Add NBT (de)serialization utility interfaces (#31)

* Fix NBTSerializer being dumb

* Rewrite NBTSerializer

Author: Kitten

src/main/java/org/dimdev/rift/util/NBTSerializable.java

@@ -0,0 +1,36 @@
+package org.dimdev.rift.util;
+
+import net.minecraft.nbt.NBTTagCompound;
+
+import javax.annotation.Nonnull;
+
+/**
+ * Base interface for (de)serializable objects to serialize
+ * themselves to and from {@link NBTTagCompound} tag compounds
+ */
+public interface NBTSerializable {
+    /**
+     * Writes this object's data to the given compound
+     * @param compound The tag compound to be written to
+     * @return The written tag compound
+     */
+    @Nonnull
+    NBTTagCompound serialize(@Nonnull NBTTagCompound compound);
+
+    /**
+     * Reads this object's data from the given compound
+     * @param compound The tag compound to be read from
+     * @return The given tag compound
+     */
+    @Nonnull
+    NBTTagCompound deserialize(@Nonnull NBTTagCompound compound);
+
+    /**
+     * Writes this object's data to a new tag compound
+     * @return The written tag compound
+     */
+    @Nonnull
+    default NBTTagCompound writeToNBT() {
+        return this.serialize(new NBTTagCompound());
+    }
+}

src/main/java/org/dimdev/rift/util/NBTSerializer.java

@@ -0,0 +1,27 @@
+package org.dimdev.rift.util;
+
+import net.minecraft.nbt.NBTTagCompound;
+
+import javax.annotation.Nonnull;
+
+/**
+ * Base interface for (de)serializing objects of type {@code T}
+ * to and from {@link NBTTagCompound} tag compounds
+ */
+public interface NBTSerializer<T> {
+    /**
+     * Writes an object {@code T} to the given compound
+     * @param instance The instance to be serialized
+     * @return The written tag compound
+     */
+    @Nonnull
+    NBTTagCompound serialize(@Nonnull T instance);
+
+    /**
+     * Reads an object {@code T} from the given compound
+     * @param compound The tag compound to be read from
+     * @return An instance of {@code T}
+     */
+    @Nonnull
+    T deserialize(@Nonnull NBTTagCompound compound);
+}