only be simulated.
	 * @return Amount of energy that was (or would have been, if simulated) received by the item.
	 */
	int receiveEnergy(ItemStack container, int maxReceive, boolean simulate);

	/**
	 * Removes energy from a container item. Returns the quantity of energy that was removed. This should always return 0 if the item cannot be externally
	 * discharged.
	 * 
	 * @param container
	 *            ItemStack to be discharged.
	 * @param maxExtract
	 *            Maximum amount of energy to be extracted from the item.
	 * @param simulate
	 *            If TRUE, the discharge will only be simulated.
	 * @return Amount of energy that was (or would have been, if simulated) extracted from the item.
	 */
	int extractEnergy(ItemStack container, int maxExtract, boolean simulate);

	/**
	 * Get the amount of energy currently stored in the container item.
	 */
	int getEnergyStored(ItemStack container);

	/**
	 * Get the max amount of energy that can be stored in the container item.
	 */
	int getMaxEnergyStored(ItemStack container);

}