static T Find <T>(ExpressionBuilder builder, BuildInfo buildInfo, Func <int, IBuildContext, T> action)
{
var expression = buildInfo.Expression;
switch (expression.NodeType)
{
case ExpressionType.Constant:
{
var c = (ConstantExpression)expression;
if (c.Value is IQueryable)
{
return(action(1, null));
}
break;
}
case ExpressionType.Call:
{
var mc = (MethodCallExpression)expression;
if (mc.Method.Name == "GetTable")
{
if (expression.Type.IsGenericType && expression.Type.GetGenericTypeDefinition() == typeof(Table <>))
{
return(action(2, null));
}
}
break;
}
case ExpressionType.MemberAccess:
if (expression.Type.IsGenericType && expression.Type.GetGenericTypeDefinition() == typeof(Table <>))
{
return(action(3, null));
}
// Looking for association.
//
if (buildInfo.IsSubQuery && buildInfo.SqlQuery.From.Tables.Count == 0)
{
var ctx = builder.GetContext(buildInfo.Parent, expression);
if (ctx != null)
{
return(action(4, ctx));
}
}
break;
case ExpressionType.Parameter:
{
if (buildInfo.IsSubQuery && buildInfo.SqlQuery.From.Tables.Count == 0)
{
var ctx = builder.GetContext(buildInfo.Parent, expression);
if (ctx != null)
{
return(action(4, ctx));
}
}
break;
}
}
return(action(0, null));
}