public FileCache(Context context, Util util) {
// Find the dir to save cached images
if (android.os.Environment.getExternalStorageState()
.equals(android.os.Environment.MEDIA_MOUNTED))
cacheDir = new File(android.os.Environment.getExternalStorageDirectory(), "Obliquity");
else cacheDir = context.getCacheDir();
if (!cacheDir.exists()) cacheDir.mkdirs();
mUtil = util;
running = false;
tempDirSize = 0;
mContext = context;
if ((mDirSize = mUtil.getLong(KEY, -99)) == -99)
initDirSize(); // If Util has no dirSize calculated
if (DEBUG) Log.d(TAG, "MAX CACHE SIZE : " + maxDirectorySize + " MB");
setupDirectoryOverflow();
if (DEBUG) Log.d(TAG, "FileCache mDirSize : " + mDirSize / 1024. / 1024. + "MB");
}
// Deletes 5MB worth of data from old files
// Consider doing it in a thread. Probably cpu intensive task
private void cleanCache(boolean recursiveCall) {
if (DEBUG) Log.e(TAG, "Cache Full!. Clearning up 2MB of files");
if (recursiveCall) setupDirectoryOverflow(); // Rebuilt tree if this is a recursive call
int delBytes = 0;
File f;
String filename;
int i = 0;
while (delBytes <= cleanupDirCache) {
filename = pQueue.poll();
if (DEBUG) Log.d(TAG, "Deleting file : " + filename);
if (filename == null) break;
f = new File(cacheDir, filename);
if (f != null) {
delBytes += f.length();
f.delete();
i++;
}
}
mDirSize -= delBytes;
if (!recursiveCall
&& delBytes
< cleanupDirCache) // If deletedBytes was less than 5MB, probably because the
// priorityQueue is not built properly
cleanCache(true); // Try again with rebuilding of whole priority queue
if (DEBUG) Log.d(TAG, delBytes / 1024. + " kb of files deleted | No. of files deleted : " + i);
}