added comments to IUnpackHelper

src/Umbraco.Core/Packaging/IUnpackHelper.cs

@@ -2,11 +2,46 @@
 
 namespace Umbraco.Core.Packaging
 {
+    /// <summary>
+    /// Used to access an umbraco package file
+    /// Remeber that filenames must be unique
+    /// use "FindDubletFileNames" for sanitycheck
+    /// </summary>
     public interface IUnpackHelper
     {
+        /// <summary>
+        /// Returns the content of the file with the given filename
+        /// </summary>
+        /// <param name="packageFilePath">Full path to the ubraco package file</param>
+        /// <param name="fileToRead">filename of the file for wich to get the text content</param>
+        /// <param name="directoryInPackage">this is the relative directory for the location of the file in the package
+        /// I dont know why umbraco packages contains directories in the first place??</param>
+        /// <returns>text content of the file</returns>
         string ReadTextFileFromArchive(string packageFilePath, string fileToRead, out string directoryInPackage);
+
+        /// <summary>
+        /// Copies a file from package to given destination
+        /// </summary>
+        /// <param name="packageFilePath">Full path to the ubraco package file</param>
+        /// <param name="fileInPackageName">filename of the file to copy</param>
+        /// <param name="destinationfilePath">destination path (including destination filename)</param>
+        /// <returns>True a file was overwritten</returns>
         bool CopyFileFromArchive(string packageFilePath, string fileInPackageName, string destinationfilePath);
+
+        /// <summary>
+        /// Check if given list of files can be found in the package
+        /// </summary>
+        /// <param name="packageFilePath">Full path to the ubraco package file</param>
+        /// <param name="expectedFiles">a list of files you would like to find in the package</param>
+        /// <returns>a subset if any of the files in "expectedFiles" that could not be found in the package</returns>
         IEnumerable<string> FindMissingFiles(string packageFilePath, IEnumerable<string> expectedFiles);
+
+
+        /// <summary>
+        /// Sanitycheck - should return en empty collection if package is valid
+        /// </summary>
+        /// <param name="packageFilePath">Full path to the ubraco package file</param>
+        /// <returns>list of files that can are found more than ones (accross directories) in the package</returns>
         IEnumerable<string> FindDubletFileNames(string packageFilePath);
 
     }