/// <summary>
/// Returns a PolyFormat of the given type, if it exists.
/// If the asset has more than one format of the given type, returns the first one seen.
/// If the asset does not have a format of the given type, returns null.
/// </summary>
public PolyFormat GetFormatIfExists(PolyFormatType type)
{
foreach (PolyFormat format in formats)
{
if (format == null)
{
continue;
}
if (format.formatType == type)
{
return(format);
}
}
return(null);
}
public void FetchFormatFiles(PolyAsset asset, PolyFormatType formatType,
PolyApi.FetchFormatFilesCallback completionCallback, FetchProgressCallback progressCallback = null)
{
PolyUtils.AssertNotNull(asset, "Asset can't be null.");
PolyUtils.AssertNotNull(formatType, "formatType can't be null.");
PolyFormat packageToFetch = asset.GetFormatIfExists(formatType);
if (packageToFetch == null)
{
if (completionCallback != null)
{
completionCallback(asset, PolyStatus.Error("Format type not present in asset"));
}
return;
}
PolyUtils.AssertNotNull(packageToFetch.root, "packageToFetch.root can't be null.");
PolyUtils.AssertNotNull(packageToFetch.root.url, "packageToFetch.root.url can't be null.");
PolyUtils.AssertNotNull(packageToFetch.resources, "packageToFetch.resources can't be null.");
string accessToken = GetAccessToken();
FetchOperationState state = new FetchOperationState();
state.asset = asset;
state.completionCallback = completionCallback;
state.progressCallback = progressCallback;
state.packageBeingFetched = packageToFetch;
// Indicates how many files are pending download (1 for main file + 1 for each resource).
state.totalFiles = state.pendingFiles = 1 + packageToFetch.resources.Count;
// Note that the callbacks are asynchronous so they may complete in any order. What we do know is that they
// will all be called on the main thread, so they won't be called concurrently.
long maxCacheAge = asset.IsMutable ? MUTABLE_ASSET_MAX_CACHE_AGE : IMMUTABLE_ASSET_MAX_CACHE_AGE;
PolyClientUtils.GetRawFileBytes(packageToFetch.root.url, accessToken, maxCacheAge,
(PolyStatus status, byte[] data) => { ProcessFileFetchResult(state, ROOT_FILE_INDEX, status, data); });
for (int i = 0; i < packageToFetch.resources.Count; i++)
{
int thisIndex = i; // copy of variable, for closure below.
PolyClientUtils.GetRawFileBytes(packageToFetch.resources[i].url, accessToken, maxCacheAge,
(status, data) => { ProcessFileFetchResult(state, thisIndex, status, data); });
}
}
/// <summary>
/// Retrieves information about the given asset in the given format, then calls the given callback.
/// </summary>
/// <param name="asset">The asset for which to fetch the files.</param>
/// <param name="format">The desired format.</param>
/// <param name="callback">The callback to call when the fetch is complete.</param>
public static void FetchFormatFiles(PolyAsset asset, PolyFormatType format, FetchFormatFilesCallback callback)
{
CheckInitialized();
PolyMainInternal.Instance.FetchFormatFiles(asset, format, callback);
}