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Refactored CustomMountPointChooser

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See: https://github.com/cryptomator/cryptomator/pull/1307#discussion_r472832435
This commit is contained in:
JaniruTEC
2020-08-21 00:54:57 +02:00
parent 5dac594cc9
commit 8483f71f57
1 changed files with 38 additions and 34 deletions
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72
main/commons/src/main/java/org/cryptomator/common/mountpoint/CustomMountPointChooser.java
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@@ -1,6 +1,5 @@
package org.cryptomator.common.mountpoint;
import org.cryptomator.common.vaults.MountPointRequirement;
import org.cryptomator.common.vaults.Vault;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@@ -41,46 +40,51 @@ public class CustomMountPointChooser implements MountPointChooser {
@Override
public boolean prepare(Path mountPoint) throws InvalidMountPointException {
MountPointRequirement requirement = this.vault.getMountPointRequirement();
//Requirement "NONE" doesn't make any sense here.
//No need to prepare/verify a Mountpoint without requiring one...
assert requirement != MountPointRequirement.NONE;
//Not implemented anywhere (yet)
assert requirement != MountPointRequirement.PARENT_OPT_MOUNT_POINT;
if(requirement == MountPointRequirement.PARENT_NO_MOUNT_POINT) {
//This the case on Windows when using FUSE
//See https://github.com/billziss-gh/winfsp/issues/320
Path parent = mountPoint.getParent();
if (!Files.isDirectory(parent)) {
throw new InvalidMountPointException(new NotDirectoryException(parent.toString()));
switch (this.vault.getMountPointRequirement()) {
case PARENT_NO_MOUNT_POINT -> prepareParentNoMountPoint(mountPoint);
case EMPTY_MOUNT_POINT -> prepareEmptyMountPoint(mountPoint);
case NONE -> {
//Requirement "NONE" doesn't make any sense here.
//No need to prepare/verify a Mountpoint without requiring one...
assert false : "Illegal MountPointRequirement";
}
//We must use #notExists() here because notExists =/= !exists (see docs)
if (!Files.notExists(mountPoint, LinkOption.NOFOLLOW_LINKS)) {
//File exists OR can't be determined
throw new InvalidMountPointException(new FileAlreadyExistsException(mountPoint.toString()));
}
} else if(requirement == MountPointRequirement.EMPTY_MOUNT_POINT) {
//This is the case for Windows when using Dokany
//and for Linux and Mac
if (!Files.isDirectory(mountPoint)) {
throw new InvalidMountPointException(new NotDirectoryException(mountPoint.toString()));
}
try (DirectoryStream<Path> ds = Files.newDirectoryStream(mountPoint)) {
if (ds.iterator().hasNext()) {
throw new InvalidMountPointException(new DirectoryNotEmptyException(mountPoint.toString()));
}
} catch (IOException exception) {
throw new InvalidMountPointException("IOException while checking folder content", exception);
default -> {
//Currently the case for "PARENT_OPT_MOUNT_POINT"
assert false : "Not implemented";
}
}
LOG.debug("Successfully checked custom mount point: {}", mountPoint);
return false;
}
private void prepareParentNoMountPoint(Path mountPoint) throws InvalidMountPointException {
//This the case on Windows when using FUSE
//See https://github.com/billziss-gh/winfsp/issues/320
Path parent = mountPoint.getParent();
if (!Files.isDirectory(parent)) {
throw new InvalidMountPointException(new NotDirectoryException(parent.toString()));
}
//We must use #notExists() here because notExists =/= !exists (see docs)
if (!Files.notExists(mountPoint, LinkOption.NOFOLLOW_LINKS)) {
//File exists OR can't be determined
throw new InvalidMountPointException(new FileAlreadyExistsException(mountPoint.toString()));
}
}
private void prepareEmptyMountPoint(Path mountPoint) throws InvalidMountPointException {
//This is the case for Windows when using Dokany and for Linux and Mac
if (!Files.isDirectory(mountPoint)) {
throw new InvalidMountPointException(new NotDirectoryException(mountPoint.toString()));
}
try (DirectoryStream<Path> ds = Files.newDirectoryStream(mountPoint)) {
if (ds.iterator().hasNext()) {
throw new InvalidMountPointException(new DirectoryNotEmptyException(mountPoint.toString()));
}
} catch (IOException exception) {
throw new InvalidMountPointException("IOException while checking folder content", exception);
}
}
@Override
public int getPosition() {
return POSITION;