//
// RecursiveDirectoryIteratorStategies.h
//
// $Id$
//
// Library: Foundation
// Package: Filesystem
// Module:  RecursiveDirectoryIterator
//
// Definitions of the RecursiveDirectoryIterator stategy classes.
//
// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef Foundation_RecursiveDirectoryIteratorStrategy_INCLUDE
#define Foundation_RecursiveDirectoryIteratorStrategy_INCLUDE

#include "Poco/Foundation.h"
#include "Poco/DirectoryIterator.h"
#include <stack>
#include <queue>
#include <functional>


namespace Poco
{

class Foundation_API TraverseBase
{
public:
	typedef std::stack<DirectoryIterator> Stack;
	typedef std::pointer_to_unary_function<const Stack&, UInt16> DepthFunPtr;

	enum
	{
		D_INFINITE = 0
	};
		/// Constant for infinite traverse depth.

	TraverseBase(DepthFunPtr depthDeterminer, UInt16 maxDepth = D_INFINITE);

protected:
	bool isFiniteDepth();

	DepthFunPtr _depthDeterminer;
	UInt16 _maxDepth;
	DirectoryIterator _itEnd;

private:
	TraverseBase();
	TraverseBase(const TraverseBase&);
	TraverseBase& operator=(const TraverseBase&);
};


class Foundation_API ChildrenFirstTraverse: public TraverseBase
{
public:
	ChildrenFirstTraverse(DepthFunPtr depthDeterminer, UInt16 maxDepth = D_INFINITE);

	const std::string next(Stack* itStack, bool* isFinished);

private:
	ChildrenFirstTraverse();
	ChildrenFirstTraverse(const ChildrenFirstTraverse&);
	ChildrenFirstTraverse& operator=(const ChildrenFirstTraverse&);
};


class Foundation_API SiblingsFirstTraverse: public TraverseBase
{
public:
	SiblingsFirstTraverse(DepthFunPtr depthDeterminer, UInt16 maxDepth = D_INFINITE);

	const std::string next(Stack* itStack, bool* isFinished);

private:
	SiblingsFirstTraverse();
	SiblingsFirstTraverse(const SiblingsFirstTraverse&);
	SiblingsFirstTraverse& operator=(const SiblingsFirstTraverse&);

	std::stack<std::queue<std::string> > _dirsStack;
};


} // namespace Poco

#endif // Foundation_RecursiveDirectoryIteratorStrategy_INCLUDE