com.compoze.util
Class SubstitutionWriter

java.lang.Object
  |
  +--java.io.Writer
        |
        +--java.io.FilterWriter
              |
              +--com.compoze.util.TextLineFilterWriter
                    |
                    +--com.compoze.util.SubstitutionWriter

public class SubstitutionWriter

extends TextLineFilterWriter

This class substitutes text in a string as its being written. It takes a Map of text to replace and looks for substitution variables marked by an escape string. The escape string must appear both before and after the substitution variable. For example: %%substvar%%.

Fields inherited from class java.io.FilterWriter

out

Fields inherited from class java.io.Writer

lock

Constructor Summary

SubstitutionWriter(java.io.Writer out, java.util.HashMap replacementMap)
Constructor.

SubstitutionWriter(java.io.Writer out, java.lang.String sEscapeString, java.util.HashMap replacementMap)
Constructor.

Method Summary

protected java.lang.String	filterLine(java.lang.String sLine) Filter a line of text.
static void	main(java.lang.String[] args) Exerciser.

Methods inherited from class com.compoze.util.TextLineFilterWriter

flush, write, write, write

Methods inherited from class java.io.FilterWriter

close

Methods inherited from class java.io.Writer

write, write

Methods inherited from class java.lang.Object

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

Constructor Detail

SubstitutionWriter

public SubstitutionWriter(java.io.Writer out,
                          java.lang.String sEscapeString,
                          java.util.HashMap replacementMap)

Constructor.

Parameters:

out - the underlying writer

replacementMap - a hash mapping substitution variables to replacement strings

sEscapeString - the string appearing before and after each subtitution variable

SubstitutionWriter

public SubstitutionWriter(java.io.Writer out,
                          java.util.HashMap replacementMap)

Constructor. The default escape string "%%" is used.

Parameters:

out - the underlying writer

replacementMap - a hash mapping substitution variables to replacement strings

Method Detail

filterLine

protected java.lang.String filterLine(java.lang.String sLine)

Filter a line of text. This actually performs the replacement.

Overrides:

filterLine in class TextLineFilterWriter

Parameters:

sLine - the line to write (does not include line termination characters)

Returns:

the filtered line

main

public static void main(java.lang.String[] args)

Exerciser.

Parameters:

args - the command line arguments (input file then name/value pairs)