Redefined IllegalMountPointException and MountPointPreparationException

src/main/java/org/cryptomator/common/mount/IllegalMountPointException.java

@@ -1,9 +1,27 @@
 package org.cryptomator.common.mount;
 
+import java.nio.file.Path;
+
+/**
+ * Indicates that validation or preparation of a mountpoint failed due to a configuration error or an invalid system state.<br>
+ * Instances of this exception are usually caught and displayed to the user in an appropriate fashion, e.g. by {@link org.cryptomator.ui.unlock.UnlockInvalidMountPointController UnlockInvalidMountPointController.}
+ *
+ * @see MountPointPreparationException MountPointPreparationException for wrapping exceptions which occur while preparing the mountpoint.
+ */
 public class IllegalMountPointException extends IllegalArgumentException {
 
-	public IllegalMountPointException(String msg) {
+	private final Path mountpoint;
+
+	public IllegalMountPointException(Path mountpoint) {
+		this(mountpoint, "The provided mountpoint has a problem: " + mountpoint.toString());
+	}
+
+	public IllegalMountPointException(Path mountpoint, String msg) {
 		super(msg);
+		this.mountpoint = mountpoint;
 	}
 
-}
+	public Path getMountpoint() {
+		return mountpoint;
+	}
+}

src/main/java/org/cryptomator/common/mount/MountPointInUseException.java

@@ -1,8 +1,10 @@
 package org.cryptomator.common.mount;
 
+import java.nio.file.Path;
+
 public class MountPointInUseException extends IllegalMountPointException {
 
-	public MountPointInUseException(String msg) {
-		super(msg);
+	public MountPointInUseException(Path path) {
+		super(path);
 	}
 }

src/main/java/org/cryptomator/common/mount/MountPointNotExistsException.java

@@ -1,8 +1,10 @@
 package org.cryptomator.common.mount;
 
+import java.nio.file.Path;
+
 public class MountPointNotExistsException extends IllegalMountPointException {
 
-	public MountPointNotExistsException(String msg) {
-		super(msg);
+	public MountPointNotExistsException(Path path, String msg) {
+		super(path, msg);
 	}
 }

src/main/java/org/cryptomator/common/mount/MountPointNotSupportedException.java

@@ -1,8 +1,10 @@
 package org.cryptomator.common.mount;
 
+import java.nio.file.Path;
+
 public class MountPointNotSupportedException extends IllegalMountPointException {
 
-	public MountPointNotSupportedException(String msg) {
-		super(msg);
+	public MountPointNotSupportedException(Path path, String msg) {
+		super(path, msg);
 	}
 }

src/main/java/org/cryptomator/common/mount/MountPointPreparationException.java

@@ -1,12 +1,18 @@
 package org.cryptomator.common.mount;
 
+/**
+ * Used for wrapping exceptions which occur while preparing the mountpoint.<br>
+ * Instances of this exception are usually treated as generic error.
+ *
+ * @see IllegalMountPointException IllegalMountPointException for indicating configuration errors.
+ */
 public class MountPointPreparationException extends RuntimeException {
 
-	public MountPointPreparationException(String msg) {
-		super(msg);
-	}
-
 	public MountPointPreparationException(Throwable cause) {
 		super(cause);
 	}
-}
+
+	public MountPointPreparationException(String msg, Throwable cause) {
+		super(msg, cause);
+	}
+}

src/main/java/org/cryptomator/common/mount/MountWithinParentUtil.java

@@ -5,12 +5,9 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
-import java.nio.file.DirectoryNotEmptyException;
 import java.nio.file.FileAlreadyExistsException;
 import java.nio.file.Files;
 import java.nio.file.LinkOption;
-import java.nio.file.NoSuchFileException;
-import java.nio.file.NotDirectoryException;
 import java.nio.file.Path;
 
 public final class MountWithinParentUtil {
@@ -22,16 +19,16 @@ public final class MountWithinParentUtil {
 
 	private MountWithinParentUtil() {}
 
-	static void prepareParentNoMountPoint(Path mountPoint) throws MountPointPreparationException {
+	static void prepareParentNoMountPoint(Path mountPoint) throws IllegalMountPointException {
 		Path hideaway = getHideaway(mountPoint);
 		var mpExists = Files.exists(mountPoint, LinkOption.NOFOLLOW_LINKS);
 		var hideExists = Files.exists(hideaway, LinkOption.NOFOLLOW_LINKS);
 
