PIRL.Utilities
Class Suspendable_Styled_Writer

java.lang.Object
  java.io.Writer
      PIRL.Utilities.Suspendable_Styled_Writer

All Implemented Interfaces:

Closeable, Flushable, Appendable, Styled_Writer

public class Suspendable_Styled_Writer
extends Writer
implements Styled_Writer

A Suspendable_Styled_Writer is a Writer that can have its output operations suspended.

All output methods are forwarded to the backing Writer. However, output may be suspended, in which case no output will occur until the suspension has been lifted.

The Styled_Writer interface is also implemented such that if the backing Writer implements Styled_Writer that interface is used, otherwise the usual Writer API is used instead in which case no style information will be forwarded.

Version:

1.7

Author:

Bradford Castalia - UA/PIRL

See Also:

Writer, Styled_Writer

Field Summary

boolean	Active The suspension state of the Writer.
static String	ID Class identification name with source code version and date.

Fields inherited from class java.io.Writer

lock

Constructor Summary

Suspendable_Styled_Writer(Writer writer)
Construct a Suspendable_Styled_Writer.

Suspendable_Styled_Writer(Writer writer, boolean active)
Construct a Suspendable_Styled_Writer with suspension specified.

Method Summary

void	close() Close the writer.
void	flush() Flush the writer.
void	Suspend(boolean suspend) Turn output suspension on or off.
boolean	Suspended() Test if output has been suspended.
void	write(char[] characters) Write an array of characters.
void	write(char[] characters, int offset, int amount) Write a portion of an array of characters.
void	write(int character) Write a character.
void	write(String string) Write a String.
Styled_Writer	Write(String text) Write plain text.
Styled_Writer	Write(String text, AttributeSet style) Write styled text.
void	write(String string, int offset, int amount) Write a portion of a String.
Writer	Writer() Get the Writer to which all Write methods are forwarded.

Methods inherited from class java.io.Writer

append, append, append

Methods inherited from class java.lang.Object

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

Field Detail

ID

public static final String ID

Class identification name with source code version and date.

See Also:

Constant Field Values

Active

public volatile boolean Active

The suspension state of the Writer.

When Active is true all output methods will forward to the Writer on which the object was constructed.

Constructor Detail

Suspendable_Styled_Writer

public Suspendable_Styled_Writer(Writer writer)

Construct a Suspendable_Styled_Writer.

The intial state of the Writer is determined by the flag.

Parameters:

writer - The Writer to use for all write operations.

Throws:

IllegalArgumentException - If the writer is null.

Suspendable_Styled_Writer

public Suspendable_Styled_Writer(Writer writer,
                                 boolean active)

Construct a Suspendable_Styled_Writer with suspension specified.

Parameters:

writer - The Writer to use for all write operations.

active - The initial state of the Writer. If true writes will occure; if false writes are suspended.

Throws:

IllegalArgumentException - If the writer is null.

Method Detail

Writer

public Writer Writer()

Get the Writer to which all Write methods are forwarded.

Returns:

A Writer.

Suspended

public boolean Suspended()

Test if output has been suspended.

Returns:

true if output has been suspended; false otherwise.

See Also:

Suspend(boolean)

Suspend

public void Suspend(boolean suspend)

Turn output suspension on or off.

Parameters:

suspend - If true subsequent output will be suspended; if false output will occur.

write

public void write(char[] characters,
                  int offset,
                  int amount)
           throws IOException

Write a portion of an array of characters.

Nothing is done if the Writer is suspended.

Specified by:

write in class Writer

Parameters:

characters - The char array containing the characters to be written. If null or empty nothing is done.

offset - Array offset from which to start writing characters.

amount - The number of characters to write.

Throws:

IOException - If the Writer throws an exception.

write

public void write(char[] characters)
           throws IOException

Write an array of characters.

Nothing is done if the Writer is suspended.

Overrides:

write in class Writer

Parameters:

characters - The char array containing the characters to be written.

Throws:

IOException - If the Writer throws an exception.

write

public void write(int character)
           throws IOException

Write a character.

Nothing is done if the Writer is suspended.

Overrides:

write in class Writer

Parameters:

character - The character to be written in the 16 low-order bits..

Throws:

IOException - If the Writer throws an exception.

write

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

Write a portion of a String.

Nothing is done if the Writer is suspended.

Overrides:

write in class Writer

Parameters:

string - The String containing the characters to be written.

offset - String offset from which to start writing characters.

amount - The number of characters to write.

Throws:

IOException - If the Writer throws an exception.

write

public void write(String string)
           throws IOException

Write a String.

Nothing is done if the Writer is suspended.

Overrides:

write in class Writer

Parameters:

string - The String containing the characters to be written. If null or empty nothing is done.

Throws:

IOException - If the Writer throws an exception.

flush

public void flush()
           throws IOException

Flush the writer.

Nothing is done if the Writer is suspended.

Specified by:

flush in interface Flushable

Specified by:

flush in class Writer

Throws:

IOException - If the Writer throws an exception.

close

public void close()
           throws IOException

Close the writer.

N.B.: The Writer will be closed regardless of whether writing has been suspended or not.

Specified by:

close in interface Closeable

Specified by:

close in class Writer

Throws:

IOException - If the Writer throws an exception.

Write

public Styled_Writer Write(String text,
                           AttributeSet style)
                    throws IOException

Write styled text.

Specified by:

Write in interface Styled_Writer

Parameters:

text - The text String to be written.

style - The AttributeSet to be applied to the text. This may be null if plain text is to be displayed.

Returns:

This Suspendable_Styled_Writer

Throws:

IOException - If the Writer throws an exception.

See Also:

Styled_Writer.Write(String, AttributeSet)

Write

public Styled_Writer Write(String text)
                    throws IOException

Write plain text.

This is the same as writing text with a null style.

Specified by:

Write in interface Styled_Writer

Parameters:

text - The text String to be written.

Returns:

This Suspendable_Styled_Writer

Throws:

IOException - If the Writer throws an exception.