add TilePrefabLoader

src/com/blarg/gdx/tilemap3d/prefabs/json/TilePrefabLoader.java

@@ -0,0 +1,32 @@
+package com.blarg.gdx.tilemap3d.prefabs.json;
+
+import com.badlogic.gdx.files.FileHandle;
+import com.badlogic.gdx.utils.Base64Coder;
+import com.badlogic.gdx.utils.Json;
+import com.blarg.gdx.Strings;
+import com.blarg.gdx.tilemap3d.json.TileDataSerializer;
+import com.blarg.gdx.tilemap3d.prefabs.TilePrefab;
+
+import java.nio.ByteBuffer;
+
+public class TilePrefabLoader {
+	public static TilePrefab load(FileHandle prefabFile) {
+		if (prefabFile == null)
+			throw new IllegalArgumentException();
+
+		Json json = new Json();
+		JsonTilePrefab jsonPrefab = json.fromJson(JsonTilePrefab.class, prefabFile);
+
+		if (Strings.isNullOrEmpty(jsonPrefab.data))
+			throw new RuntimeException("Invalid prefab: no tile data.");
+
+		TilePrefab prefab = new TilePrefab(jsonPrefab.width, jsonPrefab.height, jsonPrefab.depth);
+
+		byte[] dataBytes = Base64Coder.decode(jsonPrefab.data);
+		ByteBuffer buffer = ByteBuffer.wrap(dataBytes);
+
+		TileDataSerializer.deserialize(buffer, prefab);
+
+		return prefab;
+	}
+}