public final class TeeDataSource extends Object implements DataSource
DataSink
as the data is read.Constructor and Description |
---|
TeeDataSource(DataSource upstream,
DataSink dataSink) |
Modifier and Type | Method and Description |
---|---|
void |
close()
Closes the
DataSource . |
long |
open(DataSpec dataSpec)
Opens the
DataSource to read the specified data. |
int |
read(byte[] buffer,
int offset,
int max)
Reads up to
length bytes of data and stores them into buffer , starting at
index offset . |
public TeeDataSource(DataSource upstream, DataSink dataSink)
upstream
- The upstream DataSource
.dataSink
- The DataSink
into which data is written.public long open(DataSpec dataSpec) throws IOException
DataSource
DataSource
to read the specified data. Calls to DataSource.open(DataSpec)
and
DataSource.close()
must be balanced.
Note: If DataSource.open(DataSpec)
throws an IOException
, callers must still call
DataSource.close()
to ensure that any partial effects of the DataSource.open(DataSpec)
invocation
are cleaned up. Implementations of this class can assume that callers will call
DataSource.close()
in this case.
open
in interface DataSource
dataSpec
- Defines the data to be read.DataSpec.length
equals C.LENGTH_UNBOUNDED
) this value
is the resolved length of the request, or C.LENGTH_UNBOUNDED
if the length is still
unresolved. For all other requests, the value returned will be equal to the request's
DataSpec.length
.IOException
- If an error occurs opening the source.public int read(byte[] buffer, int offset, int max) throws IOException
DataSource
length
bytes of data and stores them into buffer
, starting at
index offset
.
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.
read
in interface DataSource
buffer
- The buffer into which the read data should be stored.offset
- The start offset into buffer
at which data should be written.max
- The maximum number of bytes to read.C.RESULT_END_OF_INPUT
if the end of the opened
range is reached.IOException
- If an error occurs reading from the source.public void close() throws IOException
DataSource
DataSource
.
Note: This method will be called even if the corresponding call to DataSource.open(DataSpec)
threw an IOException
. See DataSource.open(DataSpec)
for more details.
close
in interface DataSource
IOException
- If an error occurs closing the source.