Second stage: Completed

MapsCollection.java

@@ -0,0 +1,33 @@
+import java.util.HashMap;
+import java.util.Set;
+
+public class MapsCollection {
+    private final HashMap<String, MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap>> _mapsStorage;
+
+    private final int _pictureWidth;
+    private final int _pictureHeight;
+
+    public Set<String> getKeys() {
+        return _mapsStorage.keySet();
+    }
+
+    public MapsCollection(int pictureWidth, int pictureHeight) {
+        _mapsStorage = new HashMap<>();
+        _pictureWidth = pictureWidth;
+        _pictureHeight = pictureHeight;
+    }
+
+    public void addMap(String name, AbstractMap map) {
+        if (!_mapsStorage.containsKey(name)) {
+            _mapsStorage.put(name, new MapWithSetArtilleriesGeneric<>(_pictureWidth, _pictureHeight, map));
+        }
+    }
+
+    public void deleteMap(String name) {
+        _mapsStorage.remove(name);
+    }
+
+    public MapWithSetArtilleriesGeneric<DrawingObjectArtillery, AbstractMap> getMap(String name) {
+        return _mapsStorage.getOrDefault(name, null);
+    }
+}