Added in API level 1
Deprecated in API level 1

LineNumberInputStream

open class LineNumberInputStream : FilterInputStream
kotlin.Any
   ↳ java.io.InputStream
   ↳ java.io.FilterInputStream
   ↳ java.io.LineNumberInputStream

This class is an input stream filter that provides the added functionality of keeping track of the current line number.

A line is a sequence of bytes ending with a carriage return character ('\u005Cr'), a newline character ('\u005Cn'), or a carriage return character followed immediately by a linefeed character. In all three cases, the line terminating character(s) are returned as a single newline character.

The line number begins at 0, and is incremented by 1 when a read returns a newline character.

Summary

Public constructors

Constructs a newline number input stream that reads its input from the specified input stream.

Public methods
open Int

Returns the number of bytes that can be read from this input stream without blocking.

open Int

Returns the current line number.

open Unit
mark(readlimit: Int)

Marks the current position in this input stream.

open Int

Reads the next byte of data from this input stream.

open Int
read(b: ByteArray!, off: Int, len: Int)

Reads up to len bytes of data from this input stream into an array of bytes.

open Unit

Repositions this stream to the position at the time the mark method was last called on this input stream.

open Unit
setLineNumber(lineNumber: Int)

Sets the line number to the specified argument.

open Long
skip(n: Long)

Skips over and discards n bytes of data from this input stream.

Inherited functions
Inherited properties

Public constructors

LineNumberInputStream

Added in API level 1
LineNumberInputStream(in: InputStream!)

Constructs a newline number input stream that reads its input from the specified input stream.

Parameters
in InputStream!: the underlying input stream.

Public methods

available

Added in API level 1
open fun available(): Int

Deprecated: Deprecated in Java.

Returns the number of bytes that can be read from this input stream without blocking.

Note that if the underlying input stream is able to supply k input characters without blocking, the LineNumberInputStream can guarantee only to provide k/2 characters without blocking, because the k characters from the underlying input stream might consist of k/2 pairs of '\u005Cr' and '\u005Cn', which are converted to just k/2 '\u005Cn' characters.

Return
Int the number of bytes that can be read from this input stream without blocking.
Exceptions
java.io.IOException if an I/O error occurs.
java.io.IOException if an I/O error occurs.

getLineNumber

Added in API level 1
open fun getLineNumber(): Int

Deprecated: Deprecated in Java.

Returns the current line number.

Return
Int the current line number.

See Also

mark

Added in API level 1
open fun mark(readlimit: Int): Unit

Deprecated: Deprecated in Java.

Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes.

The mark method of LineNumberInputStream remembers the current line number in a private variable, and then calls the mark method of the underlying input stream.

Parameters
readlimit Int: the maximum limit of bytes that can be read before the mark position becomes invalid.

read

Added in API level 1
open fun read(): Int

Deprecated: Deprecated in Java.

Reads the next byte of data from this 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.

The read method of LineNumberInputStream calls the read method of the underlying input stream. It checks for carriage returns and newline characters in the input, and modifies the current line number as appropriate. A carriage-return character or a carriage return followed by a newline character are both converted into a single newline character.

Return
Int the next byte of data, or -1 if the end of this stream is reached.
Exceptions
java.io.IOException if an I/O error occurs.
java.io.IOException if an I/O error occurs.

read

Added in API level 1
open fun read(
    b: ByteArray!,
    off: Int,
    len: Int
): Int

Deprecated: Deprecated in Java.

Reads up to len bytes of data from this input stream into an array of bytes. This method blocks until some input is available.

The read method of LineNumberInputStream repeatedly calls the read method of zero arguments to fill in the byte array.

Parameters
b ByteArray!: the buffer into which the data is read.
off Int: the start offset of the data.
len Int: the maximum number of bytes read.
Return
Int the total number of bytes read into the buffer, or -1 if there is no more data because the end of this stream has been reached.
Exceptions
java.io.IOException If the first byte cannot be read for any reason other than end of file, or if the input stream has been closed, or if some other I/O error occurs.
java.lang.NullPointerException If b is null.
java.lang.IndexOutOfBoundsException If off is negative, len is negative, or len is greater than b.length - off
java.io.IOException if an I/O error occurs.

See Also

    reset

    Added in API level 1
    open fun reset(): Unit

    Deprecated: Deprecated in Java.

    Repositions this stream to the position at the time the mark method was last called on this input stream.

    The reset method of LineNumberInputStream resets the line number to be the line number at the time the mark method was called, and then calls the reset method of the underlying input stream.

    Stream marks are intended to be used in situations where you need to read ahead a little to see what's in the stream. Often this is most easily done by invoking some general parser. If the stream is of the type handled by the parser, it just chugs along happily. If the stream is not of that type, the parser should toss an exception when it fails, which, if it happens within readlimit bytes, allows the outer code to reset the stream and try another parser.

    Exceptions
    java.io.IOException if this stream has not been marked or if the mark has been invalidated.
    java.io.IOException if an I/O error occurs.

    setLineNumber

    Added in API level 1
    open fun setLineNumber(lineNumber: Int): Unit

    Deprecated: Deprecated in Java.

    Sets the line number to the specified argument.

    Parameters
    lineNumber Int: the new line number.

    See Also

    skip

    Added in API level 1
    open fun skip(n: Long): Long

    Deprecated: Deprecated in Java.

    Skips over and discards n bytes of data from this input stream. The skip method may, for a variety of reasons, end up skipping over some smaller number of bytes, possibly 0. The actual number of bytes skipped is returned. If n is negative, no bytes are skipped.

    The skip method of LineNumberInputStream creates a byte array and then repeatedly reads into it until n bytes have been read or the end of the stream has been reached.

    Parameters
    n Long: the number of bytes to be skipped.
    Return
    Long the actual number of bytes skipped.
    Exceptions
    java.io.IOException if in.skip(n) throws an IOException.
    java.io.IOException if an I/O error occurs.