Class: java.io.SequenceInputStream

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.
Authors:
@author Author van Hoff
Version:
@version 1.28, 05/12/04
Since:
@since JDK1.0

Inheritance

Superclass tree: Implements:

Methods

  • SequenceInputStreamtop

    public SequenceInputStream(InputStream s1, InputStream s2)
    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.
    Parameters:
    @param s1 the first input stream to read.
    @param s2 the second input stream to read.
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  • SequenceInputStreamtop

    public SequenceInputStream(Enumeration<? extends InputStream> e)
    Initializes 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.
    Parameters:
    @param e an enumeration of input streams.
    See:
    @see java.util.Enumeration
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  • availabletop

    public int available() throws IOException
    Returns the number of bytes available on the current stream.
    Return:
    @return the number of bytes that can be read from this input stream without blocking.
    Exceptions:
    @exception IOException if an I/O error occurs.
    Since:
    @since JDK1.1
    Override hierarchy:
    available from InputStream
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  • closetop

    public void close() throws IOException
    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. of InputStream .

    Exceptions:
    @exception IOException if an I/O error occurs.
    Specified by:
    close from Closeable
    Override hierarchy:
    close from InputStream
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  • readtop

    public int read() throws IOException
    Reads the next byte of data from this input stream. The 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 character 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.

    Return:
    @return the next byte of data, or -1 if the end of the stream is reached.
    Exceptions:
    @exception IOException if an I/O error occurs.
    Override hierarchy:
    read from InputStream
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  • readtop

    public int read(byte[] b, int off, int len) throws IOException
    Reads up to len bytes of data from this input stream into an array of bytes. This method blocks until at least 1 byte of input is available. If the first argument is null, up to len bytes are read and discarded.

    The read method of SequenceInputStream tries to read the data from the current substream. If it fails to read any characters 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.

    Parameters:
    @param b the buffer into which the data is read.
    @param off the start offset of the data.
    @param len the maximum number of bytes read.
    Return:
    @return int the number of bytes read.
    Exceptions:
    @exception IOException if an I/O error occurs.
    Override hierarchy:
    read from InputStream
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