1 files changed, 87 insertions, 0 deletions

diff --git a/src/api/burn/WixToolset.BootstrapperApplicationApi/OverridableVariables.cs b/src/api/burn/WixToolset.BootstrapperApplicationApi/OverridableVariables.cs
new file mode 100644
index 00000000..98f8ec81
--- /dev/null
+++ b/src/api/burn/WixToolset.BootstrapperApplicationApi/OverridableVariables.cs
@@ -0,0 +1,87 @@
+// 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.BootstrapperApplicationApi
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Xml;
+    using System.Xml.XPath;
+
+    /// <summary>
+    /// Default implementation of <see cref="IOverridableVariables"/>.
+    /// </summary>
+    public class OverridableVariablesInfo : IOverridableVariables
+    {
+        /// <inheritdoc />
+        public VariableCommandLineType CommandLineType { get; internal set; }
+
+        /// <inheritdoc />
+        public IDictionary<string, IOverridableVariableInfo> Variables { get; internal set; }
+
+        internal OverridableVariablesInfo() { }
+
+        /// <summary>
+        /// Parses the overridable variable info from the BA manifest.
+        /// </summary>
+        /// <param name="root">XML root</param>
+        /// <returns>The parsed information.</returns>
+        public static IOverridableVariables ParseFromXml(XPathNavigator root)
+        {
+            XmlNamespaceManager namespaceManager = new XmlNamespaceManager(root.NameTable);
+            namespaceManager.AddNamespace("p", BootstrapperApplicationData.XMLNamespace);
+            XPathNavigator commandLineNode = root.SelectSingleNode("/p:BootstrapperApplicationData/p:WixStdbaCommandLine", namespaceManager);
+            XPathNodeIterator nodes = root.Select("/p:BootstrapperApplicationData/p:WixStdbaOverridableVariable", namespaceManager);
+
+            var overridableVariables = new OverridableVariablesInfo();
+            IEqualityComparer<string> variableNameComparer;
+
+            if (commandLineNode == null)
+            {
+                overridableVariables.CommandLineType = VariableCommandLineType.CaseSensitive;
+                variableNameComparer = StringComparer.InvariantCulture;
+            }
+            else
+            {
+                string variablesValue = BootstrapperApplicationData.GetAttribute(commandLineNode, "Variables");
+
+                if (variablesValue == null)
+                {
+                    throw new Exception("Failed to get command line variable type.");
+                }
+
+                if (variablesValue.Equals("caseInsensitive", StringComparison.InvariantCulture))
+                {
+                    overridableVariables.CommandLineType = VariableCommandLineType.CaseInsensitive;
+                    variableNameComparer = StringComparer.InvariantCultureIgnoreCase;
+                }
+                else if (variablesValue.Equals("caseSensitive", StringComparison.InvariantCulture))
+                {
+                    overridableVariables.CommandLineType = VariableCommandLineType.CaseSensitive;
+                    variableNameComparer = StringComparer.InvariantCulture;
+                }
+                else
+                {
+                    throw new Exception(String.Format("Unknown command line variable type: '{0}'", variablesValue));
+                }
+            }
+
+            overridableVariables.Variables = new Dictionary<string, IOverridableVariableInfo>(variableNameComparer);
+
+            foreach (XPathNavigator node in nodes)
+            {
+                var variable = new OverridableVariableInfo();
+
+                string name = BootstrapperApplicationData.GetAttribute(node, "Name");
+                if (name == null)
+                {
+                    throw new Exception("Failed to get name for overridable variable.");
+                }
+                variable.Name = name;
+
+                overridableVariables.Variables.Add(variable.Name, variable);
+            }
+
+            return overridableVariables;
+        }
+    }
+}