IStorageProvider FileExists() and FolderExists()

--HG--
branch : 1.x
extra : rebase_source : 89792dec51c9419263c469998810cb95d6a2c050

src/Orchard.Tests/Storage/FileSystemStorageProviderTests.cs

@@ -57,6 +57,16 @@ namespace Orchard.Tests.Storage {
         private string _folderPath;
         private IStorageProvider _storageProvider;
 
+        [Test]
+        public void ExistsShouldBeTrueForExtistingFile() {
+            Assert.That(_storageProvider.FileExists("testfile.txt"), Is.True);
+        }
+
+        [Test]
+        public void ExistsShouldBeFalseForNonExtistingFile() {
+            Assert.That(_storageProvider.FileExists("notexisting"), Is.False);
+        }
+
         [Test]
         [ExpectedException(typeof(ArgumentException))]
         public void GetFileThatDoesNotExistShouldThrow() {
@@ -99,6 +109,16 @@ namespace Orchard.Tests.Storage {
             Assert.That(file2.GetPath(), Is.EqualTo("Subfolder1" + Path.DirectorySeparatorChar + "one.txt"));
         }
 
+        [Test]
+        public void ExistsShouldBeTrueForExtistingFolder() {
+            Assert.That(_storageProvider.FolderExists("Subfolder1"), Is.True);
+        }
+
+        [Test]
+        public void ExistsShouldBeFalseForNonExtistingFolder() {
+            Assert.That(_storageProvider.FolderExists("notexisting"), Is.False);
+        }
+
         [Test]
         public void ListFoldersReturnsItemsWithShortPathAndEnvironmentSlashes() {
             var folders = _storageProvider.ListFolders(@"Subfolder1");

src/Orchard/FileSystems/Media/IStorageProvider.cs

@@ -4,6 +4,13 @@ using System.IO;
 
 namespace Orchard.FileSystems.Media {
     public interface IStorageProvider : IDependency {
+        /// <summary>
+        /// Checks if the given file exists within the storage provider.
+        /// </summary>
+        /// <param name="path">The relative path within the storage provider.</param>
+        /// <returns>True if the file exists; False otherwise.</returns>
+        bool FileExists(string path);
+
         /// <summary>
         /// Retrieves the public URL for a given file within the storage provider.
         /// </summary>
@@ -26,6 +33,13 @@ namespace Orchard.FileSystems.Media {
         /// <returns>The list of files in the folder.</returns>
         IEnumerable<IStorageFile> ListFiles(string path);
 
+        /// <summary>
+        /// Checks if the given folder exists within the storage provider.
+        /// </summary>
+        /// <param name="path">The relative path within the storage provider.</param>
+        /// <returns>True if the folder exists; False otherwise.</returns>
+        bool FolderExists(string path);
+
         /// <summary>
         /// Lists the folders within a storage provider's path.
         /// </summary>