private void Compile()
{
if (_query == null)
{
_query = SnExpression.BuildQuery(_queryable.Expression, typeof(T), _queryable.ContextPath, _queryable.ChildrenDefinition);
}
}
private void Compile()
{
if (_query == null)
{
var query = SnExpression.BuildQuery(_queryable.Expression, typeof(T), _queryable.ContextPath, _queryable.ChildrenDefinition);
query.AddAndClause(SnExpression.GetPathPredicate(_queryable.ContextPath, _queryable.SubTree));
_query = query;
}
}
// ==================================================================================================================================================
public SnQuery GetCompiledQuery()
{
var q = SnExpression.BuildQuery(this.Expression, typeof(T), this.ContextPath, this.ChildrenDefinition);
return(q);
}
public virtual TResult Execute <TResult>(Expression expression)
{
var count = 0;
// in case there is a predefined list of nodes, we do not execute a query (but we still need to build it)
if (!this.ExecuteQuery)
{
count = ChildrenDefinition.BaseCollection.Count();
}
var query = SnExpression.BuildQuery(expression, typeof(T), this.ContextPath, this.ChildrenDefinition, out var elementSelection);
if (TracingEnabled)
{
TraceLog.Append("Expression: ").AppendLine(expression.ToString());
TraceLog.Append("Query: ").AppendLine(query.ToString());
TraceLog.AppendLine("--------------");
}
var result = this.ExecuteQuery ? query.Execute(SnQueryContext.CreateDefault()) : null;
if (query.CountOnly)
{
if (this.ExecuteQuery)
{
count = result.TotalCount;
}
if (query.ExistenceOnly)
{
return((TResult)Convert.ChangeType(count > 0, typeof(TResult)));
}
return((TResult)Convert.ChangeType(count, typeof(TResult)));
}
if (this.ExecuteQuery)
{
count = result.TotalCount;
}
if (count == 0)
{
if (query.ThrowIfEmpty)
{
if (elementSelection == "elementat")
{
// ReSharper disable once NotResolvedInText
throw new ArgumentOutOfRangeException("Index was out of range.");
}
else
{
throw new InvalidOperationException("Sequence contains no elements.");
}
}
return(default(TResult));
}
if (typeof(Node).IsAssignableFrom(typeof(TResult)))
{
if (ExecuteQuery)
{
return((TResult)Convert.ChangeType(Node.LoadNode(result.Hits.First()), typeof(TResult)));
}
return((TResult)Convert.ChangeType(ChildrenDefinition.BaseCollection.First(), typeof(TResult)));
}
switch (elementSelection)
{
case "first":
return(ExecuteQuery
? (TResult)Convert.ChangeType(Content.Load(result.Hits.FirstOrDefault()), typeof(TResult))
: (TResult)Convert.ChangeType(Content.Create(ChildrenDefinition.BaseCollection.FirstOrDefault()), typeof(TResult)));
case "last":
return(ExecuteQuery
? (TResult)Convert.ChangeType(Content.Load(result.Hits.LastOrDefault()), typeof(TResult))
: (TResult)Convert.ChangeType(Content.Create(ChildrenDefinition.BaseCollection.LastOrDefault()), typeof(TResult)));
case "single":
return(ExecuteQuery
? (TResult)Convert.ChangeType(Content.Load(result.Hits.SingleOrDefault()), typeof(TResult))
: (TResult)Convert.ChangeType(Content.Create(ChildrenDefinition.BaseCollection.SingleOrDefault()), typeof(TResult)));
case "elementat":
var any = ExecuteQuery ? result.Hits.Any() : ChildrenDefinition.BaseCollection.Any();
if (!any)
{
if (query.ThrowIfEmpty)
{
// ReSharper disable once NotResolvedInText
throw new ArgumentOutOfRangeException("Index was out of range.");
}
else
{
return(default(TResult));
}
}
return(ExecuteQuery
? (TResult)Convert.ChangeType(Content.Load(result.Hits.FirstOrDefault()), typeof(TResult))
: (TResult)Convert.ChangeType(Content.Create(ChildrenDefinition.BaseCollection.FirstOrDefault()), typeof(TResult)));
default:
throw new SnNotSupportedException();
}
}
internal static SnQuery GetSnQuery(Expression expr, bool autoFiltersEnabled, bool lifespanEnabled, ChildrenDefinition childrenDef, string contextPath)
{
return(SnExpression.BuildQuery(expr, typeof(T), contextPath, childrenDef));
}
public virtual TResult Execute <TResult>(System.Linq.Expressions.Expression expression)
{
int count = 0;
// in case there is a predefined list of nodes, we do not execute a query (but we still need to build it)
if (!this.ExecuteQuery)
{
count = ChildrenDefinition.BaseCollection.Count();
}
var query = SnExpression.BuildQuery(expression, typeof(T), this.ContextPath, this.ChildrenDefinition);
if (TracingEnabled)
{
TraceLog.Append("Expression: ").AppendLine(expression.ToString());
TraceLog.Append("Query: ").AppendLine(query.ToString());
TraceLog.AppendLine("--------------");
}
var result = this.ExecuteQuery ? query.Execute() : null;
if (query.CountOnly)
{
if (this.ExecuteQuery)
{
count = query.TotalCount;
}
if (query.ExistenceOnly)
{
return((TResult)Convert.ChangeType(count > 0, typeof(TResult)));
}
else
{
return((TResult)Convert.ChangeType(count, typeof(TResult)));
}
}
if (this.ExecuteQuery)
{
count = result.Count();
}
if (count == 0)
{
if (query.ThrowIfEmpty)
{
throw new InvalidOperationException("Sequence contains no elements.");
}
return(default(TResult));
}
if (count == 1)
{
if (typeof(Node).IsAssignableFrom(typeof(TResult)))
{
if (this.ExecuteQuery)
{
return((TResult)Convert.ChangeType(Node.LoadNode(result.First().NodeId), typeof(TResult)));
}
return((TResult)Convert.ChangeType(ChildrenDefinition.BaseCollection.First(), typeof(TResult)));
}
if (this.ExecuteQuery)
{
return((TResult)Convert.ChangeType(Content.Load(result.First().NodeId), typeof(TResult)));
}
return((TResult)Convert.ChangeType(Content.Create(ChildrenDefinition.BaseCollection.First()), typeof(TResult)));
}
throw new NotImplementedException("SnLinq: ContentSet.Execute<TResult>");
}
