1 files changed, 45 insertions, 0 deletions
diff --git a/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/billing/InvoiceUpdate.java b/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/billing/InvoiceUpdate.java
new file mode 100644
index 00000000000..6ca3cf6ebb1
--- /dev/null
+++ b/controller-api/src/main/java/com/yahoo/vespa/hosted/controller/api/integration/billing/InvoiceUpdate.java
@@ -0,0 +1,45 @@
+package com.yahoo.vespa.hosted.controller.api.integration.billing;
+
+/**
+ * Helper to track changes to an invoice.
+ *
+ * @author gjoranv
+ */
+public record InvoiceUpdate(int itemsAdded, int itemsRemoved, int itemsModified) {
+    public boolean isEmpty() {
+        return itemsAdded == 0 && itemsRemoved == 0 && itemsModified == 0;
+    }
+
+    public static InvoiceUpdate empty() {
+        return new InvoiceUpdate(0, 0, 0);
+    }
+
+    public static class Counter {
+        private int itemsAdded = 0;
+        private int itemsRemoved = 0;
+        private int itemsModified = 0;
+
+        public void addedItem() {
+            itemsAdded++;
+        }
+
+        public void removedItem() {
+            itemsRemoved++;
+        }
+
+        public void modifiedItem() {
+            itemsModified++;
+        }
+
+        public void add(InvoiceUpdate other) {
+            itemsAdded += other.itemsAdded;
+            itemsRemoved += other.itemsRemoved;
+            itemsModified += other.itemsModified;
+        }
+
+        public InvoiceUpdate finish() {
+            return new InvoiceUpdate(itemsAdded, itemsRemoved, itemsModified);
+        }
+    }
+
+}