Create utility functions for updating state and getting last transact…

…ion number

java/core/src/main/java/sleeper/core/statestore/transactionlog/TransactionLogSnapshotUtils.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2022-2024 Crown Copyright
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package sleeper.core.statestore.transactionlog;
+
+import sleeper.core.statestore.StateStoreException;
+import sleeper.core.table.TableStatus;
+
+public class TransactionLogSnapshotUtils {
+    private TransactionLogSnapshotUtils() {
+    }
+
+    public static long updateFilesState(
+            TableStatus table, StateStorePartitions state, TransactionLogStore store, long lastTransactionNumber) throws StateStoreException {
+        return updateState(TransactionLogHead.builder().forPartitions()
+                .lastTransactionNumber(lastTransactionNumber)
+                .logStore(store)
+                .sleeperTable(table)
+                .state(state)
+                .build());
+    }
+
+    public static long updatePartitionsState(
+            TableStatus table, StateStoreFiles state, TransactionLogStore store, long lastTransactionNumber) throws StateStoreException {
+        return updateState(TransactionLogHead.builder().forFiles()
+                .lastTransactionNumber(lastTransactionNumber)
+                .logStore(store)
+                .sleeperTable(table)
+                .state(state)
+                .build());
+    }
+
+    private static long updateState(TransactionLogHead<?> head) throws StateStoreException {
+        head.update();
+        return head.lastTransactionNumber();
+    }
+}