From 70ca62beff8528612a80952b65e909f58ebbc0fd Mon Sep 17 00:00:00 2001
From: Tuukka Lehtonen <tuukka.lehtonen@semantum.fi>
Date: Mon, 20 Mar 2017 13:59:02 +0200
Subject: [PATCH] Added functional FileOperation interface to FileService.

This makes using method references with FileService easier/possible and
provides for cleaner code.

refs #7100

Change-Id: I6929654b5f9d41cbad9fe4b35b2219d91e64a791
---
 .../src/org/simantics/utils/FileService.java  | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/bundles/org.simantics.utils/src/org/simantics/utils/FileService.java b/bundles/org.simantics.utils/src/org/simantics/utils/FileService.java
index c500c6635..ab3d249d3 100644
--- a/bundles/org.simantics.utils/src/org/simantics/utils/FileService.java
+++ b/bundles/org.simantics.utils/src/org/simantics/utils/FileService.java
@@ -22,6 +22,31 @@ public interface FileService {
 		}
 	}
 
+	@FunctionalInterface
+	public static interface FileOperation {
+		IOperation<Boolean, IOException> perform(File file);
+
+		default void perform(File... files) {
+			for (File f : files)
+				perform(f);
+		}
+	}
+
+	public static class DeleteOperation implements FileOperation {
+		private final FileService service;
+		private final DeleteOption[] options;
+
+		public DeleteOperation(FileService service, DeleteOption... options) {
+			this.service = service;
+			this.options = options;
+		}
+
+		@Override
+		public IOperation<Boolean, IOException> perform(File file) {
+			return service.scheduleDeleteIfExists(file, options);
+		}
+	}
+
 	/**
 	 * Schedules a file to be deleted at some point in the future when the
 	 * system allows it to be deleted if ever.
@@ -33,4 +58,16 @@ public interface FileService {
 	 */
 	IOperation<Boolean, IOException> scheduleDeleteIfExists(File file, DeleteOption... options);
 
+	/**
+	 * @param options
+	 *            the deletion options to be used by the returned FileOperation
+	 * @return a FileOperation that runs
+	 *         {@link #scheduleDeleteIfExists(File, DeleteOption...)} for any
+	 *         files given to it
+	 * @since 1.28.0
+	 */
+	default FileOperation deleteOperation(DeleteOption... options) {
+		return new DeleteOperation(this, options);
+	}
+
 }
-- 
2.43.2