Pow3r: stage 1 (#4208)

Co-authored-by: 20kdc <asdd2808@gmail.com>

Content.Server/Power/NodeGroups/BaseNetConnectorNodeGroup.cs

@@ -0,0 +1,34 @@
+#nullable enable
+using System.Collections.Generic;
+using System.Linq;
+using Content.Server.NodeContainer.NodeGroups;
+using Content.Server.NodeContainer.Nodes;
+using Content.Server.Power.Components;
+
+namespace Content.Server.Power.NodeGroups
+{
+    public abstract class BaseNetConnectorNodeGroup<TNetConnector, TNetType> : BaseNodeGroup
+        where TNetConnector : BaseNetConnectorComponent<TNetType>
+    {
+        public override void LoadNodes(List<Node> groupNodes)
+        {
+            base.LoadNodes(groupNodes);
+
+            foreach (var node in groupNodes)
+            {
+                var newNetConnectorComponents = node.Owner
+                    .GetAllComponents<TNetConnector>()
+                    .Where(powerComp => (powerComp.NodeId == null || powerComp.NodeId == node.Name) &&
+                                        (NodeGroupID) powerComp.Voltage == node.NodeGroupID)
+                    .ToList();
+
+                foreach (var netConnector in newNetConnectorComponents)
+                {
+                    SetNetConnectorNet(netConnector);
+                }
+            }
+        }
+
+        protected abstract void SetNetConnectorNet(TNetConnector netConnectorComponent);
+    }
+}