first compile-clean attempt to integrate the layered I/O subsystem with the existing UI

main/frontend-api/.gitignore

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+/target/

main/frontend-api/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Copyright (c) 2016 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
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.cryptomator</groupId>
+		<artifactId>main</artifactId>
+		<version>0.11.0-SNAPSHOT</version>
+	</parent>
+	<artifactId>frontend-api</artifactId>
+	<name>Cryptomator frontend: API</name>
+	<description>API for filesystem frontends</description>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.cryptomator</groupId>
+			<artifactId>filesystem-api</artifactId>
+		</dependency>
+	</dependencies>
+</project>

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

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+package org.cryptomator.frontend;
+
+import java.util.Map;
+import java.util.Optional;
+
+public interface Frontend extends AutoCloseable {
+
+	public enum MountParam {
+		MOUNT_NAME, WIN_DRIVE_LETTER
+	}
+
+	boolean mount(Map<MountParam, Optional<String>> map);
+
+	void unmount();
+
+	void reveal();
+
+}

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

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+package org.cryptomator.frontend;
+
+public class FrontendCreationFailedException extends Exception {
+
+	public FrontendCreationFailedException(Throwable cause) {
+		super(cause);
+	}
+
+}

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

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+package org.cryptomator.frontend;
+
+import org.cryptomator.filesystem.Folder;
+
+public interface FrontendFactory {
+
+	/**
+	 * Provides a new frontend to access the given folder.
+	 * 
+	 * @param root Root resource accessible through this frontend.
+	 * @param uniqueName Name of the frontend, i.e. used to create subresources for the different frontends inside of a common virtual drive.
+	 * @return A new frontend
+	 * @throws FrontendCreationFailedException If creation was not possible.
+	 */
+	Frontend create(Folder root, String uniqueName) throws FrontendCreationFailedException;
+
+}

main/frontend-api/src/main/java/org/cryptomator/frontend/package-info.java

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+/*******************************************************************************
+ * Copyright (c) 2015 Sebastian Stenzel and others.
+ * 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
+ *******************************************************************************/
+/**
+ * Provides frontends for {@link org.cryptomator.filesystem.FileSystem FileSystems}.
+ */
+package org.cryptomator.frontend;