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Class LineWriter

Object
  Writer
      FilterWriter
          LineWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable

public class LineWriter
extends FilterWriter

Writes characters to a stream while replacing various EOL by a unique string. This class catches all occurrences of "\r", "\n" and "\r\n", and replaces them by the platform depend EOL string ("\r\n" on Windows, "\n" on Unix), or any other EOL explicitly set at construction time. This writer also remove trailing blanks before end of lines, but this behavior can be changed by overriding isWhitespace(char).

Since:

2.0

Author:

Martin Desruisseaux (IRD)

Field Summary

Fields inherited from class FilterWriter

out

Fields inherited from class Writer

lock

Constructor Summary

LineWriter(Writer out)
Constructs a LineWriter object that will use the platform dependent line separator.

LineWriter(Writer out, String lineSeparator)
Constructs a LineWriter object that will use the specified line separator.

Method Summary

void	flush() Flushs the stream's content to the underlying stream.
String	getLineSeparator() Returns the current line separator.
protected boolean	isWhitespace(char c) Returns true if the specified character is a white space that can be ignored on end of line.
void	setLineSeparator(String lineSeparator) Changes the line separator.
void	write(char[] cbuf, int offset, int length) Writes a portion of an array of characters.
void	write(int c) Writes a single character.
void	write(String string, int offset, int length) Writes a portion of an array of a string.

Methods inherited from class FilterWriter

close

Methods inherited from class Writer

append, append, append, write, write

Methods inherited from class Object

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

Constructor Detail

LineWriter

public LineWriter(Writer out)

Constructs a LineWriter object that will use the platform dependent line separator.

Parameters:

out - A writer object to provide the underlying stream.

Throws:

IllegalArgumentException - if out is null.

LineWriter

public LineWriter(Writer out,
                  String lineSeparator)

Constructs a LineWriter object that will use the specified line separator.

Parameters:

out - A writer object to provide the underlying stream.

lineSeparator - String to use as line separator.

Throws:

IllegalArgumentException - if out or lineSeparator is null.

Method Detail

getLineSeparator

public String getLineSeparator()

Returns the current line separator.

Returns:

The current line separator.

setLineSeparator

public void setLineSeparator(String lineSeparator)

Changes the line separator. This is the string to insert in place of every occurences of "\r", "\n" or "\r\n".

Parameters:

lineSeparator - The new line separator.

Throws:

IllegalArgumentException - If lineSeparator is null.

write

public void write(int c)
           throws IOException

Writes a single character.

Overrides:

write in class FilterWriter

Throws:

IOException - If an I/O error occurs.

write

public void write(char[] cbuf,
                  int offset,
                  int length)
           throws IOException

Writes a portion of an array of characters.

Overrides:

write in class FilterWriter

Parameters:

cbuf - Buffer of characters to be written.

offset - Offset from which to start reading characters.

length - Number of characters to be written.

Throws:

IOException - If an I/O error occurs.

write

public void write(String string,
                  int offset,
                  int length)
           throws IOException

Writes a portion of an array of a string.

Overrides:

write in class FilterWriter

Parameters:

string - String to be written.

offset - Offset from which to start reading characters.

length - Number of characters to be written.

Throws:

IOException - If an I/O error occurs.

flush

public void flush()
           throws IOException

Flushs the stream's content to the underlying stream. This method flush completly all internal buffers, including any whitespace characters that should have been skipped if the next non-blank character is a line separator.

Specified by:

flush in interface Flushable

Overrides:

flush in class FilterWriter

Throws:

IOException - If an I/O error occurs.

isWhitespace

protected boolean isWhitespace(char c)
                        throws IOException

Returns true if the specified character is a white space that can be ignored on end of line. The default implementation returns Character.isSpaceChar(char). Subclasses can override this method in order to change the criterion.

Parameters:

c - The character to test.

Returns:

true if c is a character that can be ignored on end of line.

Throws:

IOException - if this method can not determine if the character is ignoreable.

Since:

2.5