141 lines
3.7 KiB
C#
141 lines
3.7 KiB
C#
using ProjectCruiser.Exceptions;
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namespace ProjectCruiser.CollectionGenericObj;
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public class ArrayGenObj<T> : ICollectionGenObj<T>
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where T : class
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{
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// Массив объектов, которые храним
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private T?[] _collection;
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// Максимально допустимое число объектов в массиве
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private int _maxCount;
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public int Count => _collection.Count(s => (s != null));
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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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_maxCount = value;
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if (_collection.Length == 0) _collection = new T?[value];
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else Array.Resize(ref _collection, value);
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}
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}
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}
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public CollectionType GetCollectionType => CollectionType.Array;
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public ArrayGenObj()
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{
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_collection = Array.Empty<T?>();
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}
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// methods :
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public T? GetItem(int index)
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{
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if (index > _maxCount)
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throw new CollectionOverflowException(index);
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if (index < 0)
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throw new PositionOutOfCollectionException(index);
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if (_collection[index] == null)
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throw new ObjectNotFoundException(index);
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return _collection[index];
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// CollectionOverflowException
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// PositionOutOfCollectionException
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// ObjectNotFoundException
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}
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public int Insert(T? item)
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{
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if (item == null) throw
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new NullReferenceException("> Inserting item is null");
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// выход за границы, курируется CollectionOverflowException
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if (Count >= _maxCount) throw new CollectionOverflowException(Count);
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// any empty place -> fill immediately
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for (int i = Count; i < _maxCount; i++)
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{
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if (_collection[i] == null)
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{
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_collection[i] = item;
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return i;
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}
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}
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return Count;
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// NullReferenceException
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// CollectionOverflowException
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}
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public int Insert(T? item, int index)
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{
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if (index < 0 || index >= _maxCount) throw new PositionOutOfCollectionException(index);
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if (Count >= _maxCount) throw new CollectionOverflowException(Count);
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if (item == null) throw
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new NullReferenceException("> Inserting item (at position) is null");
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if (_collection[index] == null)
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{
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_collection[index] = item;
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return index;
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}
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else
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{
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int min_diff = 100, firstNullIndex = 100;
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for (int i = 0; i < Count; i++)
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{
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if (_collection[i] == null && min_diff > Math.Abs(index - i))
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{
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min_diff = Math.Abs(index - i);
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firstNullIndex = i;
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}
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}
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_collection[firstNullIndex] = item;
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return firstNullIndex;
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}
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// PositionOutOfCollectionException
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// CollectionOverflowException
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// NullReferenceException
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}
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public T? Remove(int index)
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{
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if (index >= _maxCount || index < 0)
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// on the other positions items don't exist
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{
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throw new PositionOutOfCollectionException(index);
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}
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T? item = _collection[index];
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_collection[index] = null;
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if (item == null) throw new ObjectNotFoundException(index);
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return item;
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// PositionOutOfCollectionException
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// ObjectNotFoundException
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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 < MaxCount; ++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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}
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