read a .we minetest schema

- use ground has maze walls

java/org/artisanlogiciel/games/minetest/World.java

@@ -0,0 +1,79 @@
+package org.artisanlogiciel.games.minetest;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+public class World
+    extends Range
+{
+
+    List<Node> nodes;
+
+    // z range
+    HashMap<Integer,Slice> zSlices;
+
+    public World()
+    {
+        super();
+        nodes = new ArrayList<>();
+        zSlices = new HashMap<>();
+    }
+
+    public void addNode(Node node)
+    {
+        nodes.add(node);
+        addNodeInSlice(new Integer(node.getZ()),node);
+    }
+
+    private void addNodeInSlice(Integer z, Node node) {
+        updateBounds(z.intValue());
+        Slice s = zSlices.get(z);
+        Integer x = new Integer(node.getX());
+        if ( s == null )
+        {
+            s = new Slice();
+            zSlices.put(z,s);
+        }
+        s.addNodeInRaw(x,node);
+
+    }
+
+    public void addList(List<Object> objectList)
+    {
+        for (Object o : objectList)
+        {
+            if ( o instanceof HashMap )
+            {
+                HashMap<String,Object> map = (HashMap<String,Object>) o;
+                Node node = new Node(map);
+                addNode(node);
+            }
+        }
+    }
+
+    public Node getNode(int x, int y, int z)
+    {
+        Slice s = zSlices.get(new Integer(z));
+        if ( s == null )
+        {
+            return null;
+        }
+        else
+        {
+            return s.getNode(x,y);
+        }
+    }
+
+    public Slice getSlice(int z)
+    {
+        return zSlices.get(new Integer(z));
+    }
+
+    @Override
+    public String toString() {
+        return "World{" +
+                "nodes=" + nodes +
+                '}';
+    }
+}