1 files changed, 94 insertions, 0 deletions

diff --git a/src/WixToolset.Extensibility/BaseBurnBackendBinderExtension.cs b/src/WixToolset.Extensibility/BaseBurnBackendBinderExtension.cs
new file mode 100644
index 00000000..3afc8678
--- /dev/null
+++ b/src/WixToolset.Extensibility/BaseBurnBackendBinderExtension.cs
@@ -0,0 +1,94 @@
+// 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.Extensibility
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using WixToolset.Data;
+    using WixToolset.Data.Burn;
+    using WixToolset.Extensibility.Data;
+    using WixToolset.Extensibility.Services;
+
+    /// <summary>
+    /// Base class for creating a Burn backend extension.
+    /// </summary>
+    public abstract class BaseBurnBackendBinderExtension : IBurnBackendBinderExtension
+    {
+        /// <summary>
+        /// Context for use by the extension.
+        /// </summary>
+        protected IBindContext Context { get; private set; }
+
+        /// <summary>
+        /// Messaging for use by the extension.
+        /// </summary>
+        protected IMessaging Messaging { get; private set; }
+
+        /// <summary>
+        /// Backend helper for use by the extension.
+        /// </summary>
+        protected IBurnBackendHelper BackendHelper { get; private set; }
+
+        /// <summary>
+        /// Optional symbol definitions.
+        /// </summary>
+        protected virtual IEnumerable<IntermediateSymbolDefinition> SymbolDefinitions => Enumerable.Empty<IntermediateSymbolDefinition>();
+
+        /// <summary>
+        /// See <see cref="IBurnBackendBinderExtension.PreBackendBind(IBindContext)"/>
+        /// </summary>
+        public virtual void PreBackendBind(IBindContext context)
+        {
+            this.Context = context;
+            this.Messaging = context.ServiceProvider.GetService<IMessaging>();
+            this.BackendHelper = context.ServiceProvider.GetService<IBurnBackendHelper>();
+        }
+
+        /// <summary>
+        /// See <see cref="IBurnBackendBinderExtension.ResolveRelatedFile(String, String, String, SourceLineNumber)"/>
+        /// </summary>
+        public virtual IResolveFileResult ResolveRelatedFile(string source, string relatedSource, string type, SourceLineNumber sourceLineNumbers)
+        {
+            return null;
+        }
+
+        /// <summary>
+        /// See <see cref="IBurnBackendBinderExtension.SymbolsFinalized(IntermediateSection)"/>
+        /// </summary>
+        public virtual void SymbolsFinalized(IntermediateSection section)
+        {
+        }
+
+        /// <summary>
+        /// See <see cref="IBurnBackendBinderExtension.ResolveUrl(String, String, String, String, String)"/>
+        /// </summary>
+        public virtual string ResolveUrl(string url, string fallbackUrl, string packageId, string payloadId, string fileName)
+        {
+            return null;
+        }
+
+        /// <summary>
+        /// See <see cref="IBurnBackendBinderExtension.TryProcessSymbol(IntermediateSection, IntermediateSymbol)"/>
+        /// </summary>
+        public virtual bool TryProcessSymbol(IntermediateSection section, IntermediateSymbol symbol)
+        {
+            if (this.SymbolDefinitions.Any(t => t == symbol.Definition) &&
+                symbol.Definition.HasTag(BurnConstants.BootstrapperApplicationDataSymbolDefinitionTag))
+            {
+                this.BackendHelper.AddBootstrapperApplicationData(symbol);
+                return true;
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// See <see cref="IBurnBackendBinderExtension.PostBackendBind(IBindResult)"/>
+        /// </summary>
+        /// <param name="result"></param>
+        public virtual void PostBackendBind(IBindResult result)
+        {
+        }
+    }
+}