exception handling during mount/unmount/reveal operations

main/frontend-api/src/main/java/org/cryptomator/frontend/CommandFailedException.java

@@ -0,0 +1,24 @@
+/*******************************************************************************
+ * Copyright (c) 2014 Sebastian Stenzel
+ * This file is licensed under the terms of the MIT license.
+ * See the LICENSE.txt file for more info.
+ * 
+ * Contributors:
+ *     Sebastian Stenzel - initial API and implementation
+ *     Markus Kreusch - Refactored WebDavMounter to use strategy pattern
+ ******************************************************************************/
+package org.cryptomator.frontend;
+
+public class CommandFailedException extends Exception {
+
+	private static final long serialVersionUID = 5784853630182321479L;
+
+	public CommandFailedException(String message) {
+		super(message);
+	}
+
+	public CommandFailedException(Throwable cause) {
+		super(cause);
+	}
+
+}

main/frontend-api/src/main/java/org/cryptomator/frontend/Frontend.java

@@ -9,10 +9,10 @@ public interface Frontend extends AutoCloseable {
 		MOUNT_NAME, WIN_DRIVE_LETTER
 	}
 
-	boolean mount(Map<MountParam, Optional<String>> map);
+	void mount(Map<MountParam, Optional<String>> map) throws CommandFailedException;
 
-	void unmount();
+	void unmount() throws CommandFailedException;
 
-	void reveal();
+	void reveal() throws CommandFailedException;
 
 }