MapWrapper.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
 
using java.lang;
 
namespace java.util
{
 
    class MapWrapper<TKey, TValue> : IDictionary<TKey, TValue>
    {
 
        readonly Map _map;
 
        public MapWrapper(Map map)
        {
            _map = map ?? throw new ArgumentNullException(nameof(map));
        }
 
        public TValue this[TKey key]
        {
            get => (TValue)_map.get(key);
            set => _map.put(key, value);
        }
 
        public ICollection<TKey> Keys => _map.keySet().AsCollection<TKey>();
 
        public ICollection<TValue> Values => _map.values().AsCollection<TValue>();
 
        public int Count => _map.size();
 
        public bool IsReadOnly => false;
 
        public void Add(TKey key, TValue value) => _map.put(key, value);
 
        public void Add(KeyValuePair<TKey, TValue> item) => _map.put(item.Key, item.Value);
 
        public void Clear() => _map.clear();
 
        public bool Contains(KeyValuePair<TKey, TValue> item)
        {
            return _map.containsKey(item.Key) && _map.get(item.Key).Equals(item.Value);
        }
 
        public bool ContainsKey(TKey key)
        {
            return _map.containsKey(key);
        }
 
        public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex)
        {
            foreach (var entry in this)
                array[arrayIndex++] = entry;
        }
 
        public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
        {
            return _map.entrySet().AsEnumerable<Map.Entry>().Select(i => new KeyValuePair<TKey, TValue>((TKey)i.getKey(), (TValue)i.getValue())).GetEnumerator();
        }
 
        public bool Remove(TKey key)
        {
            if (_map.containsKey(key))
            {
                _map.remove(key);
                return true;
            }
 
            return false;
        }
 
        public bool Remove(KeyValuePair<TKey, TValue> item)
        {
            return _map.remove(item.Key, item.Value);
        }
 
        public bool TryGetValue(TKey key, out TValue value)
        {
            if (_map.containsKey(key))
            {
                value = (TValue) _map.get(key);
                return true;
            }
 
            value = default!;
            return false;
        }
 
        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }
 
    }
 
}