IT. Expert System.

All Implemented Interfaces:

Closeable, AutoCloseable

@Deprecated
public class LineNumberInputStream
extends FilterInputStream

• Field Summary

  • Fields inherited from class java.io.FilterInputStream

    in

• Constructor Summary

  Constructors

  Constructor and Description
  LineNumberInputStream(InputStream in) Deprecated. Constructs a new LineNumberInputStream on the InputStream in.

• Method Summary

  Methods

  Modifier and Type	Method and Description
  int	available() Deprecated. Returns an estimated number of bytes that can be read or skipped without blocking for more input.
  int	getLineNumber() Deprecated. Returns the current line number for this stream.
  void	mark(int readlimit) Deprecated. Sets a mark position in this stream.
  int	read() Deprecated. Reads a single byte from the filtered stream and returns it as an integer in the range from 0 to 255.
  int	read(byte[] buffer, int offset, int length) Deprecated. Reads at most length bytes from the filtered stream and stores them in the byte array buffer starting at offset.
  void	reset() Deprecated. Resets this stream to the last marked location.
  void	setLineNumber(int lineNumber) Deprecated. Sets the line number of this stream to the specified lineNumber.
  long	skip(long byteCount) Deprecated. Skips count number of bytes in this stream.

  • Methods inherited from class java.io.FilterInputStream

    close, markSupported

  • Methods inherited from class java.io.InputStream

    read

  • Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Detail

  • LineNumberInputStream

    public LineNumberInputStream(InputStream in)

    Deprecated.
    Constructs a new LineNumberInputStream on the InputStream in. Line numbers are counted for all data read from this stream.

    Warning: passing a null source creates an invalid LineNumberInputStream. All operations on such a stream will fail.

    Parameters:

    in - The non-null input stream to count line numbers.

• Method Detail

  • available

    public int available()
                  throws IOException

    Deprecated.
    Returns an estimated number of bytes that can be read or skipped without blocking for more input.

    Note that this method provides such a weak guarantee that it is not very useful in practice.

    Firstly, the guarantee is "without blocking for more input" rather than "without blocking": a read may still block waiting for I/O to complete — the guarantee is merely that it won't have to wait indefinitely for data to be written. The result of this method should not be used as a license to do I/O on a thread that shouldn't be blocked.

    Secondly, the result is a conservative estimate and may be significantly smaller than the actual number of bytes available. In particular, an implementation that always returns 0 would be correct. In general, callers should only use this method if they'd be satisfied with treating the result as a boolean yes or no answer to the question "is there definitely data ready?".

    Thirdly, the fact that a given number of bytes is "available" does not guarantee that a read or skip will actually read or skip that many bytes: they may read or skip fewer.

    It is particularly important to realize that you must not use this method to size a container and assume that you can read the entirety of the stream without needing to resize the container. Such callers should probably write everything they read to a ByteArrayOutputStream and convert that to a byte array. Alternatively, if you're reading from a file, File.length() returns the current length of the file (though assuming the file's length can't change may be incorrect, reading a file is inherently racy).

    The default implementation of this method in InputStream always returns 0. Subclasses should override this method if they are able to indicate the number of bytes available.

    Note that the source stream may just be a sequence of "\r\n" bytes which are converted into '\n' by this stream. Therefore, available returns only in.available() / 2 bytes as result.

    Overrides:

    available in class FilterInputStream

    Returns:

    the estimated number of bytes available

    Throws:

    IOException - if this stream is closed or an error occurs

  • getLineNumber

    public int getLineNumber()

    Deprecated.
    Returns the current line number for this stream. Numbering starts at 0.

    Returns:

    the current line number.

  • mark

    public void mark(int readlimit)

    Deprecated.
    Sets a mark position in this stream. The parameter readlimit indicates how many bytes can be read before the mark is invalidated. Sending reset() will reposition this stream back to the marked position, provided that readlimit has not been surpassed. The line number count will also be reset to the last marked line number count.

    This implementation sets a mark in the filtered stream.

    Overrides:

    mark in class FilterInputStream

    Parameters:

    readlimit - the number of bytes that can be read from this stream before the mark is invalidated.

    See Also:

    FilterInputStream.markSupported(), reset()

  • read

    public int read()
             throws IOException

    Deprecated.
    Reads a single byte from the filtered stream and returns it as an integer in the range from 0 to 255. Returns -1 if the end of this stream has been reached.

    The line number count is incremented if a line terminator is encountered. Recognized line terminator sequences are '\r', '\n' and "\r\n". Line terminator sequences are always translated into '\n'.

    Overrides:

    read in class FilterInputStream

    Returns:

    the byte read or -1 if the end of the filtered stream has been reached.

    Throws:

    IOException - if the stream is closed or another IOException occurs.

  • read

    public int read(byte[] buffer,
           int offset,
           int length)
             throws IOException

    Deprecated.
    Reads at most length bytes from the filtered stream and stores them in the byte array buffer starting at offset. Returns the number of bytes actually read or -1 if no bytes have been read and the end of this stream has been reached.

    The line number count is incremented if a line terminator is encountered. Recognized line terminator sequences are '\r', '\n' and "\r\n". Line terminator sequences are always translated into '\n'.

    Overrides:

    read in class FilterInputStream

    Parameters:

    buffer - the array in which to store the bytes read.

    offset - the initial position in buffer to store the bytes read from this stream.

    length - the maximum number of bytes to store in buffer.

    Returns:

    the number of bytes actually read or -1 if the end of the filtered stream has been reached while reading.

    Throws:

    IndexOutOfBoundsException - if offset < 0 or length < 0, or if offset + length is greater than the length of buffer.

    IOException - if this stream is closed or another IOException occurs.

    NullPointerException - if buffer is null.

  • reset

    public void reset()
               throws IOException

    Deprecated.
    Resets this stream to the last marked location. It also resets the line count to what is was when this stream was marked.

    Overrides:

    reset in class FilterInputStream

    Throws:

    IOException - if this stream is already closed, no mark has been set or the mark is no longer valid because more than readlimit bytes have been read since setting the mark.

    See Also:

    mark(int), FilterInputStream.markSupported()

  • setLineNumber

    public void setLineNumber(int lineNumber)

    Deprecated.
    Sets the line number of this stream to the specified lineNumber. Note that this may have side effects on the line number associated with the last marked position.

    Parameters:

    lineNumber - the new lineNumber value.

    See Also:

    mark(int), reset()

  • skip

    public long skip(long byteCount)
              throws IOException

    Deprecated.
    Skips count number of bytes in this stream. Subsequent calls to read will not return these bytes unless reset is used. This implementation skips byteCount bytes in the filtered stream and increments the line number count whenever line terminator sequences are skipped.

    Overrides:

    skip in class FilterInputStream

    Parameters:

    byteCount - the number of bytes to skip.

    Returns:

    the number of bytes actually skipped.

    Throws:

    IOException - if this stream is closed or another IOException occurs.

    See Also:

    mark(int), read(), reset()