1 files changed, 38 insertions, 0 deletions
diff --git a/src/main/java/gregtech/api/graphs/Lock.java b/src/main/java/gregtech/api/graphs/Lock.java
new file mode 100644
index 0000000000..d3c8c49169
--- /dev/null
+++ b/src/main/java/gregtech/api/graphs/Lock.java
@@ -0,0 +1,38 @@
+package gregtech.api.graphs;
+
+import java.util.ArrayList;
+
+import net.minecraft.tileentity.TileEntity;
+
+public class Lock {
+
+    protected ArrayList<TileEntity> tiles = new ArrayList<>();
+
+    public void addTileEntity(TileEntity tileEntity) {
+        int i = contains(tileEntity);
+        if (i == -1) {
+            tiles.add(tileEntity);
+        }
+    }
+
+    public void removeTileEntity(TileEntity tileEntity) {
+        int i = contains(tileEntity);
+        if (i > -1) {
+            tiles.remove(i);
+        }
+    }
+
+    public boolean isLocked() {
+        return !tiles.isEmpty();
+    }
+
+    // i want to check for the exact object not equals
+    protected int contains(TileEntity tileEntity) {
+        for (int i = 0; i < tiles.size(); i++) {
+            if (tiles.get(i) == tileEntity) {
+                return i;
+            }
+        }
+        return -1;
+    }
+}