net.sf.beanlib.io
Class FastLineNumberReader

java.lang.Object
  java.io.Reader
      net.sf.beanlib.io.FastLineNumberReader

All Implemented Interfaces:

Closeable, Readable

public class FastLineNumberReader
extends Reader

A non-thread-safe fast line number reader that preserves the end-of-line character(s). Code is originally based on BufferedReader.

Author:

Joe D. Velopar

Nested Class Summary

private static class

FastLineNumberReader.EolEnum End-of-line enums.

Field Summary

private char[]	charbuf Character buffer.
private boolean	checkNextLF True iff we need to read in more data into the character buffer to check if the next char is a LF; False otherwise.
private static int	DEFAULT_CHAR_BUFFER_SIZE
private static int	DEFAULT_LINE_LENGTH
private FastLineNumberReader.EolEnum	eolEnum Last End of line.
private int	lineNumber Current line number.
private int	nextCharIdx Index to the next character.
private int	numCharInBuf Number of characters in the character buffer.
private Reader	reader The underlying reader.

Fields inherited from class java.io.Reader

lock

Constructor Summary

FastLineNumberReader(Reader in)
Create a buffering character-input stream that uses a default-sized input buffer.

FastLineNumberReader(Reader in, int sz)
Create a buffering character-input stream that uses an input buffer of the specified size.

Method Summary

void	close()
private void	fill() Reads and fills the internal character buffer.
int	getLineNumber() Returns the current line number.
int	read(char[] cbuf, int off, int len)
private int	read1(char[] cbuf, int off, int len)
String	readEndOfLine() Returns the end of line character(s) as string.
String	readLine() Returns the next line read.

Methods inherited from class java.io.Reader

mark, markSupported, read, read, read, ready, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_CHAR_BUFFER_SIZE

private static int DEFAULT_CHAR_BUFFER_SIZE

DEFAULT_LINE_LENGTH

private static int DEFAULT_LINE_LENGTH

reader

private Reader reader

The underlying reader.

charbuf

private char[] charbuf

Character buffer.

numCharInBuf

private int numCharInBuf

Number of characters in the character buffer.

nextCharIdx

private int nextCharIdx

Index to the next character.

checkNextLF

private boolean checkNextLF

True iff we need to read in more data into the character buffer to check if the next char is a LF; False otherwise.

lineNumber

private int lineNumber

Current line number.

eolEnum

private FastLineNumberReader.EolEnum eolEnum

Last End of line.

Constructor Detail

FastLineNumberReader

public FastLineNumberReader(Reader in,
                            int sz)

Create a buffering character-input stream that uses an input buffer of the specified size.

Parameters:

in - A Reader

sz - Input-buffer size

Throws:

IllegalArgumentException - If sz is <= 0

FastLineNumberReader

public FastLineNumberReader(Reader in)

Create a buffering character-input stream that uses a default-sized input buffer.

Parameters:

in - A Reader

Method Detail

fill

private void fill()
           throws IOException

Reads and fills the internal character buffer.

Throws:

IOException

read

public int read(char[] cbuf,
                int off,
                int len)
         throws IOException

Specified by:

read in class Reader

Throws:

IOException

read1

private int read1(char[] cbuf,
                  int off,
                  int len)
           throws IOException

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in class Reader

Throws:

IOException

readEndOfLine

public String readEndOfLine()
                     throws IOException

Returns the end of line character(s) as string.

Throws:

IOException

getLineNumber

public int getLineNumber()

Returns the current line number.

readLine

public String readLine()
                throws IOException

Returns the next line read.

Throws:

IOException