From 6a287efc0cdb9138aa54f0efb339ab746ba98ec0 Mon Sep 17 00:00:00 2001
From: Gabriel Einsdorf <gabriel.einsdorf@uni-konstanz.de>
Date: Sun, 6 May 2018 15:12:56 +0200
Subject: [PATCH] DataHandleService: Add a method to check if the source of a
 handle exists.

---
 .../org/scijava/io/handle/DataHandleService.java | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/main/java/org/scijava/io/handle/DataHandleService.java b/src/main/java/org/scijava/io/handle/DataHandleService.java
index 97175e4d9..5d4f1a77e 100644
--- a/src/main/java/org/scijava/io/handle/DataHandleService.java
+++ b/src/main/java/org/scijava/io/handle/DataHandleService.java
@@ -32,6 +32,8 @@
 
 package org.scijava.io.handle;
 
+import java.io.IOException;
+
 import org.scijava.io.IOService;
 import org.scijava.io.location.Location;
 import org.scijava.plugin.WrapperService;
@@ -63,4 +65,18 @@ default Class<DataHandle<Location>> getPluginType() {
 	default Class<Location> getType() {
 		return Location.class;
 	}
+
+	/**
+	 * Convenience method to test whether it describes an existing file.
+	 *
+	 * @param location the location to test
+	 * @return The result of {@link DataHandle#exists()} on a newly created handle
+	 *         on this location
+	 * @throws IOException
+	 */
+	default boolean exists(final Location location) throws IOException {
+		try (DataHandle<Location> handle = create(location)) {
+			return handle.exists();
+		}
+	}
 }