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using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
namespace Org.BouncyCastle.Utilities.Collections
{
public abstract class CollectionUtilities
{
public static void AddRange(IList to, IEnumerable range)
{
foreach (object o in range)
{
to.Add(o);
}
}
public static void CollectMatches<T>(ICollection<T> matches, ISelector<T> selector, params IStore<T>[] stores)
{
CollectMatches(matches, selector, stores);
}
public static void CollectMatches<T>(ICollection<T> matches, ISelector<T> selector,
IEnumerable<IStore<T>> stores)
{
if (matches == null)
throw new ArgumentNullException(nameof(matches));
if (stores == null)
return;
foreach (var store in stores)
{
if (store == null)
continue;
foreach (T match in store.EnumerateMatches(selector))
{
matches.Add(match);
}
}
}
public static IStore<T> CreateStore<T>(IEnumerable<T> contents)
{
return new StoreImpl<T>(contents);
}
public static V GetValueOrNull<K, V>(IDictionary<K, V> d, K k)
where V : class
{
return d.TryGetValue(k, out var v) ? v : null;
}
public static IEnumerable<T> Proxy<T>(IEnumerable<T> e)
{
return new EnumerableProxy<T>(e);
}
public static IDictionary ReadOnly(IDictionary d)
{
return new UnmodifiableDictionaryProxy(d);
}
public static IList ReadOnly(IList l)
{
return new UnmodifiableListProxy(l);
}
public static ISet ReadOnly(ISet s)
{
return new UnmodifiableSetProxy(s);
}
public static bool Remove<K, V>(IDictionary<K, V> d, K k, out V v)
{
if (!d.TryGetValue(k, out v))
return false;
d.Remove(k);
return true;
}
public static object RequireNext(IEnumerator e)
{
if (!e.MoveNext())
throw new InvalidOperationException();
return e.Current;
}
public static string ToString<T>(IEnumerable<T> c)
{
IEnumerator<T> e = c.GetEnumerator();
if (!e.MoveNext())
return "[]";
StringBuilder sb = new StringBuilder("[");
sb.Append(e.Current);
while (e.MoveNext())
{
sb.Append(", ");
sb.Append(e.Current);
}
sb.Append(']');
return sb.ToString();
}
}
}
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