private static Cassandra.IndexExpression VisitRelationalExpression(BinaryExpression exp)
{
Cassandra.IndexExpression indexExpression;
var columnName = GetColumnName(exp.Left);
var value = CassandraObject.GetCassandraObjectFromObject(Expression.Lambda(exp.Right).Compile().DynamicInvoke(), CassandraType.BytesType);
indexExpression = new Cassandra.IndexExpression {
Column_name = columnName.ToBigEndian(),
Value = value.ToBigEndian()
};
switch (exp.NodeType)
{
case ExpressionType.Equal: indexExpression.Op = Cassandra.IndexOperator.EQ; break;
case ExpressionType.GreaterThan: indexExpression.Op = Cassandra.IndexOperator.GT; break;
case ExpressionType.GreaterThanOrEqual: indexExpression.Op = Cassandra.IndexOperator.GTE; break;
case ExpressionType.LessThan: indexExpression.Op = Cassandra.IndexOperator.LT; break;
case ExpressionType.LessThanOrEqual: indexExpression.Op = Cassandra.IndexOperator.LTE; break;
default:
throw new NotSupportedException(exp.NodeType.ToString() + " is not a supported relational criteria.");
}
return(indexExpression);
}
public static CassandraSlicePredicate SetSchemaForSlicePredicate(CassandraSlicePredicate predicate, CassandraColumnFamilySchema schema, bool forSuperColumn = false)
{
CassandraType columnType = forSuperColumn ? schema.SuperColumnNameType : schema.ColumnNameType;
if (predicate is CassandraRangeSlicePredicate)
{
var x = (CassandraRangeSlicePredicate)predicate;
var start = CassandraObject.GetCassandraObjectFromObject(x.Start, columnType);
var finish = CassandraObject.GetCassandraObjectFromObject(x.Finish, columnType);
return(new CassandraRangeSlicePredicate(start, finish, x.Reversed, x.Count));
}
else if (predicate is CassandraColumnSlicePredicate)
{
var x = (CassandraColumnSlicePredicate)predicate;
var cols = x.Columns.ToList();
for (int i = 0; i < cols.Count; i++)
{
cols[i] = CassandraObject.GetCassandraObjectFromObject(cols[i], columnType);
}
return(new CassandraColumnSlicePredicate(cols));
}
return(null);
}