Basic implementation of World is realised.

src/main/java/ru/wpstuio/amorphine/mcaliases/World.java

@@ -1,11 +1,51 @@
 package ru.wpstuio.amorphine.mcaliases;
 
+import net.minecraft.world.level.chunk.storage.RegionFile;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
 import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
 
 /**
  * Created by amorphine on 21.11.16.
  */
 public class World {
-    private File save_dir;
+    private File world_dir;
+
+    private HashMap region_files = new HashMap<int[], File>();
+    private HashMap regions = new HashMap<int[], Region>();
+
+    public World(File world_dir) throws IOException {
+        this.world_dir = world_dir;
+        if (!world_dir.exists()) {
+            throw new IOException("Cannot access " + world_dir.getAbsolutePath() + ": No such file or directory");
+        }
+
+        String[] file_list = world_dir.list();
+        for(String file_name: file_list) {
+            if (file_name.endsWith(".mca")) {
+                String[] splitted_file_name = file_name.split("\\.");
+                if (splitted_file_name.length < 4) {
+                    continue;
+                }
+
+                String path_to_region = world_dir.getAbsolutePath() + "/" + file_name;
+                File region_file = new File(path_to_region);
+
+                int[] cords = {
+                        Integer.parseInt(splitted_file_name[1]),
+                        Integer.parseInt(splitted_file_name[2])
+                };
+                region_files.put(cords, region_file);
+
+                RegionFile rg_file = new RegionFile(region_file);
+                Region region = new Region(rg_file);
+                regions.put(cords, region);
+            }
+        }
+    }
 
 }

src/test/java/TestWorld.java

@@ -1,8 +1,6 @@
 /**
  * Created by amorphine on 23.11.16.
  */
-import static com.sun.javafx.PlatformUtil.isWindows;
-import static org.junit.Assert.*;
 
 import com.mojang.nbt.NbtIo;
 import net.minecraft.world.level.chunk.storage.RegionFile;
@@ -11,16 +9,29 @@
 import org.junit.Test;
 import ru.wpstuio.amorphine.mcaliases.Chunk;
 import ru.wpstuio.amorphine.mcaliases.Region;
+import ru.wpstuio.amorphine.mcaliases.World;
 
 import java.io.DataOutputStream;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
 public class TestWorld {
     @Test
     public void testAdd() {
 
+        World world;
+
+        try {
+            world = new World(new File ("/home/amorphine/mine-thermos/world/region"));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        /*
         String path_to_local_ini = "local_presets.ini";
         String path_to_ini = "presets.ini";
 
@@ -65,5 +76,6 @@ public void testAdd() {
 
         byte result = chunks[31][0].getBlockId(-3, 64, 6);
         assertTrue(id_to_make == result);
+        */
     }
 }