Add forge energy (#180)

* Add forge energy
Pretty much exact from YarnForge, with formatting changes

* Fix license

* Update fabric.mod.json

* Move energy to patchwork-capabilities

* Remove patchwork-energy

patchwork-capabilities/src/main/java/net/minecraftforge/energy/CapabilityEnergy.java

@@ -0,0 +1,55 @@
+/*
+ * Minecraft Forge, Patchwork Project
+ * Copyright (c) 2016-2020, 2019-2020
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.minecraftforge.energy;
+
+import net.minecraftforge.common.capabilities.Capability;
+import net.minecraftforge.common.capabilities.Capability.IStorage;
+import net.minecraftforge.common.capabilities.CapabilityInject;
+import net.minecraftforge.common.capabilities.CapabilityManager;
+
+import net.minecraft.nbt.IntTag;
+import net.minecraft.nbt.Tag;
+import net.minecraft.util.math.Direction;
+
+public class CapabilityEnergy {
+	@CapabilityInject(IEnergyStorage.class)
+	public static Capability<IEnergyStorage> ENERGY = null;
+
+	public static void register() {
+		CapabilityManager.INSTANCE.register(IEnergyStorage.class, new IStorage<IEnergyStorage>() {
+					@Override
+					public Tag writeNBT(Capability<IEnergyStorage> capability, IEnergyStorage instance, Direction side) {
+						return new IntTag(instance.getEnergyStored());
+					}
+
+					@Override
+					public void readNBT(Capability<IEnergyStorage> capability, IEnergyStorage instance, Direction side, Tag nbt) {
+						if (!(instance instanceof EnergyStorage)) {
+							throw new IllegalArgumentException("Can not deserialize to an instance that isn't the default implementation");
+						}
+
+						((EnergyStorage) instance).energy = ((IntTag) nbt).getInt();
+					}
+				},
+				() -> new EnergyStorage(1000)
+		);
+	}
+}
+

patchwork-capabilities/src/main/java/net/minecraftforge/energy/EnergyStorage.java

@@ -0,0 +1,103 @@
+/*
+ * Minecraft Forge, Patchwork Project
+ * Copyright (c) 2016-2020, 2019-2020
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.minecraftforge.energy;
+
+/**
+ * <p>Reference implementation of {@link IEnergyStorage}. Use/extend this or implement your own.</p>
+ *
+ * <p>Derived from the Redstone Flux power system designed by King Lemming and originally utilized in Thermal Expansion and related mods.
+ * Created with consent and permission of King Lemming and Team CoFH. Released with permission under LGPL 2.1 when bundled with Forge.</p>
+ */
+public class EnergyStorage implements IEnergyStorage {
+	protected int energy;
+	protected int capacity;
+	protected int maxReceive;
+	protected int maxExtract;
+
+	public EnergyStorage(int capacity) {
+		this(capacity, capacity, capacity, 0);
+	}
+
+	public EnergyStorage(int capacity, int maxTransfer) {
+		this(capacity, maxTransfer, maxTransfer, 0);
+	}
+
+	public EnergyStorage(int capacity, int maxReceive, int maxExtract) {
+		this(capacity, maxReceive, maxExtract, 0);
+	}
+
+	public EnergyStorage(int capacity, int maxReceive, int maxExtract, int energy) {
+		this.capacity = capacity;
+		this.maxReceive = maxReceive;
+		this.maxExtract = maxExtract;
+		this.energy = Math.max(0, Math.min(capacity, energy));
+	}
+
+	@Override
+	public int receiveEnergy(int maxReceive, boolean simulate) {
+		if (!canReceive()) {
+			return 0;
+		}
+
+		int energyReceived = Math.min(capacity - energy, Math.min(this.maxReceive, maxReceive));
+
+		if (!simulate) {
+			energy += energyReceived;
+		}
+
+		return energyReceived;
+	}
+
+	@Override
+	public int extractEnergy(int maxExtract, boolean simulate) {
+		if (!canExtract()) {
+			return 0;
+		}
+
+		int energyExtracted = Math.min(energy, Math.min(this.maxExtract, maxExtract));
+
+		if (!simulate) {
+			energy -= energyExtracted;
+		}
+
+		return energyExtracted;
+	}
+
+	@Override
+	public int getEnergyStored() {
+		return energy;
+	}
+
+	@Override
+	public int getMaxEnergyStored() {
+		return capacity;
+	}
+
+	@Override
+	public boolean canExtract() {
+		return this.maxExtract > 0;
+	}
+
+	@Override
+	public boolean canReceive() {
+		return this.maxReceive > 0;
+	}
+}
+

patchwork-capabilities/src/main/java/net/minecraftforge/energy/IEnergyStorage.java

@@ -0,0 +1,74 @@
+/*
+ * Minecraft Forge, Patchwork Project
+ * Copyright (c) 2016-2020, 2019-2020
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.minecraftforge.energy;
+
+/**
+ * <p>An energy storage is the unit of interaction with Energy inventories.</p>
+ *
+ * <p>A reference implementation can be found at {@link EnergyStorage}.</p>
+ *
+ * <p>Derived from the Redstone Flux power system designed by King Lemming and originally utilized in Thermal Expansion and related mods.
+ * Created with consent and permission of King Lemming and Team CoFH. Released with permission under LGPL 2.1 when bundled with Forge.</p>
+ */
+public interface IEnergyStorage {
+	/**
+	 * Adds energy to the storage. Returns quantity of energy that was accepted.
+	 *
+	 * @param maxReceive
+	 *            Maximum amount of energy to be inserted.
+	 * @param simulate
+	 *            If TRUE, the insertion will only be simulated.
+	 * @return Amount of energy that was (or would have been, if simulated) accepted by the storage.
+	 */
+	int receiveEnergy(int maxReceive, boolean simulate);
+
+	/**
+	 * Removes energy from the storage. Returns quantity of energy that was removed.
+	 *
+	 * @param maxExtract
+	 *            Maximum amount of energy to be extracted.
+	 * @param simulate
+	 *            If TRUE, the extraction will only be simulated.
+	 * @return Amount of energy that was (or would have been, if simulated) extracted from the storage.
+	 */
+	int extractEnergy(int maxExtract, boolean simulate);
+
+	/**
+	 * Returns the amount of energy currently stored.
+	 */
+	int getEnergyStored();
+
+	/**
+	 * Returns the maximum amount of energy that can be stored.
+	 */
+	int getMaxEnergyStored();
+
+	/**
+	 * Returns if this storage can have energy extracted.
+	 * If this is false, then any calls to extractEnergy will return 0.
+	 */
+	boolean canExtract();
+
+	/**
+	 * Used to determine if this storage can receive energy.
+	 * If this is false, then any calls to receiveEnergy will return 0.
+	 */
+	boolean canReceive();
+}