de.lmu.ifi.dbs.elki.utilities.io

Class BufferedLineReader

java.lang.Object

de.lmu.ifi.dbs.elki.utilities.io.BufferedLineReader

All Implemented Interfaces:

AutoCloseable

Direct Known Subclasses:

TokenizedReader

public class BufferedLineReader
extends Object
implements AutoCloseable

Class for buffered IO, avoiding some of the overheads of the Java API. The main difference to the standard Java API is that this implementation will reuse the buffer. After a call to nextLine(), the buffer will be overwitten!

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field and Description
protected StringBuilder	buf The buffer we read the data into.
protected int	lineNumber Current line number.
private LineReader	reader Line reader.

Constructor Summary

Constructors

Constructor and Description
BufferedLineReader() Constructor.
BufferedLineReader(InputStream in) Constructor.
BufferedLineReader(InputStreamReader in) Constructor.
BufferedLineReader(LineReader in) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
CharSequence	getBuffer() Get the reader buffer.
int	getLineNumber() Get the current line number.
static int	lengthWithoutLinefeed(CharSequence line) Get the length of the string, not taking trailing linefeeds into account.
boolean	nextLine() Read the next line.
void	reset() Reset the current reader (but do not close the stream).
void	reset(InputStream in) Reset to a new line reader.
void	reset(InputStreamReader in) Reset to a new line reader.
void	reset(LineReader r) Reset to a new line reader.

Methods inherited from class java.lang.Object

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

Field Detail

reader

private LineReader reader

Line reader.

buf

protected StringBuilder buf

The buffer we read the data into.

lineNumber

protected int lineNumber

Current line number.

Constructor Detail

BufferedLineReader

public BufferedLineReader()

Constructor. Use reset() to assign an input stream.

BufferedLineReader

public BufferedLineReader(LineReader in)

Constructor.

Parameters:

in - Line reader

BufferedLineReader

public BufferedLineReader(InputStream in)

Constructor.

Parameters:

in - Input stream

BufferedLineReader

public BufferedLineReader(InputStreamReader in)

Constructor.

Parameters:

in - Input stream reader

Method Detail

reset

public void reset()

Reset the current reader (but do not close the stream).

reset

public void reset(LineReader r)

Reset to a new line reader. A previous reader will not be closed automatically!

Parameters:

r - New reader

reset

public void reset(InputStream in)

Reset to a new line reader. A previous stream will not be closed automatically!

Parameters:

in - New input stream reader

reset

public void reset(InputStreamReader in)

Reset to a new line reader. A previous stream will not be closed automatically!

Parameters:

in - New input stream reader

getBuffer

public CharSequence getBuffer()

Get the reader buffer. After a call to nextLine(), the buffer will be overwitten!

Returns:

Buffer.

getLineNumber

public int getLineNumber()

Get the current line number.

Returns:

Current line number

nextLine

public boolean nextLine()
                 throws IOException

Read the next line.

Returns:

true if another line was read successfully.

Throws:

IOException - on IO errors.

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Throws:

IOException

lengthWithoutLinefeed

public static int lengthWithoutLinefeed(CharSequence line)

Get the length of the string, not taking trailing linefeeds into account.

Parameters:

line - Input line

Returns:

Length