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LineNumberInputStream


java.io

Class LineNumberInputStream

  • All Implemented Interfaces:
    Closeable, AutoCloseable

    Deprecated.

    @Deprecated
    public class LineNumberInputStream
    extends FilterInputStream
    Wraps an existing InputStream and counts the line terminators encountered while reading the data. Line numbering starts at 0. Recognized line terminator sequences are '\r', '\n' and "\r\n". When using read, line terminator sequences are always translated into '\n'.
    • 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.
    • 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()


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