public override IQueryable <TEntity> Output(QueryWalkInfo <TEntity> walkInfo)
{
var query = ApplySearch(walkInfo);
query = ApplyWhere(query, walkInfo);
query = ApplyOrder(query, walkInfo);
query = ApplySelect(query, walkInfo);
return(query);
}
private IQueryable <TEntity> ApplyWhere(IQueryable <TEntity> query, QueryWalkInfo <TEntity> walkInfo)
{
var expression = BuildFilterExpression(walkInfo);
if (expression != null)
{
query = query.Where((Expression <Func <TEntity, bool> >)expression);
}
return(query);
}
private IQueryable <TEntity> ApplyOrder(IQueryable <TEntity> query, QueryWalkInfo <TEntity> walkInfo)
{
var querySortList = GetSorts(walkInfo);
var type = typeof(TEntity);
for (int i = 0; i <= querySortList.Length - 1; i++)
{
var property = type.GetPropertyIgnoreCase(querySortList[i].Field);
query = GetOrderMethod(i == 0, querySortList[i], typeof(Queryable),
new Type[] { typeof(IQueryable <>), typeof(Expression <>) },
new Type[] { typeof(IOrderedQueryable <>), typeof(Expression <>) },
new Type[] { type, property.PropertyType }).Invoke(query, new object[]
{
query,
GetOrderParameter(type, property)
}) as IQueryable <TEntity>;
}
return(query);
}
private IQueryable <TEntity> ApplySearch(QueryWalkInfo <TEntity> walkInfo)
{
if (string.IsNullOrWhiteSpace(walkInfo.QueryParams.Search))
{
return(walkInfo.Query);
}
var searchKeyProperties = _propertyProvider.GetProperties(typeof(TEntity)).Where(p => p.GetCustomAttribute <SearchKeyAttribute>() != null);
if (searchKeyProperties.Where(p => p.PropertyType != typeof(string)).Any())
{
throw new InvalidOperationException("CoreApiDirect.Entities.SearchKeyAttribute is added to a non string property.");
}
if (!searchKeyProperties.Any())
{
return(walkInfo.Query);
}
var type = typeof(TEntity);
var parameter = Expression.Parameter(type, type.Name.Camelize());
Expression expressionOr = null;
foreach (var searchKeyProperty in searchKeyProperties)
{
Expression property = Expression.Property(parameter, searchKeyProperty.Name);
var value = Expression.Constant(walkInfo.CaseSensitiveSearch ? walkInfo.QueryParams.Search : walkInfo.QueryParams.Search.ToLower());
if (!walkInfo.CaseSensitiveSearch)
{
property = Expression.Call(property, typeof(string).GetMethod("ToLower", new Type[] { }));
}
var containsMethod = typeof(string).GetMethod("Contains", new Type[] { typeof(string) });
var expression = Expression.Equal(Expression.Call(property, containsMethod, value), Expression.Constant(true));
expressionOr = expressionOr == null ? expression : Expression.OrElse(expressionOr, expression);
}
return(walkInfo.Query.Where(Expression.Lambda <Func <TEntity, bool> >(expressionOr, parameter)));
}
protected override Type GetWalkInfoTypeForProperty(QueryWalkInfo <TEntity> walkInfo)
{
return(typeof(QueryWalkInfo <>).MakeGenericType(walkInfo.Type));
}
protected override string GetSortFieldPrefix(QueryWalkInfo <TEntity> walkInfo)
{
return("");
}
protected override string GetNextFieldMemberChain(PropertyInfo property, QueryWalkInfo <TEntity> walkInfo)
{
return(property.Name);
}
private IQueryable <TEntity> ApplySelect(IQueryable <TEntity> query, QueryWalkInfo <TEntity> walkInfo)
{
return(query.Select(Expression.Lambda <Func <TEntity, TEntity> >(BuildMemberInitExpression(), walkInfo.Member as ParameterExpression)));
}
