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more SAF implementation

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* full support for Directory API (Android Lollipop or later)
* best effort to handle any kind errors (missing file, revoked permissions, etc) and recover the download
* implemented directory choosing
* fix download database version upgrading
* misc. cleanup
* do not release permission on the old save path (if the user change the download directory) under SAF api
This commit is contained in:
kapodamy 2019-04-09 18:38:34 -03:00
parent f6b32823ba
commit d00dc798f4
28 changed files with 946 additions and 589 deletions
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41
app/src/main/java/us/shandian/giga/get/DownloadMission.java
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@ -2,7 +2,6 @@ package us.shandian.giga.get;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
import android.util.Log;
import java.io.File;
@ -86,7 +85,7 @@ public class DownloadMission extends Mission {
/**
* the post-processing algorithm instance
*/
public transient Postprocessing psAlgorithm;
public Postprocessing psAlgorithm;
/**
* The current resource to download, see {@code urls[current]} and {@code offsets[current]}
@ -483,7 +482,7 @@ public class DownloadMission extends Mission {
if (init != null && Thread.currentThread() != init && init.isAlive()) {
init.interrupt();
synchronized (blockState) {
resetState();
resetState(false, true, ERROR_NOTHING);
}
return;
}
@ -525,10 +524,18 @@ public class DownloadMission extends Mission {
return res;
}
void resetState() {
/**
* Resets the mission state
*
* @param rollback {@code true} true to forget all progress, otherwise, {@code false}
* @param persistChanges {@code true} to commit changes to the metadata file, otherwise, {@code false}
*/
public void resetState(boolean rollback, boolean persistChanges, int errorCode) {
done = 0;
blocks = -1;
errCode = ERROR_NOTHING;
errCode = errorCode;
errObject = null;
fallback = false;
unknownLength = false;
finishCount = 0;
@ -537,7 +544,10 @@ public class DownloadMission extends Mission {
blockState.clear();
threads = new Thread[0];
Utility.writeToFile(metadata, DownloadMission.this);
if (rollback) current = 0;
if (persistChanges)
Utility.writeToFile(metadata, DownloadMission.this);
}
private void initializer() {
@ -633,33 +643,22 @@ public class DownloadMission extends Mission {
threads[0].interrupt();
}
/**
* changes the StoredFileHelper for another and saves the changes to the metadata file
*
* @param newStorage the new StoredFileHelper instance to use
*/
public void changeStorage(@NonNull StoredFileHelper newStorage) {
storage = newStorage;
// commit changes on the metadata file
runAsync(-2, this::writeThisToFile);
}
/**
* Indicates whatever the backed storage is invalid
*
* @return {@code true}, if storage is invalid and cannot be used
*/
public boolean hasInvalidStorage() {
return errCode == ERROR_PROGRESS_LOST || storage == null || storage.isInvalid();
return errCode == ERROR_PROGRESS_LOST || storage == null || storage.isInvalid() || !storage.existsAsFile();
}
/**
* Indicates whatever is possible to start the mission
*
* @return {@code true} is this mission is "sane", otherwise, {@code false}
* @return {@code true} is this mission its "healthy", otherwise, {@code false}
*/
public boolean canDownload() {
return !(isPsFailed() || errCode == ERROR_POSTPROCESSING_HOLD) && !isFinished() && !hasInvalidStorage();
public boolean isCorrupt() {
return (isPsFailed() || errCode == ERROR_POSTPROCESSING_HOLD) || isFinished() || hasInvalidStorage();
}
private boolean doPostprocessing() {