org.mmbase.util.transformers
Class ChainedCharTransformer

java.lang.Object
  org.mmbase.util.transformers.ReaderTransformer
      org.mmbase.util.transformers.ChainedCharTransformer

All Implemented Interfaces:

CharTransformer, Transformer

public class ChainedCharTransformer

extends ReaderTransformer

implements CharTransformer

A CharTransformer which wraps N other CharTransformers, and links them with N - 1 new Threads, effectively working as a 'chained' transformer. The first transformation is done by the ChainedCharTransformer instance itself, after starting the N - 1 Threads for the other N - 1 transformations. If no CharTransformers are added, and 'transform' is called, logically, nothing will happen. Add the CopyCharTransformer if necessary. Schematicly:

  new ChainedCharTransformer().add(T1).add(T2)....add(TN).transform(R, W);

  ___________  __________       _________
 /           \/          \     /         \
 |  R  --> PW - PR --> PW -...- PR --> W  |
 |     T1     |    T2     |    |   TN     |
 \___________/ \_________/     \_________/


 R: reader, PR: piped reader, W: writer, PW, piped writer, T1 - TN: transformers

  

Since:

MMBase-1.7

Version:

$Id: ChainedCharTransformer.java,v 1.15 2004/01/05 17:39:07 michiel Exp $

Author:

Michiel Meeuwissen

Constructor Summary

ChainedCharTransformer()

Method Summary

ChainedCharTransformer	add(CharTransformer ct) Adds a CharTranformer to the chain of CharTransformers.
ChainedCharTransformer	addAll(java.util.Collection col) Adds a Collection of CharTranformers to the chain of CharTransformers.
static void	main(java.lang.String[] args)
java.lang.String	toString()
java.io.Writer	transform(java.io.Reader startReader, java.io.Writer endWriter)

Methods inherited from class org.mmbase.util.transformers.ReaderTransformer

transform, transform, transformBack, transformBack, transformBack

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.mmbase.util.transformers.CharTransformer

transform, transform, transformBack, transformBack, transformBack

Constructor Detail

ChainedCharTransformer

public ChainedCharTransformer()

Method Detail

add

public ChainedCharTransformer add(CharTransformer ct)

Adds a CharTranformer to the chain of CharTransformers. If the CharTransformer is a ChainedCharTransformer, then it will not be added itself, but its elements will be added.

addAll

public ChainedCharTransformer addAll(java.util.Collection col)

Adds a Collection of CharTranformers to the chain of CharTransformers.

Throws:

java.lang.ClassCastException - if collecion does not contain only CharTransformers

transform

public java.io.Writer transform(java.io.Reader startReader,
                                java.io.Writer endWriter)

Specified by:

transform in interface CharTransformer

Specified by:

transform in class ReaderTransformer

toString

public java.lang.String toString()

Specified by:

toString in interface Transformer

main

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

Throws:

java.io.IOException