public class SplittableInputStream extends InputStream
getInputStream(int)
)
(that also yield the same bytes).Constructor and Description |
---|
SplittableInputStream(InputStream inputStream,
int length)
Wraps an input stream so that copy streams can be split off.
|
Modifier and Type | Method and Description |
---|---|
int |
available()
Returns an estimate of the number of bytes that can be read (or
skipped over) from this input stream without blocking by the next
invocation of a method for this input stream.
|
void |
close()
Closes this input stream and releases any system resources associated
with the stream.
|
int |
getBytesBuffered()
Returns the number of buffered bytes in the underlying buffer.
|
InputStream |
getInputStream(int position)
Gets a copy of the inputstream positioned at
position . |
int |
getLength()
Returns the length of the underlying buffer.
|
int |
getPosition()
Returns the position within the input stream (the number of bytes read since this input stream was constructed).
|
void |
mark(int readlimit)
Marks the current position in this input stream.
|
boolean |
markSupported()
Tests if this input stream supports the
mark and
reset methods. |
int |
read()
Reads the next byte of data from the input stream.
|
void |
reset()
Repositions this stream to the position at the time the
mark method was last called on this input stream. |
long |
skip(long n)
Skips over and discards
n bytes of data from this input
stream. |
void |
updateFrom(SplittableInputStream other)
Updates this stream's buffer based on some other stream's buffer.
|
read, read
public SplittableInputStream(InputStream inputStream, int length)
inputStream
- the original input streamlength
- the precise length of bytes that the original input stream providespublic void updateFrom(SplittableInputStream other)
other
- the other streampublic InputStream getInputStream(int position)
position
.position
- a position between 0
and getPosition()
public int getPosition()
public int read() throws IOException
int
in the range 0
to
255
. If no byte is available because the end of the stream
has been reached, the value -1
is returned. This method
blocks until input data is available, the end of the stream is detected,
or an exception is thrown.read
in class InputStream
-1
if the end of the
stream is reachedIOException
- if an I/O error occurspublic long skip(long n) throws IOException
n
bytes of data from this input
stream. The skip
method may, for a variety of reasons, end
up skipping over some smaller number of bytes, possibly 0
.
This may result from any of a number of conditions; reaching end of file
before n
bytes have been skipped is only one possibility.
The actual number of bytes skipped is returned. If n
is
negative, no bytes are skipped.skip
in class InputStream
n
- the number of bytes to be skippedIOException
- if the stream does not support seek, or if some other I/O error occurspublic int available() throws IOException
available
in class InputStream
0
when
it reaches the end of the input streamIOException
- on errorpublic void close() throws IOException
close
in interface Closeable
close
in interface AutoCloseable
close
in class InputStream
IOException
- on errorpublic void mark(int readlimit)
reset
method repositions this stream at the last marked
position so that subsequent reads re-read the same bytes.
The readlimit
arguments tells this input stream to
allow that many bytes to be read before the mark position gets
invalidated.
The general contract of mark
is that, if the method
markSupported
returns true
, the stream somehow
remembers all the bytes read after the call to mark
and
stands ready to supply those same bytes again if and whenever the method
reset
is called. However, the stream is not required to
remember any data at all if more than readlimit
bytes are
read from the stream before reset
is called.
mark
in class InputStream
readlimit
- the maximum limit of bytes that can be read before the mark position becomes invalidInputStream.reset()
public void reset() throws IOException
mark
method was last called on this input stream.
The general contract of reset
is:
markSupported
returns
true
, then:
mark
has not been called since
the stream was created, or the number of bytes read from the stream
since mark
was last called is larger than the argument
to mark
at that last call, then an
IOException
might be thrown.
IOException
is not thrown, then the
stream is reset to a state such that all the bytes read since the
most recent call to mark
(or since the start of the
file, if mark
has not been called) will be resupplied
to subsequent callers of the read
method, followed by
any bytes that otherwise would have been the next input data as of
the time of the call to reset
. markSupported
returns
false
, then:
reset
may throw an
IOException
.
IOException
is not thrown, then the stream
is reset to a fixed state that depends on the particular type of the
input stream and how it was created. The bytes that will be supplied
to subsequent callers of the read
method depend on the
particular type of the input stream. reset
in class InputStream
IOException
- if this stream has not been marked or if the mark has been invalidatedIOException
- on errorInputStream.mark(int)
,
IOException
public boolean markSupported()
mark
and
reset
methods. Whether or not mark
and
reset
are supported is an invariant property of a
particular input stream instance. The markSupported
method
of InputStream
returns false
.markSupported
in class InputStream
true
if this stream instance supports the mark
and reset methods and false
otherwiseInputStream.mark(int)
,
InputStream.reset()
public int getLength()
public int getBytesBuffered()
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