public static ConstructedValueExpression GetCollectionPopulateStatements(ICompiler scalars, ICompiler nonScalars, MapTypeContext context, Type elementType, Expression listVar, MethodInfo addMethod)
{
if (!context.HasColumns())
{
return(new ConstructedValueExpression(null));
}
var expressions = new List <Expression>();
var variables = new List <ParameterExpression>();
// For scalar types (object is treated like a scalar here), map each column to an entry in the
// array, consuming all remaining columns.
if (elementType.IsSupportedPrimitiveType() || elementType == typeof(object))
{
var columns = context.GetColumns();
foreach (var column in columns)
{
var columnState = context.GetSubstateForColumn(column, elementType, null);
var result = scalars.Compile(columnState);
expressions.AddRange(result.Expressions);
expressions.Add(
Expression.Call(
listVar,
addMethod,
result.FinalValue
)
);
variables.AddRange(result.Variables);
}
return(new ConstructedValueExpression(expressions, null, variables));
}
// For all non-scalar types
// loop so long as we have columns and consume columns every iteration.
var elementState = context.ChangeTargetType(elementType);
var numberOfColumns = context.NumberOfColumns();
while (numberOfColumns > 0)
{
var result = nonScalars.Compile(elementState);
var newNumberOfColumns = context.NumberOfColumns();
// We haven't consumed any new columns, so we're done.
if (newNumberOfColumns == numberOfColumns)
{
break;
}
expressions.AddRange(result.Expressions);
expressions.Add(
Expression.Call(listVar, addMethod, result.FinalValue)
);
variables.AddRange(result.Variables);
numberOfColumns = newNumberOfColumns;
}
return(new ConstructedValueExpression(expressions, null, variables));
}
