public override Expression Visit(DbOfTypeExpression expression)
{
throw new NotImplementedException(
string.Format(
ExceptionMessages.DbExpressionTransformationNotImplemented,
typeof(DbOfTypeExpression).Name));
}
public override DbExpression Visit(DbOfTypeExpression expression)
{
#if DEBUG_VISITS
System.Diagnostics.Debug.Print("Visit(DbOfTypeExpression): OfType={0}", expression.OfType.EdmType.Name);
#endif
// This visitor is called for TPH & TPT entities that need to map from base entity type to the
// actual type. Argument contains the base type expression (i.e. User) and OfType contains the
// derived type (i.e. Student).
// We need to check for any filters that are defined only on the derived type and apply those filters
// here - they will not be detected during the DbScanExpression visitor because those filters will not
// exist on the base type.
// Filters defined on the base type will be found on both entities. So we only want to apply the filter
// that are defined on the OfType entity that are not defined on the Argument entity (as those will be
// applied during the DbScanExpression visitor).
IEnumerable<DynamicFilterDefinition> scanFilterList = null;
var scanExp = expression.Argument as DbScanExpression;
if (scanExp != null)
scanFilterList = FindFiltersForEntitySet(scanExp.Target.ElementType.MetadataProperties);
var ofTypeFilterList = FindFiltersForEntitySet(expression.OfType.EdmType.MetadataProperties);
var filtersToApply = ofTypeFilterList.Where(f => (scanFilterList == null) || !scanFilterList.Any(f2 => f2.ID == f.ID));
var baseResult = base.Visit(expression);
if (filtersToApply.Any())
{
var binding = DbExpressionBuilder.Bind(baseResult);
var newFilterExpression = BuildFilterExpressionWithDynamicFilters(filtersToApply, binding, null);
if (newFilterExpression != null)
{
// If not null, a new DbFilterExpression has been created with our dynamic filters.
return newFilterExpression;
}
}
return baseResult;
}
public override void Visit(DbOfTypeExpression expression)
{
throw new NotSupportedException("Visit(\"OfTypeExpression\") is not supported.");
}
public override object Visit(DbOfTypeExpression expression)
{
this.Visit(expression.Argument);
return(null);
}
public override void Visit(DbOfTypeExpression e)
{
VisitExprKind(e.ExpressionKind);
_key.Append('(');
e.Argument.Accept(this);
_key.Append(":");
_key.Append(e.OfType.EdmType.Identity);
_key.Append(')');
}
public override void Visit(DbOfTypeExpression expression)
{
Contract.Requires(expression != null);
}
public override void Visit(DbOfTypeExpression e)
{
BeginUnary(e);
Dump(e.OfType, "OfType");
End(e);
}
/// <summary>
/// <see cref="VisitUnaryExpression" />
/// </summary>
/// <param name="expression"> The DbOfTypeExpression that is being visited. </param>
/// <returns> </returns>
public override bool Visit(DbOfTypeExpression expression)
{
Check.NotNull(expression, "expression");
return(VisitUnaryExpression(expression));
}
public override DbExpressionEntitySetInfo Visit(DbOfTypeExpression expression)
{
Check.NotNull(expression, "expression");
return(null);
}
public override void Visit(DbOfTypeExpression e)
{
BeginUnary(e);
Dump(e.OfType, "OfType");
End(e);
}
public override LegacyCommandTrees.DbExpression Visit(DbOfTypeExpression expression)
{
throw new NotImplementedException();
}
public override void Visit(DbOfTypeExpression expression)
{
throw new NotImplementedException();
}
public override DbExpressionEntitySetInfo Visit(DbOfTypeExpression expression)
{
return(null);
}
public override IPostgreSqlFragment Visit(DbOfTypeExpression expression)
{
throw new NotImplementedException();
}
public override SqlFragment Visit(DbOfTypeExpression expression)
{
throw new NotSupportedException();
}
public override ViewValidator.DbExpressionEntitySetInfo Visit(
DbOfTypeExpression expression)
{
Check.NotNull <DbOfTypeExpression>(expression, nameof(expression));
return((ViewValidator.DbExpressionEntitySetInfo)null);
}
/// <summary>
/// Implements the visitor pattern for <see cref="T:System.Data.Common.CommandTrees.DbOfTypeExpression"/>.
/// </summary>
/// <param name="expression">The <see cref="T:System.Data.Common.CommandTrees.DbOfTypeExpression"/> that is visited.</param>
public override void Visit(DbOfTypeExpression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
expression.Argument.Accept(this);
}
public override bool Visit(DbOfTypeExpression expression)
{
return(VisitUnaryExpression(expression));
}
public override void Visit(DbOfTypeExpression e)
{
Check.NotNull(e, "e");
BeginUnary(e);
Dump(e.OfType, "OfType");
End(e);
}
public override void Visit(DbOfTypeExpression expression) { }
/// <summary>
/// Visitor pattern method for <see cref="DbOfTypeExpression" />.
/// </summary>
/// <param name="expression"> The DbOfTypeExpression that is being visited. </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="expression" />
/// is null
/// </exception>
public override void Visit(DbOfTypeExpression expression)
{
Check.NotNull(expression, "expression");
VisitUnaryExpression(expression);
}
/// <summary> /// Visitor pattern method for DbOfTypeExpression. /// </summary> /// <param name="expression"> The DbOfTypeExpression that is being visited. </param> public abstract void Visit(DbOfTypeExpression expression);
public override TReturn Visit(DbOfTypeExpression expression)
{
Check.NotNull(expression, "expression");
throw ConstructNotSupportedException(expression);
}
public override void Visit(DbOfTypeExpression expression)
{
throw new NotSupportedException("Visit(\"OfTypeExpression\") is not supported.");
}
public override void Visit(DbOfTypeExpression expression)
{
VisitUnaryExpression(expression);
}
public override void Visit(DbOfTypeExpression expression)
{
VisitUnaryExpression(expression);
}
/// <summary>
/// Implements the visitor pattern for <see cref="T:System.Data.Common.CommandTrees.DbOfTypeExpression"/>.
/// </summary>
/// <param name="expression">The <see cref="T:System.Data.Common.CommandTrees.DbOfTypeExpression"/> that is visited.</param>
public override void Visit(DbOfTypeExpression expression)
{
expression.Argument.Accept(this);
}
