private Expression FillUpdateProjection(MemberExpression node)
{
PocoColumn column;
if (node.Expression == null || node.Expression.NodeType != ExpressionType.Parameter)
{
column = _pocoData.GetColumnByMemberName(_currentBindingName.Get());
if (column == null)
{
throw new InvalidOperationException("No mapping defined for member: " + node.Member.Name);
}
if (column.IsCounter)
{
var value = CqlExpressionVisitor.GetClosureValue(node);
if (!(value is long || value is int))
{
throw new ArgumentException("Only Int64 and Int32 values are supported as counter increment of decrement values");
}
_projections.Add(Tuple.Create(column, value, ExpressionType.Increment));
return(node);
}
AddProjection(node, column);
return(node);
}
column = _pocoData.GetColumnByMemberName(node.Member.Name);
if (column == null)
{
throw new InvalidOperationException("No mapping defined for member: " + node.Member.Name);
}
_projections.Add(Tuple.Create(column, (object)column.ColumnName, ExpressionType.Assign));
return(node);
}
private Expression FillCondition(MemberExpression node)
{
var condition = _conditions.Last();
if (node.Expression == null || node.Expression.NodeType == ExpressionType.MemberAccess)
{
var val = CqlExpressionVisitor.GetClosureValue(node);
condition.SetParameter(val);
return(node);
}
if (node.Expression.NodeType == ExpressionType.Parameter)
{
var column = _pocoData.GetColumnByMemberName(node.Member.Name);
if (column == null)
{
throw new InvalidOperationException($"No mapping defined for member: {node.Member.Name}");
}
condition.SetColumn(column);
if (column.ColumnType == typeof(bool))
{
condition.SetOperator(ExpressionType.Equal);
// We are evaluating a boolean expression parameter, the value we are trying to match is true
condition.SetParameter(true);
}
return(node);
}
if (node.Expression.NodeType == ExpressionType.Constant)
{
var val = CqlExpressionVisitor.GetClosureValue(node);
if (val is CqlToken)
{
var tokenValues = (val as CqlToken).Values;
condition.SetFunctionName("token").AllowMultipleParameters();
foreach (var pk in tokenValues)
{
condition.SetParameter(pk);
}
}
else
{
condition.SetParameter(val);
}
return(node);
}
return(node);
}
private static object GetFieldValue(MemberExpression node)
{
var fieldInfo = (FieldInfo)node.Member;
if (node.Expression is MemberExpression)
{
// The field of a field instance
var instance = CqlExpressionVisitor.GetClosureValue((MemberExpression)node.Expression);
return(fieldInfo.GetValue(instance));
}
if (node.Expression == null)
{
// Static field
return(fieldInfo.GetValue(null));
}
return(fieldInfo.GetValue(((ConstantExpression)node.Expression).Value));
}
private static object GetPropertyValue(MemberExpression node)
{
var propertyInfo = (PropertyInfo)node.Member;
if (node.Expression == null)
{
return(propertyInfo.GetValue(null));
}
if (node.Expression is MemberExpression)
{
// Field property
var instance = CqlExpressionVisitor.GetClosureValue((MemberExpression)node.Expression);
return(propertyInfo.GetValue(instance, null));
}
// Current instance property
return(propertyInfo.GetValue(((ConstantExpression)node.Expression).Value, null));
}
/// <summary>
/// Tries to evaluate the current expression and add it as a projection
/// </summary>
private Expression AddProjection(Expression node, PocoColumn column = null)
{
object value;
if (node is MemberExpression)
{
value = CqlExpressionVisitor.GetClosureValue((MemberExpression)node);
}
else
{
value = Expression.Lambda(node).Compile().DynamicInvoke();
}
if (column == null)
{
column = _pocoData.GetColumnByMemberName(_currentBindingName.Get());
if (column == null)
{
throw new CqlLinqNotSupportedException(node, _parsePhase.Get());
}
}
_projections.Add(Tuple.Create(column, value, ExpressionType.Assign));
return(node);
}
