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## Package com.google.appengine.api.files

Interface Summary
FileReadChannel | An `ReadableByteChannel` for reading bytes from an `AppEngineFile`.
FileService | This is the interface for interacting with the Google App Engine File Service.
FileWriteChannel | An `WritableByteChannel` for appending bytes to an `AppEngineFile`.
RecordReadChannel | A channel for reading records from a `FileReadChannel`.
RecordWriteChannel | A @{link WritableByteChannel} for writing records to an `FileWriteChannel`.

Class Summary
AppEngineFile | An `AppEngineFile` represents a file in one of the Google App Engine file systems.
Crc32c | This class generates a CRC32C checksum, defined by rfc3720 section B.4.
FileServiceFactory | A factory for producing instances of `FileService`.
RecordWriteChannelImpl | An implementation of a `RecordWriteChannel`.

Enum Summary
AppEngineFile.FileSystem | Represents the back-end storage location of a file.

Exception Summary
FinalizationException | An `Exception` that indicates that a file is in the wrong finalization state.
KeyOrderingException | A `KeyOrderingException` is thrown by the method `FileWriteChannel.write(ByteBuffer, String)` if the `sequenceKey` parameter is not `null` and the backend system already has recorded a last good sequence key for the file and `sequenceKey` is not lexicographically strictly greater than the last good sequence key.
LockException | An exception that indicates one of two possible cases: An exclusive lock on a file is held by a different App Engine request and so the file may not be accessed in this request This request is trying to acquire an exclusive lock on a file but the file is already opened in a different App Engine request

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