LineNumberInputStream (Java Platform SE 7 ) (original) (raw)

• java.lang.Object

• • java.io.InputStream
  • • java.io.FilterInputStream
      • • java.io.LineNumberInputStream

• All Implemented Interfaces:
  Closeable, AutoCloseable

Deprecated.
This class incorrectly assumes that bytes adequately represent characters. As of JDK 1.1, the preferred way to operate on character streams is via the new character-stream classes, which include a class for counting line numbers.

@Deprecated
public class LineNumberInputStream
extends FilterInputStream
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 ('\r'), a newline character ('\n'), 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 by1 when a read returns a newline character.
Since:
JDK1.0
See Also:
LineNumberReader

• • Field Summary

     * ### Fields inherited from class java.io.[FilterInputStream](../../java/io/FilterInputStream.html "class in java.io")  
     `[in](../../java/io/FilterInputStream.html#in)`  

  • Constructor Summary

  Constructors

  Constructor and Description
  LineNumberInputStream(InputStream in) Deprecated. Constructs a newline number input stream that reads its input from the specified input stream.

  • Method Summary

  Methods

  Modifier and Type	Method and Description
  int	available() Deprecated. Returns the number of bytes that can be read from this input stream without blocking.
  int	getLineNumber() Deprecated. Returns the current line number.
  void	mark(int readlimit) Deprecated. Marks the current position in this input stream.
  int	read() Deprecated. Reads the next byte of data from this input stream.
  int	read(byte[] b, int off, int len) Deprecated. Reads up to len bytes of data from this input stream into an array of bytes.
  void	reset() Deprecated. Repositions this stream to the position at the time themark method was last called on this input stream.
  void	setLineNumber(int lineNumber) Deprecated. Sets the line number to the specified argument.
  long	skip(long n) Deprecated. Skips over and discards n bytes of data from this input stream.

     * ### Methods inherited from class java.io.[FilterInputStream](../../java/io/FilterInputStream.html "class in java.io")  
     `[close](../../java/io/FilterInputStream.html#close%28%29), [markSupported](../../java/io/FilterInputStream.html#markSupported%28%29), [read](../../java/io/FilterInputStream.html#read%28byte[]%29)`  
     * ### Methods inherited from class java.lang.[Object](../../java/lang/Object.html "class in java.lang")  
     `[clone](../../java/lang/Object.html#clone%28%29), [equals](../../java/lang/Object.html#equals%28java.lang.Object%29), [finalize](../../java/lang/Object.html#finalize%28%29), [getClass](../../java/lang/Object.html#getClass%28%29), [hashCode](../../java/lang/Object.html#hashCode%28%29), [notify](../../java/lang/Object.html#notify%28%29), [notifyAll](../../java/lang/Object.html#notifyAll%28%29), [toString](../../java/lang/Object.html#toString%28%29), [wait](../../java/lang/Object.html#wait%28%29), [wait](../../java/lang/Object.html#wait%28long%29), [wait](../../java/lang/Object.html#wait%28long,%20int%29)`

• • Constructor Detail

     * #### LineNumberInputStream  
     public LineNumberInputStream([InputStream](../../java/io/InputStream.html "class in java.io") in)  
     Deprecated.  
     Constructs a newline number input stream that reads its input from the specified input stream.  
     Parameters:  
     `in` \- the underlying input stream.  

