list_iterator.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_ITERATOR_H_
#define OPERATIONAL_ITERATOR_LIST_ITERATOR_H_

#include "iterator_interface.h"
#include "list_interface.h"

namespace operational
{
namespace iterator
{
template<class Item>
class ListIterator : public IteratorInterface<Item>
{
    public:
    explicit ListIterator(const ListInterface<Item>* list);
    virtual ~ListIterator() override;

    virtual void First() override;
    virtual void Next() override;
    virtual bool IsDone() const override;
    virtual Item CurrentItem() const override;

    private:
    const ListInterface<Item>* list_;
    long current_;
};

template<class Item>
ListIterator<Item>::ListIterator(const ListInterface<Item>* list) : list_(list), current_(0) { }

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

template<class Item>
void ListIterator<Item>::First()
{
    current_ = 0;
}

template<class Item>
void ListIterator<Item>::Next()
{
    current_++;
}

template<class Item>
bool ListIterator<Item>::IsDone() const
{
    return current_ >= list_->Count();
}

template<class Item>
Item ListIterator<Item>::CurrentItem() const
{
    if (IsDone())
    {
        return nullptr;
    }
    return list_->Get(current_);
}
}
}

#endif