private static TreeSet<Integer> getAllAvailableProtocolVersionsForAppInfo(
Context context, NativeAppInfo appInfo) {
TreeSet<Integer> allAvailableVersions = new TreeSet<Integer>();
ContentResolver contentResolver = context.getContentResolver();
String[] projection = new String[] {PLATFORM_PROVIDER_VERSION_COLUMN};
Uri uri = buildPlatformProviderVersionURI(appInfo);
Cursor c = null;
try {
c = contentResolver.query(uri, projection, null, null, null);
if (c != null) {
while (c.moveToNext()) {
int version = c.getInt(c.getColumnIndex(PLATFORM_PROVIDER_VERSION_COLUMN));
allAvailableVersions.add(version);
}
}
} finally {
if (c != null) {
c.close();
}
}
return allAvailableVersions;
}
/**
* This is public to allow for testing. Developers are discouraged from using this method, since
* it may change without notice.
*/
public static int computeLatestAvailableVersionFromVersionSpec(
TreeSet<Integer> allAvailableFacebookAppVersions, int latestSdkVersion, int[] versionSpec) {
// Remember that these ranges are sorted in ascending order and can be unbounded. So we are
// starting
// from the end of the version-spec array and working backwards, to try get the newest possible
// version
int versionSpecIndex = versionSpec.length - 1;
Iterator<Integer> fbAppVersionsIterator = allAvailableFacebookAppVersions.descendingIterator();
int latestFacebookAppVersion = -1;
while (fbAppVersionsIterator.hasNext()) {
int fbAppVersion = fbAppVersionsIterator.next();
// We're holding on to the greatest fb-app version available.
latestFacebookAppVersion = Math.max(latestFacebookAppVersion, fbAppVersion);
// If there is a newer version in the versionSpec, throw it away, we don't have it
while (versionSpecIndex >= 0 && versionSpec[versionSpecIndex] > fbAppVersion) {
versionSpecIndex--;
}
if (versionSpecIndex < 0) {
// There was no fb app version that fell into any range in the versionSpec - or - the
// versionSpec was empty, which means that this action is not supported.
return NO_PROTOCOL_AVAILABLE;
}
// If we are here, we know we are within a range specified in the versionSpec. We should see
// if it is
// a disabled or enabled range.
if (versionSpec[versionSpecIndex] == fbAppVersion) {
// if the versionSpecIndex is even, it is enabled; if odd, disabled
return (versionSpecIndex % 2 == 0
? Math.min(latestFacebookAppVersion, latestSdkVersion)
: NO_PROTOCOL_AVAILABLE);
}
}
return NO_PROTOCOL_AVAILABLE;
}