PIbd-12_Shurygin_D.I._Simple/ProjectSeaplane/ProjectSeaplane/CollectionGenericObjects/MassiveGenericObjects.cs

using ProjectSeaplane.Drawnings;
using ProjectSeaplane.Exceptions;

namespace ProjectSeaplane.CollectionGenericObjects;

/// <summary>
/// Параметризованный набор объектов
/// </summary>
/// <typeparam name="T">Параметр: ограничение - ссылочный тип</typeparam>
public class MassiveGenericObjects<T> : ICollectionGenericObjects<T>
    where T : class
{
    /// <summary>
    /// Массив объектов, которые храним
    /// </summary>
    private T?[] _collection;

    public int Count => _collection.Length;

    public int MaxCount
    {
        get
        {
            return _collection.Length;
        }

        set
        {
            if (value > 0)
            {
                if (_collection.Length > 0)
                {
                    Array.Resize(ref _collection, value);
                }
                else
                {
                    _collection = new T?[value];
                }
            }
        }
    }

    public CollectionType GetCollectionType => CollectionType.Massive;

    /// <summary>
    /// Конструктор
    /// </summary>
    public MassiveGenericObjects()
    {
        _collection = Array.Empty<T?>();
    }

    public T? Get(int position)
    {
        try
        {
            if (_collection[position] == null) throw new ObjectNotFoundException(position);
            return _collection[position];
        }
        catch (IndexOutOfRangeException)
        {
            throw new PositionOutOfCollectionException(position);
        }
    }

    public int Insert(T obj, IEqualityComparer<T?>? comparer = null)
    {
        return Insert(obj, 0, comparer);
    }

    public int Insert(T obj, int position, IEqualityComparer<T?>? comparer = null)
    {
        // DO
        if (position < 0 || position > _collection.Length - 1)
        {
            throw new PositionOutOfCollectionException();
        }
        if (comparer != null)
        {
            foreach (T? item in _collection)
            {
                if ((comparer as IEqualityComparer<DrawningPlane>).Equals(obj as DrawningPlane, item as DrawningPlane))
                    throw new ObjectNotUniqueException();
            }
        }

        for (int i = position; i < Count; i++)
        {
            if (_collection[i] == null)
            {
                _collection[i] = obj;
                return i;
            }
        }
        for (int i = position - 1; i >= 0; --i)
        {
            if (_collection[i] == null)
            {
                _collection[i] = obj;
                return i;
            }
        }
        throw new CollectionOverflowException(Count);
    }

    public T? Remove(int position)
    {
        try
        {
            T? obj = _collection[position];
            if (obj == null)
            {
                throw new ObjectNotFoundException(position);
            }
            _collection[position] = null;
            return obj;
        }
        catch (IndexOutOfRangeException)
        {
            throw new PositionOutOfCollectionException(position);
        }
    }

    public IEnumerable<T?> GetItems()
    {
        for (int i = 0; i < _collection.Length; ++i)
        {
            yield return _collection[i];
        }
    }

    public void CollectionSort(IComparer<T?> comparer)
    {
        Array.Sort(_collection, comparer);
        Array.Reverse(_collection);
    }
}