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/* Copyright 2016 Software Freedom Conservancy Inc.
*
* This software is licensed under the GNU LGPL (version 2.1 or later).
* See the COPYING file in this distribution.
*/
// Class for aggregating one-off "upgrade" tasks that occur at startup, such as
// moving or deleting files. This occurs after the UI is shown, so it's not appropriate
// for database updates and such.
public class Upgrades {
private static Upgrades? instance = null;
private uint64 total_steps = 0;
private Gee.LinkedList<UpgradeTask> task_list = new Gee.LinkedList<UpgradeTask>();
private Upgrades() {
// Add all upgrade tasks here.
add(new MimicsRemovalTask());
if (Application.get_instance().get_raw_thumbs_fix_required())
add(new FixupRawThumbnailsTask());
}
// Call this to initialize the subsystem.
public static void init() {
assert(instance == null);
instance = new Upgrades();
}
public static Upgrades get_instance() {
return instance;
}
// Gets the total number of steps for the progress monitor.
public uint64 get_step_count() {
return total_steps;
}
// Performs all upgrade tasks.
public void execute(ProgressMonitor? monitor = null) {
foreach (UpgradeTask task in task_list)
task.execute(monitor);
}
private void add(UpgradeTask task) {
total_steps += task.get_step_count();
task_list.add(task);
}
}
// Interface for upgrades that happen on startup.
// When creating a new upgrade task, you MUST add it to the constructor
// supplied in Upgrades (see above.)
private interface UpgradeTask : Object{
// Returns the number of steps involved in the ugprade.
public abstract uint64 get_step_count();
// Performs the upgrade. Note that when using the progress
// monitor, the total number of steps must be equal to the
// step count above.
public abstract void execute(ProgressMonitor? monitor = null);
}
// Deletes the mimics folder, if it still exists.
// Note: for the step count to be consistent, files cannot be written
// to the mimcs folder for the durration of this task.
private class MimicsRemovalTask : Object, UpgradeTask {
// Mimics folder (to be deleted, if present)
private File mimic_dir = AppDirs.get_data_dir().get_child("mimics");
private uint64 num_mimics = 0;
public uint64 get_step_count() {
try {
num_mimics = count_files_in_directory(mimic_dir);
} catch (Error e) {
debug("Error on deleting mimics: %s", e.message);
}
return num_mimics;
}
public void execute(ProgressMonitor? monitor = null) {
try {
delete_all_files(mimic_dir, null, monitor, num_mimics, null);
mimic_dir.delete();
} catch (Error e) {
debug("Could not delete mimics: %s", e.message);
}
}
}
// Deletes 'stale' thumbnails from camera raw files whose default developer was
// CAMERA and who may have been incorrectly generated from the embedded preview by
// previous versions of the application that had bug 4692.
private class FixupRawThumbnailsTask : Object, UpgradeTask {
public uint64 get_step_count() {
int num_raw_files = 0;
foreach (PhotoRow phr in PhotoTable.get_instance().get_all()) {
if (phr.master.file_format == PhotoFileFormat.RAW)
num_raw_files++;
}
return num_raw_files;
}
public void execute(ProgressMonitor? monitor = null) {
debug("Executing thumbnail deletion and fixup");
foreach (PhotoRow phr in PhotoTable.get_instance().get_all()) {
if ((phr.master.file_format == PhotoFileFormat.RAW) &&
(phr.developer == RawDeveloper.CAMERA)) {
ThumbnailCache.remove(LibraryPhoto.global.fetch(phr.photo_id));
}
}
}
}
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