public interface DataSource
|Modifier and Type||Method and Description|
Reads up to
long open(DataSpec dataSpec) throws IOException
DataSourceto read the specified data. Calls to
close()must be balanced.
open(DataSpec) throws an
IOException, callers must still call
close() to ensure that any partial effects of the
are cleaned up. Implementations of this class can assume that callers will call
close() in this case.
dataSpec- Defines the data to be read.
C.LENGTH_UNBOUNDED) this value is the resolved length of the request, or
C.LENGTH_UNBOUNDEDif the length is still unresolved. For all other requests, the value returned will be equal to the request's
IOException- If an error occurs opening the source.
void close() throws IOException
IOException- If an error occurs closing the source.
int read(byte buffer, int offset, int readLength) throws IOException
lengthbytes of data and stores them into
buffer, starting at index
This method blocks until at least one byte of data can be read, the end of the opened range is detected, or an exception is thrown.
buffer- The buffer into which the read data should be stored.
offset- The start offset into
bufferat which data should be written.
readLength- The maximum number of bytes to read.
C.RESULT_END_OF_INPUTif the end of the opened range is reached.
IOException- If an error occurs reading from the source.