fix peripherals

src/main/java/dan200/computercraft/api/peripheral/IPeripheralTile.java

@@ -0,0 +1,31 @@
+/*
+ * This file is part of the public ComputerCraft API - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2019. This API may be redistributed unmodified and in full only.
+ * For help using the API, and posting your mods, visit the forums at computercraft.info.
+ */
+
+package dan200.computercraft.api.peripheral;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Direction;
+import net.minecraft.world.World;
+
+/**
+ * A {@link net.minecraft.block.entity.BlockEntity} which may act as a peripheral.
+ *
+ * If you need more complex capabilities (such as handling TEs not belonging to your mod), you should use {@link IPeripheralProvider}.
+ */
+public interface IPeripheralTile {
+    /**
+     * Get the peripheral on the given {@code side}.
+     *
+     * @param side The side to get the peripheral from.
+     * @return A peripheral, or {@code null} if there is not a peripheral here.
+     * @see IPeripheralProvider#getPeripheral(World, BlockPos, Direction)
+     */
+    @Nullable
+    IPeripheral getPeripheral(@Nonnull Direction side);
+}