public SelectorExpression(string identifier, Type type)
{
if (identifier == null) throw new ArgumentNullException("identifier");
_identifier = identifier;
_selectorType = CqlExpressionType.IdentifierSelector;
_type = type;
}
public SelectClauseExpression(IEnumerable<SelectorExpression> selectors, bool distinct)
{
_nodeType = CqlExpressionType.SelectColumns;
_distinct = distinct;
_selectors = selectors.AsReadOnly();
for (int i = 0; i < _selectors.Count; i++)
_selectors[i].Ordinal = i;
}
public TermExpression(ISet<TermExpression> terms)
{
if (terms == null || terms.Count == 0)
throw new CqlLinqException("Empty lists are not allowed");
_type = typeof(ISet<>).MakeGenericType(terms.First().Type);
_terms = terms.ToList().AsReadOnly();
_termType = CqlExpressionType.Set;
}
public SelectorExpression(MethodInfo function, IEnumerable<SelectorExpression> arguments)
{
if (function.DeclaringType != typeof (CqlFunctions))
throw new ArgumentException("function must be a valid Cql Function");
_function = function;
_arguments = arguments.AsReadOnly();
_type = function.ReturnType;
_selectorType = CqlExpressionType.FunctionSelector;
}
public OrderingExpression(SelectorExpression selector, CqlExpressionType orderType)
{
if (selector == null)
throw new ArgumentNullException("selector");
if (orderType != CqlExpressionType.OrderAscending && orderType != CqlExpressionType.OrderDescending)
throw new ArgumentException("ExpressionType must be OrderAscending or OrderDescending", "orderType");
_selector = selector;
_order = orderType;
}
/// <summary>
/// Initializes a new instance of the <see cref="RelationExpression" /> class.
/// </summary>
/// <param name="selector"> The selector. </param>
/// <param name="relation"> The relation. </param>
/// <param name="term"> The term. </param>
/// <exception cref="System.ArgumentNullException">selector
/// or
/// term</exception>
public RelationExpression(SelectorExpression selector, CqlExpressionType relation, TermExpression term)
{
if (selector == null) throw new ArgumentNullException("selector");
if (term == null)
throw new ArgumentNullException("term");
_selector = selector;
_relation = relation;
_term = term;
}
public TermExpression(Object value)
{
if (value == null) throw new ArgumentNullException("value");
////check if type is a supported CQL type
// if (!value.GetType().IsSupportedCqlType())
// throw new CqlLinqException(string.Format("Type {0} can't be coverted to a CQL value", value.GetType()));
_type = value.GetType();
_termType = CqlExpressionType.Constant;
_value = value;
}
public SelectClauseExpression(bool count)
{
_nodeType = count ? CqlExpressionType.SelectCount : CqlExpressionType.SelectAll;
}
public TermExpression(MethodInfo function, IEnumerable<TermExpression> arguments)
{
if (arguments == null)
throw new ArgumentNullException("arguments");
_function = function;
_terms = arguments.AsReadOnly();
_termType = CqlExpressionType.Function;
_type = function.ReturnType;
}
public TermExpression(IDictionary<TermExpression, TermExpression> terms)
{
if (terms == null || terms.Count == 0)
throw new CqlLinqException("Empty dictionaries are not allowed");
var firstElement = terms.First();
_type = typeof(IDictionary<,>).MakeGenericType(firstElement.Key.Type, firstElement.Value.Type);
_dictionaryTerms = terms.AsReadOnly();
_termType = CqlExpressionType.Map;
}
public TermExpression(Type parameterType, int order)
{
_order = order;
_type = parameterType;
_termType = CqlExpressionType.Variable;
}
private TermExpression(TermExpression original, IEnumerable<TermExpression> terms,
IDictionary<TermExpression, TermExpression> dictTerms)
{
_function = original.Function;
_termType = original._termType;
_type = original.Type;
_value = original.Value;
_terms = terms.AsReadOnly();
_dictionaryTerms = dictTerms.AsReadOnly();
}
/// <summary>
/// Shuffles identifier and term expression in the right order
/// </summary>
/// <param name="left"> The left. </param>
/// <param name="right"> The right. </param>
/// <param name="compareOp"> The compare operation. </param>
/// <param name="compareOpSwitched"> The compare operation switched. </param>
/// <returns> true expression if the relation is succesfully created </returns>
/// <exception cref="CqlLinqException">Can't determine the (column) identfier for the CQL where relation
/// or
/// Error creating relation. Not able to detect the correct term to create the relation with.</exception>
private Expression CreateRelation(Expression left, Expression right, CqlExpressionType compareOp,
CqlExpressionType compareOpSwitched)
{
bool shuffled = false;
if (left.GetType() != typeof(SelectorExpression))
{
if (right.GetType() != typeof(SelectorExpression))
throw new CqlLinqException("Can't determine the column/token selector for the CQL where relation");
//swap expressions
Expression temp = left;
left = right;
right = temp;
shuffled = true;
}
if (right.GetType() != typeof(TermExpression))
throw new CqlLinqException("Could not detect term in the CQL where relation");
_relations.Add(new RelationExpression((SelectorExpression)left, shuffled ? compareOpSwitched : compareOp,
(TermExpression)right));
return Expression.Constant(true);
}
