120 lines
3.2 KiB
C#
120 lines
3.2 KiB
C#
using ProjectCruiser.DrawningSamples;
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using ProjectCruiser.Exceptions;
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namespace ProjectCruiser.CollectionGenericObj;
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// Параметризованный набор объектов
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public class ListGenObj<T> : ICollectionGenObj<T>
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where T : class
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{
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// Список объектов, которые храним
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private List<T?> _collection;
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// Максимально допустимое число объектов в списке
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private int _maxCount;
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public int Count => _collection.Count;
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public int MaxCount
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{
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get { return _maxCount; }
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set
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{
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if (value > 0)
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{
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if (_collection.Count == 0) _collection = new List<T>(value);
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else _collection.Capacity = value; // instead of resizing
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_maxCount = value;
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}
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}
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}
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public CollectionType GetCollectionType => CollectionType.List;
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public ListGenObj()
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{
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_collection = new();
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}
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public T? GetItem(int position)
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{
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if (position > _maxCount)
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throw new CollectionOverflowException(position);
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if (position < 0)
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throw new PositionOutOfCollectionException(position);
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if (_collection[position] == null)
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throw new ObjectNotFoundException(position);
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return _collection[position];
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}
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public int Insert(T? obj, IEqualityComparer<DrawningBase?>? cmpr = null)
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{
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if (obj == null)
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throw new NullReferenceException("> Inserting object is null");
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else
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{
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if (cmpr != null && obj == cmpr)
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{
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throw new Exception();
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}
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}
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// выход за границы, курируется CollectionOverflowException
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if (Count >= _maxCount) throw new CollectionOverflowException(Count);
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_collection.Add(obj);
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return Count;
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}
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public int Insert(T? obj, int position, IEqualityComparer<DrawningBase?>? cmpr = null)
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{
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if (position < 0 || position >= _maxCount)
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throw new PositionOutOfCollectionException(position);
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if (Count >= _maxCount) throw new CollectionOverflowException(Count);
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if (obj == null)
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throw new NullReferenceException("> Inserting object (at position) is null");
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else
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{
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if (cmpr != null && obj == cmpr)
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{
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throw new Exception();
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}
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}
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_collection.Insert(position, obj);
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return position;
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}
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public T? Remove(int position)
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{
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if (position >= _maxCount || position < 0)
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// on the other positions items don't exist
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{
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throw new PositionOutOfCollectionException(position);
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}
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T? item = _collection[position];
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_collection.RemoveAt(position);
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if (item == null) throw new ObjectNotFoundException(position);
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return item;
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}
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public IEnumerable<T?> GetItems()
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{
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for (int i = 0; i < _collection.Count; ++i)
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{
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yield return _collection[i];
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}
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}
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void ICollectionGenObj<T>.CollectionSort(IComparer<T?> comparer)
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{
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_collection.Sort(comparer);
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}
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}
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