public class FastMultiByteArrayInputStream extends MeasurableInputStream implements RepositionableStream
FastByteArrayInputStream, but it can hold 256 PiB of data. The relevant constructor is
FastMultiByteArrayInputStream(InputStream, long), which fetches a stream and loads it into a sequence of byte arrays.
|Modifier and Type||Field and Description|
The array of arrays backing the input stream, plus an additional
The current array.
The number of valid bytes in
The number of bits of an array slice index.
The mask to retrieve a slice offset.
The maximum length of an array slice.
|Constructor and Description|
Creates a new multi-array input stream using a given array.
Creates a new multi-array input stream sharing the backing arrays of another multi-array input stream.
Creates a new multi-array input stream loading it from an input stream.
Creates a new multi-array input stream loading it from a measurable input stream.
|Modifier and Type||Method and Description|
Returns the number of bytes that can be read (or skipped over) from this input stream without blocking.
Returns the overall length of this stream (optional operation).
Marks the current position in this input stream.
Tests if this input stream supports the
Returns the current stream position.
Sets the current stream position.
Reads the next byte of data from the input stream.
Reads up to
Repositions this stream to the position at the time the
Skips over and discards
public static final int SLICE_BITS
public static final int SLICE_SIZE
public static final int SLICE_MASK
public byte array
public byte current
public long length
public FastMultiByteArrayInputStream(MeasurableInputStream is) throws IOException
is- the input stream that will fill the array.
public FastMultiByteArrayInputStream(InputStream is, long size) throws IOException
is- the input stream that will fill the array.
size- the number of bytes to be read from
public FastMultiByteArrayInputStream(FastMultiByteArrayInputStream is)
is- the multi-array input stream to replicate.
public FastMultiByteArrayInputStream(byte array)
array- the backing array.
public int available()
Note that this number may be smaller than the number of bytes actually
available from the stream if this number exceeds
public long skip(long n)
nbytes of data from this input stream. The
skipmethod 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
nbytes have been skipped is only one possibility. The actual number of bytes skipped is returned. If
nis negative, the
skipmethod for class
InputStreamalways returns 0, and no bytes are skipped. Subclasses may handle the negative value differently.
skip method of this class creates a
byte array and then repeatedly reads into it until
have been read or the end of the stream has been reached. Subclasses are
encouraged to provide a more efficient implementation of this method.
For instance, the implementation may depend on the ability to seek.
public int read()
intin the range
255. If no byte is available because the end of the stream has been reached, the value
-1is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.
A subclass must provide an implementation of this method.
public int read(byte b, int offset, int length)
lenbytes of data from the input stream into an array of bytes. An attempt is made to read as many as
lenbytes, but a smaller number may be read. The number of bytes actually read is returned as an integer.
This method blocks until input data is available, end of file is detected, or an exception is thrown.
len is zero, then no bytes are read and
0 is returned; otherwise, there is an attempt to read at
least one byte. If no byte is available because the stream is at end of
file, the value
-1 is returned; otherwise, at least one
byte is read and stored into
The first byte read is stored into element
next one into
b[off+1], and so on. The number of bytes read
is, at most, equal to
len. Let k be the number of
bytes actually read; these bytes will be stored in elements
In every case, elements
b[off] and elements
b[b.length-1] are unaffected.
InputStream simply calls the method
read() repeatedly. If the first such call results in an
IOException, that exception is returned from the call to
len) method. If
any subsequent call to
read() results in a
IOException, the exception is caught and treated as if it
were end of file; the bytes read up to that point are stored into
b and the number of bytes read before the exception
occurred is returned. The default implementation of this method blocks
until the requested amount of input data
len has been read,
end of file is detected, or an exception is thrown. Subclasses are encouraged
to provide a more efficient implementation of this method.
b- the buffer into which the data is read.
offset- the start offset in array
bat which the data is written.
length- the maximum number of bytes to read.
-1if there is no more data because the end of the stream has been reached.
public long position()
public void position(long newPosition)
public long length() throws IOException
public void close()
public boolean markSupported()
resetmethods. Whether or not
resetare supported is an invariant property of a particular input stream instance. The
public void mark(int dummy)
resetmethod repositions this stream at the last marked position so that subsequent reads re-read the same bytes.
readlimit arguments tells this input stream to
allow that many bytes to be read before the mark position gets
The general contract of
mark is that, if the method
true, the stream somehow
remembers all the bytes read after the call to
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.
Marking a closed stream should not have any effect on the stream.
mark method of
public void reset()
markmethod was last called on this input stream.
The general contract of
markhas not been called since the stream was created, or the number of bytes read from the stream since
markwas last called is larger than the argument to
markat that last call, then an
IOExceptionmight be thrown.
IOExceptionis 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
markhas not been called) will be resupplied to subsequent callers of the
readmethod, followed by any bytes that otherwise would have been the next input data as of the time of the call to
resetmay throw an
IOExceptionis 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
readmethod depend on the particular type of the input stream.
reset for class
does nothing except throw an