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## 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%%.

Field Summary

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.

  Specified by:
    `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)

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