read a .we minetest schema

- use ground has maze walls

java/org/artisanlogiciel/games/minetest/Node.java

@@ -1,5 +1,7 @@
 package org.artisanlogiciel.games.minetest;
 
+import java.util.HashMap;
+
 public class Node {
     int x;
     int y;
@@ -20,6 +22,16 @@ public class Node {
         this.material = Material.DEFAULT;
     }
 
+    public Node(HashMap<String, Object> map)
+            throws ClassCastException, NullPointerException
+    {
+        // FIXME WARNING HACK reverse x and z ...
+        x = ((Integer) map.get("x")).intValue();
+        y = ((Integer) map.get("z")).intValue();
+        z = ((Integer) map.get("y")).intValue();
+        material = Material.getMaterialByName( (String) map.get("name"));
+    }
+
     public int getX() {
         return x;
     }
@@ -35,4 +47,14 @@ public class Node {
     public Material getMaterial() {
         return material;
     }
+
+    @Override
+    public String toString() {
+        return "Node{" +
+                "x=" + x +
+                ", y=" + y +
+                ", z=" + z +
+                ", material=" + material +
+                '}';
+    }
 }