Implementing complex mapper

Author: Jonathan P Moraes

api/src/main/java/marquez/db/mappers/ComplexDatasetFieldPairMapper.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2018-2024 contributors to the Marquez project
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package marquez.db.mappers;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.UUID;
+import lombok.NonNull;
+import org.apache.commons.lang3.tuple.Pair;
+import org.jdbi.v3.core.mapper.RowMapper;
+import org.jdbi.v3.core.statement.StatementContext;
+
+public final class ComplexDatasetFieldPairMapper implements RowMapper<Pair<Pair<String, Pair<String, String>>, UUID>> {
+    @Override
+    public Pair<Pair<String, Pair<String, String>>, UUID> map(@NonNull ResultSet results, @NonNull StatementContext context)
+            throws SQLException {
+        // Map the columns to the complex Pair structure
+        String namespaceName = results.getString("namespace_name");
+        String datasetName = results.getString("dataset_name");
+        String fieldName = results.getString("name");
+        UUID uuid = results.getObject("uuid", UUID.class);
+
+        // Construct the nested Pair structure
+        Pair<String, String> datasetPair = Pair.of(datasetName, fieldName);
+        Pair<String, Pair<String, String>> identifierPair = Pair.of(namespaceName, datasetPair);
+        
+        // Return the final Pair with UUID
+        return Pair.of(identifierPair, uuid);
+    }
+}