java.io
Class FilterWriter

java.lang.Object
  java.io.Writer
      java.io.FilterWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable

public abstract class FilterWriter
extends Writer

Abstract class for writing filtered character streams. The abstract class FilterWriter itself provides default methods that pass all requests to the contained stream. Subclasses of FilterWriter should override some of these methods and may also provide additional methods and fields.

Since:

JDK1.1

Field Summary

protected Writer

out The underlying character-output stream.

Fields inherited from class java.io.Writer

lock

Constructor Summary

protected

FilterWriter(Writer out) Create a new filtered writer.

Method Summary

void	close() Closes the stream, flushing it first.
void	flush() Flushes the stream.
void	write(char[] cbuf, int off, int len) Writes a portion of an array of characters.
void	write(int c) Writes a single character.
void	write(String str, int off, int len) Writes a portion of a string.

Methods inherited from class java.io.Writer

append, append, append, write, write

Methods inherited from class java.lang.Object

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

Field Detail

out

protected Writer out

The underlying character-output stream.

Constructor Detail

FilterWriter

protected FilterWriter(Writer out)

Create a new filtered writer.

Parameters:

out - a Writer object to provide the underlying stream.

Throws:

NullPointerException - if out is null

Method Detail

write

public void write(int c)
           throws IOException

Writes a single character.

Overrides:

write in class Writer

Parameters:

c - int specifying a character to be written

Throws:

IOException - If an I/O error occurs

write

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

Writes a portion of an array of characters.

Specified by:

write in class Writer

Parameters:

cbuf - Buffer of characters to be written

off - Offset from which to start reading characters

len - Number of characters to be written

Throws:

IOException - If an I/O error occurs

write

public void write(String str,
                  int off,
                  int len)
           throws IOException

Writes a portion of a string.

Overrides:

write in class Writer

Parameters:

str - String to be written

off - Offset from which to start reading characters

len - Number of characters to be written

Throws:

IOException - If an I/O error occurs

flush

public void flush()
           throws IOException

Flushes the stream.

Specified by:

flush in interface Flushable

Specified by:

flush in class Writer

Throws:

IOException - If an I/O error occurs

close

public void close()
           throws IOException

Description copied from class: Writer

Closes the stream, flushing it first. Once the stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. Closing a previously closed stream has no effect.

Specified by:

close in interface Closeable

Specified by:

close in class Writer

Throws:

IOException - If an I/O error occurs