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Readarr/NzbDrone.Core/Datastore/IdService.cs

91 lines
2.6 KiB

using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
namespace NzbDrone.Core.Datastore
{
public class IdService
{
private readonly IndexProvider _indexProvider;
private static readonly ConcurrentDictionary<string, IList<PropertyInfo>> propertyCache = new ConcurrentDictionary<string, IList<PropertyInfo>>();
public IdService(IndexProvider indexProvider)
{
_indexProvider = indexProvider;
}
public void EnsureIds<T>(T obj, HashSet<object> context)
{
//context is use to prevent infinite loop if objects are recursively looped.
if (obj == null || context.Contains(obj))
{
return;
}
context.Add(obj);
var modelBase = obj as BaseRepositoryModel;
if (modelBase != null && modelBase.Id == 0)
{
modelBase.Id = _indexProvider.Next(obj.GetType());
}
var list = obj as IEnumerable;
if (list != null)
{
foreach (var item in list)
{
EnsureIds(item, context);
}
return;
}
foreach (var propertyInfo in GetPotentialProperties(obj.GetType()))
{
var propValue = propertyInfo.GetValue(obj, null);
EnsureIds(propValue, context);
}
}
private IList<PropertyInfo> GetPotentialProperties(Type type)
{
IList<PropertyInfo> result;
if (!propertyCache.TryGetValue(type.FullName, out result))
{
result = type.GetProperties().Where(ShouldCrawl).ToList();
propertyCache.TryAdd(type.FullName, result);
}
return result;
}
private bool ShouldCrawl(PropertyInfo propertyInfo)
{
return propertyInfo.CanRead && ShouldCrawl(propertyInfo.PropertyType);
}
private bool ShouldCrawl(Type type)
{
if (type.IsGenericType)
{
var genericArg = type.GetGenericArguments()[0];
//skip if generic argument type isn't interesting
if (!ShouldCrawl(genericArg))
{
return false;
}
var listType = typeof(IList<>).MakeGenericType(genericArg);
return listType.IsAssignableFrom(type);
}
return type.IsClass && type.FullName.StartsWith("NzbDrone");
}
}
}