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SubDictionary.cs
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105 lines (86 loc) · 2.61 KB
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namespace Simple.Data.Ado
{
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
internal class SubDictionary<TKey,TValue> : IDictionary<TKey,TValue>
{
private readonly IDictionary<TKey, TValue> _super;
private readonly Func<TKey, bool> _keyFilter;
private IEnumerable<KeyValuePair<TKey, TValue>> Filter()
{
return _super.Where(kvp => _keyFilter(kvp.Key));
}
public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
{
return Filter().GetEnumerator();
}
public void Add(KeyValuePair<TKey, TValue> item)
{
_super.Add(item);
}
public void Clear()
{
_super.Clear();
}
public bool Contains(KeyValuePair<TKey, TValue> item)
{
return _super.Contains(item);
}
public void CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex)
{
Filter().ToArray().CopyTo(array, arrayIndex);
}
public bool Remove(KeyValuePair<TKey, TValue> item)
{
return _super.Remove(item);
}
public int Count
{
get { return Filter().Count(); }
}
public bool IsReadOnly
{
get { return _super.IsReadOnly; }
}
public bool ContainsKey(TKey key)
{
return _keyFilter(key) && _super.ContainsKey(key);
}
public void Add(TKey key, TValue value)
{
_super.Add(key, value);
}
public bool Remove(TKey key)
{
return _super.Remove(key);
}
public bool TryGetValue(TKey key, out TValue value)
{
return _super.TryGetValue(key, out value);
}
public TValue this[TKey key]
{
get { return _super[key]; }
set { _super[key] = value; }
}
public ICollection<TKey> Keys
{
get { return _super.Keys.Where(_keyFilter).ToList().AsReadOnly(); }
}
public ICollection<TValue> Values
{
get { return Filter().Select(kvp => kvp.Value).ToList().AsReadOnly(); }
}
public SubDictionary(IDictionary<TKey, TValue> super, Func<TKey,bool> keyFilter)
{
_super = super;
_keyFilter = keyFilter;
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
}