com.bumptech.glide.load.data

Class LocalUriFetcher<T>

java.lang.Object

com.bumptech.glide.load.data.LocalUriFetcher<T>

Type Parameters:

T - The type of data that will obtained for the given uri (For example, InputStream or ParcelFileDescriptor.

All Implemented Interfaces:

DataFetcher<T>

Direct Known Subclasses:

FileDescriptorLocalUriFetcher, StreamLocalUriFetcher

public abstract class LocalUriFetcher<T>
extends Object
implements DataFetcher<T>

A DataFetcher that uses an ContentResolver to load data from a Uri pointing to a local resource.

Nested Class Summary

Nested classes/interfaces inherited from interface com.bumptech.glide.load.data.DataFetcher

DataFetcher.DataCallback<T>

Constructor Summary

Constructors

Constructor and Description
LocalUriFetcher(ContentResolver contentResolver, Uri uri) Opens an input stream for a uri pointing to a local asset.

Method Summary

Modifier and Type	Method and Description
void	cancel() A method that will be called when a load is no longer relevant and has been cancelled.
void	cleanup() Cleanup or recycle any resources used by this data fetcher.
protected abstract void	close(T data) Closes the concrete data type if necessary.
DataSource	getDataSource() Returns the DataSource this fetcher will return data from.
void	loadData(Priority priority, DataFetcher.DataCallback<? super T> callback) Fetch data from which a resource can be decoded.
protected abstract T	loadResource(Uri uri, ContentResolver contentResolver) Returns a concrete data type from the given Uri using the given ContentResolver.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.bumptech.glide.load.data.DataFetcher

getDataClass

Constructor Detail

LocalUriFetcher

public LocalUriFetcher(ContentResolver contentResolver,
                       Uri uri)

Opens an input stream for a uri pointing to a local asset. Only certain uris are supported

Parameters:

contentResolver - Any ContentResolver.

uri - A Uri pointing to a local asset. This load will fail if the uri isn't openable by ContentResolver.openInputStream(android.net.Uri)

See Also:

ContentResolver.openInputStream(android.net.Uri)

Method Detail

loadData

public final void loadData(Priority priority,
                           DataFetcher.DataCallback<? super T> callback)

Description copied from interface: DataFetcher

Fetch data from which a resource can be decoded.

This will always be called on background thread so it is safe to perform long running tasks here. Any third party libraries called must be thread safe (or move the work to another thread) since this method will be called from a thread in a ExecutorService that may have more than one background thread.

You MUST use the DataFetcher.DataCallback once the request is complete. You are free to move the fetch work to another thread and call the callback from there.

This method will only be called when the corresponding resource is not in the cache.

Note - this method will be run on a background thread so blocking I/O is safe.

Specified by:

loadData in interface DataFetcher<T>

Parameters:

priority - The priority with which the request should be completed.

callback - The callback to use when the request is complete

See Also:

where the data retuned will be cleaned up

cleanup

public void cleanup()

Description copied from interface: DataFetcher

Cleanup or recycle any resources used by this data fetcher. This method will be called in a finally block after the data provided by DataFetcher.loadData(com.bumptech.glide.Priority, com.bumptech.glide.load.data.DataFetcher.DataCallback) has been decoded by the ResourceDecoder.

Note - this method will be run on a background thread so blocking I/O is safe.

Specified by:

cleanup in interface DataFetcher<T>

cancel

public void cancel()

Description copied from interface: DataFetcher

A method that will be called when a load is no longer relevant and has been cancelled. This method does not need to guarantee that any in process loads do not finish. It also may be called before a load starts or after it finishes.

The best way to use this method is to cancel any loads that have not yet started, but allow those that are in process to finish since its we typically will want to display the same resource in a different view in the near future.

Note - this method will be run on the main thread so it should not perform blocking operations and should finish quickly.

Specified by:

cancel in interface DataFetcher<T>

getDataSource

public DataSource getDataSource()

Description copied from interface: DataFetcher

Returns the DataSource this fetcher will return data from.

Specified by:

getDataSource in interface DataFetcher<T>

loadResource

protected abstract T loadResource(Uri uri,
                                  ContentResolver contentResolver)
                           throws FileNotFoundException

Returns a concrete data type from the given Uri using the given ContentResolver.

Throws:

FileNotFoundException

close

protected abstract void close(T data)
                       throws IOException

Closes the concrete data type if necessary.

Note - We can't rely on the closeable interface because it was added after our min API level. See issue #157.

Parameters:

data - The data to close.

Throws:

IOException