  • Method Detail

    * #### read  
    public int read()  
             throws [IOException](../../java/io/IOException.html "class in java.io")  
    Deprecated.  
    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.  
    **Overrides:**  
    `[read](../../java/io/FilterInputStream.html#read%28%29)` in class `[FilterInputStream](../../java/io/FilterInputStream.html "class in java.io")`  
    Returns:  
    the next byte of data, or `-1` if the end of this stream is reached.  
    Throws:  
    `[IOException](../../java/io/IOException.html "class in java.io")` \- if an I/O error occurs.  
    See Also:  
    [FilterInputStream.in](../../java/io/FilterInputStream.html#in), [getLineNumber()](../../java/io/LineNumberInputStream.html#getLineNumber%28%29)  
    * #### read  
    public int read(byte[] b,  
           int off,  
           int len)  
             throws [IOException](../../java/io/IOException.html "class in java.io")  
    Deprecated.  
    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.  
    **Overrides:**  
    `[read](../../java/io/FilterInputStream.html#read%28byte[],%20int,%20int%29)` in class `[FilterInputStream](../../java/io/FilterInputStream.html "class in java.io")`  
    Parameters:  
    `b` \- the buffer into which the data is read.  
    `off` \- the start offset of the data.  
    `len` \- the maximum number of bytes read.  
    Returns:  
    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.  
    Throws:  
    `[IOException](../../java/io/IOException.html "class in java.io")` \- if an I/O error occurs.  
    See Also:  
    [read()](../../java/io/LineNumberInputStream.html#read%28%29)  
    * #### skip  
    public long skip(long n)  
              throws [IOException](../../java/io/IOException.html "class in java.io")  
    Deprecated.  
    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.  
    **Overrides:**  
    `[skip](../../java/io/FilterInputStream.html#skip%28long%29)` in class `[FilterInputStream](../../java/io/FilterInputStream.html "class in java.io")`  
    Parameters:  
    `n` \- the number of bytes to be skipped.  
    Returns:  
    the actual number of bytes skipped.  
    Throws:  
    `[IOException](../../java/io/IOException.html "class in java.io")` \- if an I/O error occurs.  
    See Also:  
    [FilterInputStream.in](../../java/io/FilterInputStream.html#in)  
    * #### setLineNumber  
    public void setLineNumber(int lineNumber)  
    Deprecated.  
    Sets the line number to the specified argument.  
    Parameters:  
    `lineNumber` \- the new line number.  
    See Also:  
    [getLineNumber()](../../java/io/LineNumberInputStream.html#getLineNumber%28%29)  
    * #### getLineNumber  
    public int getLineNumber()  
    Deprecated.  
    Returns the current line number.  
    Returns:  
    the current line number.  
    See Also:  
    [setLineNumber(int)](../../java/io/LineNumberInputStream.html#setLineNumber%28int%29)  
    * #### available  
    public int available()  
                  throws [IOException](../../java/io/IOException.html "class in java.io")  
    Deprecated.  
    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 `'\r'` and`'\n'`, which are converted to just_k_/2 `'\n'` characters.  
    **Overrides:**  
    `[available](../../java/io/FilterInputStream.html#available%28%29)` in class `[FilterInputStream](../../java/io/FilterInputStream.html "class in java.io")`  
    Returns:  
    the number of bytes that can be read from this input stream without blocking.  
    Throws:  
    `[IOException](../../java/io/IOException.html "class in java.io")` \- if an I/O error occurs.  
    See Also:  
    [FilterInputStream.in](../../java/io/FilterInputStream.html#in)  
    * #### mark  
    public void mark(int readlimit)  
    Deprecated.  
    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.  
    **Overrides:**  
    `[mark](../../java/io/FilterInputStream.html#mark%28int%29)` in class `[FilterInputStream](../../java/io/FilterInputStream.html "class in java.io")`  
    Parameters:  
    `readlimit` \- the maximum limit of bytes that can be read before the mark position becomes invalid.  
    See Also:  
    [FilterInputStream.in](../../java/io/FilterInputStream.html#in), [reset()](../../java/io/LineNumberInputStream.html#reset%28%29)  
    * #### reset  
    public void reset()  
               throws [IOException](../../java/io/IOException.html "class in java.io")  
    Deprecated.  
    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.  
    **Overrides:**  
    `[reset](../../java/io/FilterInputStream.html#reset%28%29)` in class `[FilterInputStream](../../java/io/FilterInputStream.html "class in java.io")`  
    Throws:  
    `[IOException](../../java/io/IOException.html "class in java.io")` \- if an I/O error occurs.  
    See Also:  
    [FilterInputStream.in](../../java/io/FilterInputStream.html#in), [mark(int)](../../java/io/LineNumberInputStream.html#mark%28int%29)

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2020, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.