public static IEnumerable <IColumnConfig> GetColumns(this IFragmentContainer container)
{
return(container
.Flatten <IColumnBuilder>()
.Select(expression => expression.Column)
.Distinct());
}
public static IEnumerable <T> Flatten <T>(this IFragmentContainer container) where T : IFragmentBuilder
{
var result = new HashSet <T>();
var stack = new Stack <IFragmentContainer>();
stack.Push(container);
while (stack.Count > 0)
{
container = stack.Pop();
if (container is T)
{
result.Add((T)container);
}
foreach (var expression in container.Expressions)
{
if (expression is T)
{
result.Add((T)expression);
}
if (expression is IFragmentContainer)
{
stack.Push((IFragmentContainer)expression);
}
}
}
return(result);
}
public static TResult GetOppositeExpression <T, TResult>(this IFragmentContainer container, Predicate <T> predicate) where T : IFragmentBuilder
{
var expressions = container.Flatten <IBinaryExpressionBuilder>();
foreach (var binary in expressions)
{
if (binary.Left is T && predicate((T)binary.Left) && binary.Right is TResult)
{
return((TResult)binary.Right);
}
if (binary.Right is T && predicate((T)binary.Right) && binary.Left is TResult)
{
return((TResult)binary.Left);
}
}
return(default(TResult));
}
public TaskAwaiter(IFragmentContainer fragmentContainer)
{
_container = fragmentContainer;
}
public static IEnumerable <IExpressionBuilder> GetExpressions(IFragmentContainer container)
{
return(container.GetExpressions <IFunctionBuilder>(function => function.Function == QueryFunction.Exists));
}
public static IEnumerable <T> GetExpressions <T>(this IFragmentContainer container, Func <T, bool> predicate) where T : IFragmentBuilder
{
return(container.Expressions.OfType <T>().Where(predicate));
}
public static T GetExpression <T>(this IFragmentContainer container, Func <T, bool> predicate) where T : IFragmentBuilder
{
return(container.Expressions.OfType <T>().FirstOrDefault(predicate));
}
public static T GetExpression <T>(this IFragmentContainer container) where T : IFragmentBuilder
{
return(container.Expressions.OfType <T>().FirstOrDefault());
}
public static IDictionary <ITableConfig, IList <IColumnConfig> > GetColumnMap(this IFragmentContainer container)
{
return(container
.Flatten <IColumnBuilder>()
.GroupBy(expression => expression.Column.Table)
.ToDictionary(group => group.Key, group => (IList <IColumnConfig>)group.Select(expression => expression.Column).ToList()));
}
