protected virtual void VisitCastToken(CastToken token)
{
State.Write(Symbols.CAST);
State.Write(Symbols.OpenParenthesis);
VisitToken(token.Token);
State.Write(Symbols.AS);
VisitType(token);
State.Write(Symbols.CloseParenthesis);
}
/// <summary>
/// Binds a type segment token.
/// </summary>
/// <param name="castToken">The type segment token to bind.</param>
/// <returns>The bound type segment token.</returns>
protected virtual QueryNode BindCast(CastToken castToken)
{
ExceptionUtils.CheckArgumentNotNull(castToken, "typeSegmentToken");
var childType = this.model.FindType(castToken.SegmentSpace + "." + castToken.SegmentName);
// Check whether childType is a derived type of the type of its parent node
QueryNode parent;
IEdmType parentType;
if (castToken.Source == null)
{
parent = null;
parentType = this.parameter.ParameterType.Definition;
}
else
{
parent = this.Bind(castToken.Source);
parentType = GetType(parent);
}
if (!childType.IsOrInheritsFrom(parentType))
{
throw new ODataException(Strings.MetadataBinder_HierarchyNotFollowed(childType.FullName(), parentType.ODataFullName()));
}
return new CastNode()
{
EdmType = childType,
Source = (SingleValueQueryNode)parent
};
}
protected override void VisitCastToken(CastToken token)
{
State.Write(Symbols.CAST, Symbols.OpenParenthesis);
VisitToken(token.Token);
State.Write(Symbols.AS);
// cast supports only these data types:
// BINARY[(N)]
// CHAR[(N)][charset_info]
// DATE
// DATETIME
// DECIMAL[(M[, D])]
// NCHAR[(N)]
// SIGNED[INTEGER]
// TIME
// UNSIGNED[INTEGER]
CommonDbType?targetType;
switch (token.DbType)
{
case CommonDbType.Bit:
case CommonDbType.BigInt:
case CommonDbType.SmallInt:
case CommonDbType.TinyInt:
targetType = CommonDbType.Int;
break;
case CommonDbType.Float:
case CommonDbType.Money:
case CommonDbType.Real:
case CommonDbType.SmallMoney:
targetType = CommonDbType.Decimal;
break;
case CommonDbType.NText:
case CommonDbType.NVarChar:
case CommonDbType.Xml:
targetType = CommonDbType.NChar;
break;
case CommonDbType.UniqueIdentifier:
case CommonDbType.Text:
case CommonDbType.VarChar:
targetType = CommonDbType.Char;
break;
case CommonDbType.SmallDateTime:
case CommonDbType.Timestamp:
case CommonDbType.Date:
case CommonDbType.DateTime2:
case CommonDbType.DateTimeOffset:
targetType = CommonDbType.DateTime;
break;
case CommonDbType.VarBinary:
case CommonDbType.Image:
case CommonDbType.Variant:
targetType = CommonDbType.Binary;
break;
default:
throw new ArgumentOutOfRangeException();
}
if (targetType != token.DbType)
{
var clonedToken = new CastToken
{
Alias = token.Alias,
DbType = targetType,
Length = token.Length,
Precision = token.Precision,
Scale = token.Scale,
Token = token.Token,
};
foreach (var parameter in token.Parameters)
{
clonedToken.Parameters.Add(parameter);
}
foreach (var parameterValue in token.ParameterValues)
{
clonedToken.ParameterValues.Add(parameterValue);
}
VisitType(clonedToken);
}
else
{
VisitType(token);
}
State.Write(Symbols.CloseParenthesis);
}