From 6a6d04706e0f050173f6e347af2491760c6696e7 Mon Sep 17 00:00:00 2001
From: KY <kai@ky-programming.de>
Date: Mon, 9 May 2022 15:29:08 +0200
Subject: [PATCH] - FileSystem watch added - FileSystemWatcherExtension added -
 FileSystem get last write date added

---
 .../DataAccess/DirectoryHelper.cs             | 16 ++++++-
 Core.Common.Standard/DataAccess/FileHelper.cs | 21 +++++++++-
 Core.Common.Standard/DataAccess/FileSystem.cs | 32 +++++++++++++-
 .../Extension/FileSystemWatcherExtension.cs   | 42 +++++++++++++++++++
 4 files changed, 106 insertions(+), 5 deletions(-)
 create mode 100644 Core.Common.Standard/Extension/FileSystemWatcherExtension.cs

diff --git a/Core.Common.Standard/DataAccess/DirectoryHelper.cs b/Core.Common.Standard/DataAccess/DirectoryHelper.cs
index 1cd2fbf..3c82a87 100644
--- a/Core.Common.Standard/DataAccess/DirectoryHelper.cs
+++ b/Core.Common.Standard/DataAccess/DirectoryHelper.cs
@@ -1,3 +1,4 @@
+using System;
 using System.IO;
 using System.Text.RegularExpressions;
 
@@ -93,5 +94,18 @@ public string GetName(string directory)
         {
             return Path.GetDirectoryName(directory);
         }
+
+        public FileSystemWatcher Watch(string path)
+        {
+            string absolutePath = this.pathHelper.ToAbsolute(path);
+            FileSystemWatcher watchdog = new (absolutePath);
+            watchdog.EnableRaisingEvents = true;
+            return watchdog;
+        }
+
+        public DateTime GetLastWriteTime(params string[] pathChunks)
+        {
+            return Directory.GetLastWriteTime(this.pathHelper.ToAbsolute(pathChunks));
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/Core.Common.Standard/DataAccess/FileHelper.cs b/Core.Common.Standard/DataAccess/FileHelper.cs
index d6f63eb..d3dd45f 100644
--- a/Core.Common.Standard/DataAccess/FileHelper.cs
+++ b/Core.Common.Standard/DataAccess/FileHelper.cs
@@ -1,4 +1,5 @@
-using System.IO;
+using System;
+using System.IO;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Xml.Linq;
@@ -175,5 +176,21 @@ public string GetName(string path)
         {
             return Path.GetFileName(path);
         }
+
+        public FileSystemWatcher Watch(string path)
+        {
+            string absolutePath = FileSystem.ToAbsolutePath(path);
+            string directory = FileSystem.GetDirectoryName(absolutePath);
+            string file = FileSystem.GetFileName(absolutePath);
+            FileSystemWatcher watchdog = new (directory);
+            watchdog.Filter = file;
+            watchdog.EnableRaisingEvents = true;
+            return watchdog;
+        }
+
+        public DateTime GetLastWriteTime(params string[] pathChunks)
+        {
+            return File.GetLastWriteTime(this.pathHelper.ToAbsolute(pathChunks));
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/Core.Common.Standard/DataAccess/FileSystem.cs b/Core.Common.Standard/DataAccess/FileSystem.cs
index b379d7b..302f35d 100644
--- a/Core.Common.Standard/DataAccess/FileSystem.cs
+++ b/Core.Common.Standard/DataAccess/FileSystem.cs
@@ -1,4 +1,5 @@
-using System.IO;
+using System;
+using System.IO;
 using System.Reflection;
 using System.Text;
 using System.Xml.Linq;
@@ -203,9 +204,36 @@ public static string ToDirectory(string directory)
             return directoryHelper.ToDirectory(directory);
         }
 
+        public static string GetDirectoryName(string path)
+        {
+            return directoryHelper.GetName(path);
+        }
+
         public static string GetFileName(string path)
         {
             return fileHelper.GetName(path);
         }
+
+        public static FileSystemWatcher Watch(string path)
+        {
+            if (DirectoryExists(path))
+            {
+                return directoryHelper.Watch(path);
+            }
+            if (FileExists(path))
+            {
+                return fileHelper.Watch(path);
+            }
+            throw new InvalidOperationException($"Can not watch file or directory '{path}': Not found.");
+        }
+
+        public static DateTime GetLastWriteTime(params string[] pathChunks)
+        {
+            if (DirectoryExists(pathChunks))
+            {
+                return directoryHelper.GetLastWriteTime(pathChunks);
+            }
+            return fileHelper.GetLastWriteTime(pathChunks);
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/Core.Common.Standard/Extension/FileSystemWatcherExtension.cs b/Core.Common.Standard/Extension/FileSystemWatcherExtension.cs
new file mode 100644
index 0000000..34496de
--- /dev/null
+++ b/Core.Common.Standard/Extension/FileSystemWatcherExtension.cs
@@ -0,0 +1,42 @@
+using System.IO;
+
+namespace KY.Core.Extension;
+
+public static class FileSystemWatcherExtension
+{
+    public static FileSystemWatcher OnChanged(this FileSystemWatcher watcher, FileSystemEventHandler handler)
+    {
+        watcher.Changed += handler;
+        return watcher;
+    }
+
+    public static FileSystemWatcher OnCreated(this FileSystemWatcher watcher, FileSystemEventHandler handler)
+    {
+        watcher.Created += handler;
+        return watcher;
+    }
+
+    public static FileSystemWatcher OnDeleted(this FileSystemWatcher watcher, FileSystemEventHandler handler)
+    {
+        watcher.Deleted += handler;
+        return watcher;
+    }
+
+    public static FileSystemWatcher OnRenamed(this FileSystemWatcher watcher, RenamedEventHandler handler)
+    {
+        watcher.Renamed += handler;
+        return watcher;
+    }
+
+    public static FileSystemWatcher OnError(this FileSystemWatcher watcher, ErrorEventHandler handler)
+    {
+        watcher.Error += handler;
+        return watcher;
+    }
+
+    public static FileSystemWatcher IncludeSubdirectories (this FileSystemWatcher watcher)
+    {
+        watcher.IncludeSubdirectories = true;
+        return watcher;
+    }
+}