list_traverser.h

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// Based on "Design Patterns: Elements of Reusable Object-Oriented Software"
// book by Erich Gamma, John Vlissides, Ralph Johnson, and Richard Helm 
//
// Created by Bartosz Rachwal. The National Institute of Advanced Industrial Science and Technology, Japan.

#ifndef OPERATIONAL_ITERATOR_LIST_TRAVERSER_H_
#define OPERATIONAL_ITERATOR_LIST_TRAVERSER_H_

#include "list.h"
#include "list_iterator.h"

namespace operational
{
namespace iterator
{
template<class Item>
class ListTraverser
{
    public:
    explicit ListTraverser(List<Item>* list);
    virtual ~ListTraverser();

    virtual bool Traverse();

    protected:
    virtual bool ProcessItem(const Item&) = 0;

    private:
    ListIterator<Item> iterator_;
};

template<class Item>
ListTraverser<Item>::ListTraverser(List<Item>* list) : iterator_(list) { }

template<class Item>
ListTraverser<Item>::~ListTraverser() { }

template<class Item>
bool ListTraverser<Item>::Traverse()
{
    auto result = false;

    for (iterator_.First(); !iterator_.IsDone(); iterator_.Next())
    {
        result = ProcessItem(iterator_.CurrentItem());
        if (result == false)
        {
            break;
        }
    }
    return result;
}
}
}

#endif