internal static IQueryModifier <TEntity>[] GetModifiers <TEntity>(this QueryModifiers cmod)
{
if (cmod == null)
{
return(null);
}
List <IQueryModifier <TEntity> > modifiers = new List <IQueryModifier <TEntity> >();
if (cmod.Filters != null)
{
modifiers.AddRange(cmod.Filters.Where(f => f != null).Select(f => f.GetModifier <TEntity>()));
}
if (!cmod.Sorting.IsNullOrEmpty())
{
var betterSort = cmod.Sorting.Where(s => s != null).ToList();
modifiers.AddRange(betterSort.Take(1).Select(s => s.GetModifier <TEntity>(isFirst: true)));
modifiers.AddRange(betterSort.Skip(1).Select(s => s.GetModifier <TEntity>(isFirst: false)));
}
if (cmod.Paging != null)
{
modifiers.Add(cmod.Paging.GetModifier <TEntity>());
}
return(modifiers.Count == 0 ? null : modifiers.ToArray());
}
public static long LongCount <TEntity>(this IQueryable <TEntity> query, QueryModifiers queryModifiers)
{
var newQuery = query.Augment(queryModifiers);
long count = newQuery.Count();
return(count);
}
private void LogLinqModifierName(NonEmptyString linqModifier, QueryModifiers queryModifiers)
{
Debug.Assert(!linqModifier.ToString().IsBlank());
this.LogInformationData("LINQ Modifier", linqModifier);
if (queryModifiers != null)
{
this.LogInformationData("Query Modifiers", queryModifiers);
}
}
public IList <TEntity> Page <TEntity>(int pageIndex, int pageSize, Expression <Func <TInstance, IEnumerable <TEntity> > > sequenceExpression)
{
this.LogLinqModifierName("Page<TEntity>(int pageIndex, int pageSize, Expression<Func<TInstance, IEnumerable<TEntity>>> sequenceExpression)", queryModifiers: null);
QueryModifiers mods = new QueryModifiers {
Paging = new QueryModifiers.PagingInfo {
PageIndex = pageIndex, PageSize = pageSize
}
};
this.Invoke(sequenceExpression, sequence => sequence.ToListWithMods(mods));
List <TEntity> entityList = (List <TEntity>) this.ReturnedValue;
return(entityList);
}
/// <summary>
/// Returns false if query modifiers are going to modify the query,
/// and true if no changes to the query will be made.
/// </summary>
/// <param name="queryModifiers"></param>
/// <returns></returns>
public static bool IsEmpty(this QueryModifiers queryModifiers)
{
if (queryModifiers != null)
{
if (!queryModifiers.Filters.IsNullOrEmpty())
{
return(false);
}
if (!queryModifiers.Sorting.IsNullOrEmpty())
{
return(false);
}
if (queryModifiers.Paging != null)
{
return(false);
}
}
return(true);
}
public static long LongCount <TEntity>(this IEnumerable <TEntity> collection, QueryModifiers queryModifiers)
{
var newQuery = collection.Augment(queryModifiers);
long count = newQuery.Count();
return(count);
}
public static List <TEntity> ToListWithMods <TEntity>(this IEnumerable <TEntity> collection, QueryModifiers queryModifiers)
{
var newQuery = collection.Augment(queryModifiers);
// ReSharper disable once SuspiciousTypeConversion.Global
List <TEntity> retVal = newQuery as List <TEntity> ?? newQuery.ToList();
return(retVal);
}
public static IList <TEntity> ToIListWithMods <TEntity>(this IQueryable <TEntity> query, QueryModifiers queryModifiers)
{
var newQuery = query.Augment(queryModifiers);
// ReSharper disable once SuspiciousTypeConversion.Global
IList <TEntity> retVal = newQuery as IList <TEntity> ?? newQuery.ToList();
return(retVal);
}
/// <summary>
/// Applies dynamic modifiers to a collection.
