/*
# ---------------------------------------------------------------------
#
# Copyright (c) CREATIS (Centre de Recherche en Acquisition et Traitement de l'Image 
#                        pour la Santé)
# Authors : Eduardo Davila, Frederic Cervenansky, Claire Mouton
# Previous Authors : Laurent Guigues, Jean-Pierre Roux
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*/

New architecture created on 04/02/09 following a MVC approach

Elements of the architecture:

* Data structure: Attributed tree
--------------------------------------
in namespace creaImageIO::tree
Tree :   Attributed tree structure
	 inherits Node
     	 holds a vector of root TreeNode 
TreeData : Abstract class to store user data on a tree
Node : 
	 belong to a Tree, 
	 holds a pointer on parent Node, 
	 holds a vector of children Node
NodeData : Abstract class to store user data on a tree node
Descriptor : Descriptor of the structure a tree (number of levels, descriptors of each level, ...)
	  
	 holds a vector of LevelDescriptor
LevelDescriptor : 
         holds a vector of TreeAttributeDescriptor
AttributeDescriptor :
	 stores name, dicom group/elem, flags
Comparator: Abstract definition of a comparator of Node
	    Comparison is done by operator()(Node* const &, Node* const &)
ComparatorWithOrder : Abstract Comparator whose order can be reversed
		    Concrete comparison is done by method compare(Node* const &, Node* const &)
LexicographicalComparator :  A Comparator which stores a vector of Comparators and which performs lexicographical comparison		    

IntComparator    : Compares the values of a given Attribute of the Nodes which is decoded as an int    value
FloatComparator  : Compares the values of a given Attribute of the Nodes which is decoded as a  float  value
StringComparator : Compares the values of a given Attribute of the Nodes which is decoded as a  string value


* Models : TreeHandler and descendants
--------------------------------------

TreeHandler : Abstract class which 'handles' a Tree structure.
	    Can:
	    Load the children of a given Node

SQLiteTreeHandler : Concrete TreeHandler which manages a tree stored in a sqlite database
CppSQLite3.h / CppSQLite3.cpp : C++ interface to sqlite db
...

ImageFinder : Parses (recursively) a part of a filesystem to look for known images and load their attributes in order to add the images to a Tree (submission via a TreeHandler::AddBranch)


* Image handling
----------------

creaImageIOImageReader.h/cpp :
SpecificImageReader
ImageReader

creaImageIOMultiThreadImageReader.h/cpp
creaImageIOIndexedHeap.h/cpp

* Views :
---------
TreeView
WxTreeView
WxGimmickView
QTreeView 
QGimmickView
...

* Controller :
--------------
Gimmick
...