1 files changed, 61 insertions, 0 deletions

diff --git a/src/WixToolset.Core.WindowsInstaller/ExtensibilityServices/WindowsInstallerBackendHelper.cs b/src/WixToolset.Core.WindowsInstaller/ExtensibilityServices/WindowsInstallerBackendHelper.cs
new file mode 100644
index 00000000..a1df335c
--- /dev/null
+++ b/src/WixToolset.Core.WindowsInstaller/ExtensibilityServices/WindowsInstallerBackendHelper.cs
@@ -0,0 +1,61 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Core.WindowsInstaller.ExtensibilityServices
+{
+    using System.Linq;
+    using WixToolset.Data;
+    using WixToolset.Data.WindowsInstaller;
+    using WixToolset.Extensibility.Services;
+
+    internal class WindowsInstallerBackendHelper : IWindowsInstallerBackendHelper
+    {
+        public Row CreateRow(IntermediateSection section, IntermediateTuple tuple, WindowsInstallerData output, TableDefinition tableDefinition)
+        {
+            var table = output.EnsureTable(tableDefinition);
+
+            var row = table.CreateRow(tuple.SourceLineNumbers);
+            row.SectionId = section.Id;
+
+            return row;
+        }
+
+        public bool TryAddTupleToOutputMatchingTableDefinitions(IntermediateSection section, IntermediateTuple tuple, WindowsInstallerData output, TableDefinitionCollection tableDefinitions)
+        {
+            var tableDefinition = tableDefinitions.FirstOrDefault(t => t.TupleDefinition?.Name == tuple.Definition.Name);
+            if (tableDefinition == null)
+            {
+                return false;
+            }
+
+            var row = this.CreateRow(section, tuple, output, tableDefinition);
+            var rowOffset = 0;
+
+            if (tableDefinition.TupleIdIsPrimaryKey)
+            {
+                row[0] = tuple.Id.Id;
+                rowOffset = 1;
+            }
+
+            for (var i = 0; i < tuple.Fields.Length; ++i)
+            {
+                if (i < tableDefinition.Columns.Length)
+                {
+                    var column = tableDefinition.Columns[i + rowOffset];
+
+                    switch (column.Type)
+                    {
+                    case ColumnType.Number:
+                        row[i + rowOffset] = column.Nullable ? tuple.AsNullableNumber(i) : tuple.AsNumber(i);
+                        break;
+
+                    default:
+                        row[i + rowOffset] = tuple.AsString(i);
+                        break;
+                    }
+                }
+            }
+
+            return true;
+        }
+    }
+}