Closeable
, AutoCloseable
public class SequenceInputStream extends InputStream
SequenceInputStream
represents the logical concatenation of other input streams. It starts out with an ordered collection of input streams and reads from the first one until end of file is reached, whereupon it reads from the second one, and so on, until end of file is reached on the last of the contained input streams.Constructor | Description |
---|---|
SequenceInputStream |
Initializes a newly created SequenceInputStream by remembering the two arguments, which will be read in order, first s1 and then s2 , to provide the bytes to be read from this SequenceInputStream . |
SequenceInputStream |
Initializes a newly created SequenceInputStream by remembering the argument, which must be an Enumeration that produces objects whose run-time type is InputStream . |
Modifier and Type | Method | Description |
---|---|---|
int |
available() |
Returns an estimate of the number of bytes that can be read (or skipped over) from the current underlying input stream without blocking by the next invocation of a method for the current underlying input stream. |
void |
close() |
Closes this input stream and releases any system resources associated with the stream. |
int |
read() |
Reads the next byte of data from the input stream. |
int |
read |
Reads up to len bytes of data from this input stream into an array of bytes. |
mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skip, skipNBytes, transferTo
public SequenceInputStream(Enumeration<? extends InputStream> e)
SequenceInputStream
by remembering the argument, which must be an Enumeration
that produces objects whose run-time type is InputStream
. The input streams that are produced by the enumeration will be read, in order, to provide the bytes to be read from this SequenceInputStream
. After each input stream from the enumeration is exhausted, it is closed by calling its close
method.e
- an enumeration of input streams.public SequenceInputStream(InputStream s1, InputStream s2)
SequenceInputStream
by remembering the two arguments, which will be read in order, first s1
and then s2
, to provide the bytes to be read from this SequenceInputStream
.s1
- the first input stream to read.s2
- the second input stream to read.public int available() throws IOException
This method simply calls available
of the current underlying input stream and returns the result.
available
in class InputStream
0
if this input stream has been closed by invoking its close()
methodIOException
- if an I/O error occurs.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. This method tries to read one byte from the current substream. If it reaches the end of the stream, it calls the close
method of the current substream and begins reading from the next substream.
read
in class InputStream
-1
if the end of the stream is reached.IOException
- if an I/O error occurs.public int read(byte[] b, int off, int len) throws IOException
len
bytes of data from this input stream into an array of bytes. If the end of the last contained stream has been reached then -1
is returned. Otherwise, if len
is not zero, the method blocks until at least 1 byte of input is available; if len
is zero, no bytes are read and 0
is returned. The read
method of SequenceInputStream
tries to read the data from the current substream. If it fails to read any bytes because the substream has reached the end of the stream, it calls the close
method of the current substream and begins reading from the next substream.
read
in class InputStream
b
- the buffer into which the data is read.off
- the start offset in array b
at which the data is written.len
- the maximum number of bytes read.-1
if there is no more data because the end of the last contained stream has been reached.NullPointerException
- if the end of the last contained stream has not been reached and b
is null
.IndexOutOfBoundsException
- if the end of the last contained stream has not been reached and off
is negative, len
is negative, or len
is greater than b.length - off
IOException
- if an I/O error occurs.public void close() throws IOException
SequenceInputStream
cannot perform input operations and cannot be reopened. If this stream was created from an enumeration, all remaining elements are requested from the enumeration and closed before the close
method returns.
close
in interface AutoCloseable
close
in interface Closeable
close
in class InputStream
IOException
- if an I/O error occurs.
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/SequenceInputStream.html