Add EmptyEnergyStorage (#9487)

src/main/java/net/minecraftforge/energy/EmptyEnergyStorage.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) Forge Development LLC and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.minecraftforge.energy;
+
+/**
+ * Implementation of {@link IEnergyStorage} that cannot store, receive, or provide energy.
+ * Use the {@link #INSTANCE}, don't instantiate. Example:
+ * <pre>{@code
+ * ItemStack stack = ...;
+ * IEnergyStorage storage = stack.getCapability(ForgeCapabilities.ENERGY).orElse(EmptyEnergyStorage.INSTANCE);
+ * // Use storage without checking whether it's present.
+ * }</pre>
+ */
+public class EmptyEnergyStorage implements IEnergyStorage
+{
+    public static final EmptyEnergyStorage INSTANCE = new EmptyEnergyStorage();
+
+    protected EmptyEnergyStorage() {}
+
+    @Override
+    public int receiveEnergy(int maxReceive, boolean simulate)
+    {
+        return 0;
+    }
+
+    @Override
+    public int extractEnergy(int maxExtract, boolean simulate)
+    {
+        return 0;
+    }
+
+    @Override
+    public int getEnergyStored()
+    {
+        return 0;
+    }
+
+    @Override
+    public int getMaxEnergyStored()
+    {
+        return 0;
+    }
+
+    @Override
+    public boolean canExtract()
+    {
+        return false;
+    }
+
+    @Override
+    public boolean canReceive()
+    {
+        return false;
+    }
+}