Closeable, AutoCloseable
A 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.
Constructors
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.
Initializes a newly created SequenceInputStream by remembering the argument, which must be an Enumeration that produces objects whose run-time type is InputStream.
int
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
Closes this input stream and releases any system resources associated with the stream.
int
Reads the next byte of data from the input stream.
int
read(byte[] b, int off, int len)
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 Methods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitInitializes a newly created 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.
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.
s1 - the first input stream to read.
s2 - the second input stream to read.
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() method
IOException - if an I/O error occurs.
Reads the next byte of data from the input stream. The value byte is returned as an
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.
throws
IOExceptionReads up to
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.
Closes this input stream and releases any system resources associated with the stream. A closed
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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