public static Func <FastDictionary <TKey, TValue> > CreateFastDictionaryGenerator <TKey, TValue>(
this IEqualityComparerExpression <TKey> comparerExp, int capacity, Func <TKey, TKey, bool> equalsFunc, Func <TKey, int> getHashCodeFunc, QueryContainer container)
{
if (EqualityComparerExpression <TKey> .IsSimpleDefault(comparerExp))
{
return(() => new FastDictionary <TKey, TValue>());
}
if (container == null)
{
return(() => new FastDictionary <TKey, TValue>(capacity, equalsFunc, getHashCodeFunc));
}
var equalsExp = comparerExp.GetEqualsExpr();
var getHashCodeExp = comparerExp.GetGetHashCodeExpr();
var vars = VariableFinder.Find(equalsExp).Select(o => o.GetHashCode()).ToList();
if (!vars.Any())
{
vars.Add(string.Empty.StableHash());
}
var hashvars = VariableFinder.Find(getHashCodeExp).Select(o => o.GetHashCode()).ToList();
if (!hashvars.Any())
{
hashvars.Add(string.Empty.StableHash());
}
var key =
Tuple.Create(
equalsExp.ToString() + getHashCodeExp.ToString() + string.Concat(vars.Aggregate((a, i) => a ^ i)) + string.Concat(hashvars.Aggregate((a, i) => a ^ i)),
typeof(TKey), typeof(TValue));
Type temp;
lock (sentinel)
{
if (!generatorCache.TryGetValue(key, out temp))
{
string typeName = Prefix + classCounter++;
var builderCode = new GeneratedFastDictionary(typeName, string.Empty).TransformText();
var a = Transformer.CompileSourceCode(builderCode, Array.Empty <Assembly>(), out string errorMessages);
temp = a.GetType(typeName + "`2");
temp = temp.MakeGenericType(typeof(TKey), typeof(TValue));
MethodInfo init = temp.GetTypeInfo().GetMethod("Initialize", BindingFlags.Static | BindingFlags.Public);
init.Invoke(null, new object[] { equalsFunc, getHashCodeFunc, capacity });
generatorCache.Add(key, temp);
}
if (!container.TryGetFastDictionaryType(key, out Type other))
{
container.RegisterFastDictionaryType(key, temp);
}
}
return(() => (FastDictionary <TKey, TValue>)Activator.CreateInstance(temp));
}