You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Lidarr/src/NzbDrone.Core/Datastore/TableMapper.cs

163 lines
5.3 KiB

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
namespace NzbDrone.Core.Datastore
{
public class TableMapper
{
private readonly HashSet<string> _allowedOrderBy = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
public TableMapper()
{
IgnoreList = new Dictionary<Type, List<PropertyInfo>>();
LazyLoadList = new Dictionary<Type, List<LazyLoadedProperty>>();
TableMap = new Dictionary<Type, string>();
}
public Dictionary<Type, List<PropertyInfo>> IgnoreList { get; set; }
public Dictionary<Type, List<LazyLoadedProperty>> LazyLoadList { get; set; }
public Dictionary<Type, string> TableMap { get; set; }
public ColumnMapper<TEntity> Entity<TEntity>(string tableName)
where TEntity : ModelBase
{
var type = typeof(TEntity);
TableMap.Add(type, tableName);
if (IgnoreList.TryGetValue(type, out var list))
{
return new ColumnMapper<TEntity>(list, LazyLoadList[type], _allowedOrderBy);
}
IgnoreList[type] = new List<PropertyInfo>();
LazyLoadList[type] = new List<LazyLoadedProperty>();
return new ColumnMapper<TEntity>(IgnoreList[type], LazyLoadList[type], _allowedOrderBy);
}
public List<PropertyInfo> ExcludeProperties(Type x)
{
return IgnoreList.ContainsKey(x) ? IgnoreList[x] : new List<PropertyInfo>();
}
public string TableNameMapping(Type x)
{
return TableMap.ContainsKey(x) ? TableMap[x] : null;
}
public string SelectTemplate(Type x)
{
return $"SELECT /**select**/ FROM {TableMap[x]} /**join**/ /**innerjoin**/ /**leftjoin**/ /**where**/ /**groupby**/ /**having**/ /**orderby**/";
}
public string DeleteTemplate(Type x)
{
return $"DELETE FROM {TableMap[x]} /**where**/";
}
public string PageCountTemplate(Type x)
{
return $"SELECT /**select**/ FROM {TableMap[x]} /**join**/ /**innerjoin**/ /**leftjoin**/ /**where**/";
}
public bool IsValidSortKey(string sortKey)
{
string table = null;
if (sortKey.Contains('.'))
{
var split = sortKey.Split('.');
if (split.Length != 2)
{
return false;
}
table = split[0];
sortKey = split[1];
}
if (table != null && !TableMap.Values.Contains(table, StringComparer.OrdinalIgnoreCase))
{
return false;
}
if (!_allowedOrderBy.Contains(sortKey))
{
return false;
}
return true;
}
}
public class LazyLoadedProperty
{
public PropertyInfo Property { get; set; }
public ILazyLoaded LazyLoad { get; set; }
}
public class ColumnMapper<T>
where T : ModelBase
{
private readonly List<PropertyInfo> _ignoreList;
private readonly List<LazyLoadedProperty> _lazyLoadList;
private readonly HashSet<string> _allowedOrderBy;
public ColumnMapper(List<PropertyInfo> ignoreList, List<LazyLoadedProperty> lazyLoadList, HashSet<string> allowedOrderBy)
{
_ignoreList = ignoreList;
_lazyLoadList = lazyLoadList;
_allowedOrderBy = allowedOrderBy;
}
public ColumnMapper<T> AutoMapPropertiesWhere(Func<PropertyInfo, bool> predicate)
{
var properties = typeof(T).GetProperties();
_ignoreList.AddRange(properties.Where(x => !predicate(x)));
_allowedOrderBy.UnionWith(properties.Where(x => predicate(x)).Select(x => x.Name));
return this;
}
public ColumnMapper<T> RegisterModel()
{
return AutoMapPropertiesWhere(x => x.IsMappableProperty());
}
public ColumnMapper<T> Ignore(Expression<Func<T, object>> property)
{
_ignoreList.Add(property.GetMemberName());
return this;
}
public ColumnMapper<T> LazyLoad<TChild>(Expression<Func<T, LazyLoaded<TChild>>> property, Func<IDatabase, T, TChild> query, Func<T, bool> condition)
{
var lazyLoad = new LazyLoaded<T, TChild>(query, condition);
var item = new LazyLoadedProperty
{
Property = property.GetMemberName(),
LazyLoad = lazyLoad
};
_lazyLoadList.Add(item);
return this;
}
public ColumnMapper<T> HasOne<TChild>(Expression<Func<T, LazyLoaded<TChild>>> portalExpression, Func<T, int> childIdSelector)
where TChild : ModelBase
{
return LazyLoad(portalExpression,
(db, parent) =>
{
var id = childIdSelector(parent);
return db.Query<TChild>(new SqlBuilder().Where<TChild>(x => x.Id == id)).SingleOrDefault();
},
parent => childIdSelector(parent) > 0);
}
}
}