net.jangaroo.jooc
Class SubstitutingWriter

java.lang.Object
  java.io.Writer
      java.io.FilterWriter
          net.jangaroo.jooc.SubstitutingWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable

Direct Known Subclasses:

JsStringLiteralWriter

public abstract class SubstitutingWriter
extends FilterWriter

An SubstitutingWriter is a FilterWriter that replaces each character in the output stream with the String obtained by calling the abstract method substitute on the characters.

Characters for which substitute returns null are output verbatim.

The implementation is fairly efficient in the number of calls to the various out.write methods.

Author:

Axel Wienberg

Field Summary

Fields inherited from class java.io.FilterWriter

out

Fields inherited from class java.io.Writer

lock

Constructor Summary

SubstitutingWriter(Writer out)

Method Summary

protected abstract String	substitute(char c) What should be printed instead of character c?
void	write(char[] cbuf, int off, int len) Write a portion of an array of characters, applying the substitution.
void	write(int c) Write a single character, applying the substitution.
void	write(String str, int off, int len) Write a portion of a string, applying the substitution.
protected void	writeReplacement(String replacement)

Methods inherited from class java.io.FilterWriter

close, flush

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

Constructor Detail

SubstitutingWriter

public SubstitutingWriter(Writer out)

Method Detail

substitute

protected abstract String substitute(char c)

What should be printed instead of character c? This method is always called synchronized on out. Changes to the substitution function should therefore also be synchronized on out.

Parameters:

c - the character

Returns:

the string to be printed, or null for "no change", i.e. just c

writeReplacement

protected void writeReplacement(String replacement)
                         throws IOException

Throws:

IOException

write

public void write(int c)
           throws IOException

Write a single character, applying the substitution.

Overrides:

write in class FilterWriter

Throws:

IOException - If an I/O error occurs

write

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

Write a portion of an array of characters, applying the substitution.

Overrides:

write in class FilterWriter

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

Write a portion of a string, applying the substitution.

Overrides:

write in class FilterWriter

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