 		//TODO: possible improvement by just deleting an _empty_ hideaway
 		if (mpExists && hideExists) { //both resources exist (whatever type)
-			throw new MountPointPreparationException(new FileAlreadyExistsException(hideaway.toString()));
+			throw new IllegalMountPointException(mountPoint);
 		} else if (!mpExists && !hideExists) { //neither mountpoint nor hideaway exist
-			throw new MountPointPreparationException(new NoSuchFileException(mountPoint.toString()));
+			throw new IllegalMountPointException(mountPoint);
 		} else if (!mpExists) { //only hideaway exists
 			checkIsDirectory(hideaway);
 			LOG.info("Mountpoint {} seems to be not properly cleaned up. Will be fixed on unmount.", mountPoint);
@@ -54,7 +51,7 @@ public final class MountWithinParentUtil {
 				int attempts = 0;
 				while (!Files.notExists(mountPoint)) {
 					if (attempts >= 10) {
-						throw new MountPointPreparationException("Path " + mountPoint + " could not be cleared");
+						throw new IllegalMountPointException(mountPoint, "Path could not be cleared: " + mountPoint);
 					}
 					Thread.sleep(1000);
 					attempts++;
@@ -99,16 +96,16 @@ public final class MountWithinParentUtil {
 		}
 	}
 
-	private static void checkIsDirectory(Path toCheck) throws MountPointPreparationException {
+	private static void checkIsDirectory(Path toCheck) throws IllegalMountPointException {
 		if (!Files.isDirectory(toCheck, LinkOption.NOFOLLOW_LINKS)) {
-			throw new MountPointPreparationException(new NotDirectoryException(toCheck.toString()));
+			throw new IllegalMountPointException(toCheck);
 		}
 	}
 
-	private static void checkIsEmpty(Path toCheck) throws MountPointPreparationException, IOException {
+	private static void checkIsEmpty(Path toCheck) throws IllegalMountPointException, IOException {
 		try (var dirStream = Files.list(toCheck)) {
 			if (dirStream.findFirst().isPresent()) {
-				throw new MountPointPreparationException(new DirectoryNotEmptyException(toCheck.toString()));
+				throw new IllegalMountPointException(toCheck);
 			}
 		}
 	}

src/main/java/org/cryptomator/common/mount/Mounter.java

@@ -99,7 +99,7 @@ public class Mounter {
 				var mpIsDriveLetter = userChosenMountPoint.toString().matches("[A-Z]:\\\\");
 				if (mpIsDriveLetter) {
 					if (driveLetters.getOccupied().contains(userChosenMountPoint)) {
-						throw new MountPointInUseException(userChosenMountPoint.toString());
+						throw new MountPointInUseException(userChosenMountPoint);
 					}
 				} else if (canMountToParent && !canMountToDir) {
 					MountWithinParentUtil.prepareParentNoMountPoint(userChosenMountPoint);
@@ -115,13 +115,13 @@ public class Mounter {
 							|| (!canMountToParent && !mpIsDriveLetter) //
 							|| (!canMountToDir && !canMountToParent && !canMountToSystem && !canMountToDriveLetter);
 					if (configNotSupported) {
-						throw new MountPointNotSupportedException(e.getMessage());
+						throw new MountPointNotSupportedException(userChosenMountPoint, e.getMessage());
 					} else if (canMountToDir && !canMountToParent && !Files.exists(userChosenMountPoint)) {
 						//mountpoint must exist
-						throw new MountPointNotExistsException(e.getMessage());
+						throw new MountPointNotExistsException(userChosenMountPoint, e.getMessage());
 					} else {
 						//TODO: add specific exception for !canMountToDir && canMountToParent && !Files.notExists(userChosenMountPoint)
-						throw new IllegalMountPointException(e.getMessage());
+						throw new IllegalMountPointException(userChosenMountPoint, e.getMessage());
 					}
 				}
 			}