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="collection"></param>
/// <param name="queryModifiers"></param>
/// <returns></returns>
public static IEnumerable <TEntity> Augment <TEntity>(this IEnumerable <TEntity> collection, QueryModifiers queryModifiers)
{
IQueryModifier <TEntity>[] mods = queryModifiers.GetModifiers <TEntity>();
return(collection.AugmentCollection(mods));
}
/// <summary>
/// Applies dynamic modifiers to a query.
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="query"></param>
/// <param name="queryModifiers"></param>
/// <returns></returns>
public static IQueryable <TEntity> Augment <TEntity>(this IQueryable <TEntity> query, QueryModifiers queryModifiers)
{
IQueryModifier <TEntity>[] mods = queryModifiers.GetModifiers <TEntity>();
return(query.AugmentQuery(mods));
}
/// <summary>
/// Adds LongCount() to IQueryable return result.
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="sequenceExpression"></param>
/// <param name="queryModifiers"></param>
/// <returns>Number of items in the collection</returns>
public long Count <TEntity>(Expression <Func <TInstance, IEnumerable <TEntity> > > sequenceExpression, QueryModifiers queryModifiers = null)
{
this.LogLinqModifierName("Count<TEntity>(Expression<Func<TInstance, IEnumerable<TEntity>>> sequenceExpression)", queryModifiers);
this.Invoke(sequenceExpression, collection => LongCountInternal(collection, queryModifiers));
long count = (long)this.ReturnedValue;
return(count);
}
/// <summary>
/// Adds LongCount() to IQueryable return result.
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="linqQueryExpression"></param>
/// <param name="queryModifiers"></param>
/// <returns>Number of records that would be returned by the query</returns>
public long Count <TEntity>(Expression <Func <TInstance, IQueryable <TEntity> > > linqQueryExpression, QueryModifiers queryModifiers = null)
{
this.LogLinqModifierName("Count<TEntity>(Expression<Func<TInstance, IQueryable<TEntity>>> linqQueryExpression)", queryModifiers);
this.Invoke(linqQueryExpression, query => LongCountInternal(query, queryModifiers));
long count = (long)this.ReturnedValue;
return(count);
}
private static object LongCountInternal <TEntity>(IEnumerable <TEntity> collection, QueryModifiers queryModifiers)
{
return(collection.LongCount(queryModifiers));
}
/// <summary>
/// Can't use QueryModifiersExtensions.LongCount()
/// because that returns int, and we need object.
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="query"></param>
/// <param name="queryModifiers"></param>
/// <returns></returns>
private static object LongCountInternal <TEntity>(IQueryable <TEntity> query, QueryModifiers queryModifiers)
{
return(query.LongCount(queryModifiers));
}
/// <summary>
/// Appends ToList() to IEnumerable.
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="sequenceExpression"></param>
/// <param name="queryModifiers">Optional filtering, sorting and paging applied to the query</param>
/// <returns></returns>
public List <TEntity> ListList <TEntity>(Expression <Func <TInstance, IEnumerable <TEntity> > > sequenceExpression, QueryModifiers queryModifiers = null)
{
this.LogLinqModifierName("ListList<TEntity>(Expression<Func<TInstance, IEnumerable<TEntity>>> sequenceExpression)", queryModifiers);
this.Invoke(sequenceExpression, collection => collection.ToListWithMods(queryModifiers));
List <TEntity> entityList = (List <TEntity>) this.ReturnedValue;
return(entityList);
}
/// <summary>
/// Triggers query execution by appending ToList() to IQueryable, and returns List.
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="linqQueryExpression"></param>
/// <param name="queryModifiers">Optional filtering, sorting and paging applied to the query</param>
/// <returns></returns>
public List <TEntity> ListList <TEntity>(Expression <Func <TInstance, IQueryable <TEntity> > > linqQueryExpression, QueryModifiers queryModifiers = null)
{
this.LogLinqModifierName("ListList<TEntity>(Expression<Func<TInstance, IQueryable<TEntity>>> linqQueryExpression)", queryModifiers);
this.Invoke(linqQueryExpression, query => query.ToListWithMods(queryModifiers));
List <TEntity> entityList = (List <TEntity>) this.ReturnedValue;
return(entityList);
}
