Add and use CustomOutputFile

MPF.Processors/CustomOutputFile.cs

@@ -0,0 +1,92 @@
+using System;
+using System.IO;
+#if NET452_OR_GREATER || NETCOREAPP
+using System.IO.Compression;
+#endif
+using System.Linq;
+
+namespace MPF.Processors
+{
+    /// <summary>
+    /// Represents a single output file with custom detection rules
+    /// </summary>
+    public class CustomOutputFile : OutputFile
+    {
+        /// <summary>
+        /// Optional func for determining if a file exists
+        /// </summary>
+        private readonly Func<string, bool> _existsFunc;
+
+        /// <summary>
+        /// Create an OutputFile with a single filename
+        /// </summary>
+        public CustomOutputFile(string filename, OutputFileFlags flags, Func<string, bool> existsFunc)
+            : base([filename], flags)
+        {
+            _existsFunc = existsFunc;
+        }
+
+        /// <summary>
+        /// Create an OutputFile with a single filename
+        /// </summary>
+        public CustomOutputFile(string filename, OutputFileFlags flags, string artifactKey, Func<string, bool> existsFunc)
+            : base([filename], flags, artifactKey)
+        {
+            _existsFunc = existsFunc;
+        }
+
+        /// <summary>
+        /// Create an OutputFile with set of filenames
+        /// </summary>
+        public CustomOutputFile(string[] filenames, OutputFileFlags flags, Func<string, bool> existsFunc)
+            : base(filenames, flags)
+        {
+            _existsFunc = existsFunc;
+        }
+
+        /// <summary>
+        /// Create an OutputFile with set of filenames
+        /// </summary>
+        public CustomOutputFile(string[] filenames, OutputFileFlags flags, string artifactKey, Func<string, bool> existsFunc)
+            : base(filenames, flags, artifactKey)
+        {
+            _existsFunc = existsFunc;
+        }
+
+        /// <summary>
+        /// Indicates if an output file exists in a base directory
+        /// </summary>
+        /// <param name="baseDirectory">Base directory to check in</param>
+        public override bool Exists(string baseDirectory)
+        {
+            foreach (string filename in Filenames)
+            {
+                // Check for invalid filenames
+                if (string.IsNullOrEmpty(filename))
+                    continue;
+
+                try
+                {
+                    string possiblePath = Path.Combine(baseDirectory, filename);
+                    if (_existsFunc(possiblePath))
+                        return true;
+                }
+                catch { }
+            }
+
+            return false;
+        }
+
+#if NET452_OR_GREATER || NETCOREAPP
+        /// <summary>
+        /// Indicates if an output file exists in an archive
+        /// </summary>
+        /// <param name="archive">Zip archive to check in</param>
+        public override bool Exists(ZipArchive? archive)
+        {
+            // Files aren't extracted so this check can't be done
+            return false;
+        }
+#endif
+    }
+}