public static string ExtractRootName(SqlCollectionExpression expression)
{
SqlRootNameExtractor extractor = new SqlRootNameExtractor();
extractor.Visit(expression);
return(extractor.rootName);
}
protected void Visit(SqlCollectionExpression expression)
{
switch (expression.Kind)
{
case SqlObjectKind.AliasedCollectionExpression:
this.Visit(expression as SqlAliasedCollectionExpression);
return;
case SqlObjectKind.ArrayIteratorCollectionExpression:
this.Visit(expression as SqlArrayIteratorCollectionExpression);
return;
case SqlObjectKind.JoinCollectionExpression:
this.Visit(expression as SqlJoinCollectionExpression);
return;
case SqlObjectKind.SubqueryCollectionExpression:
this.Visit(expression as SqlSubqueryCollectionExpression);
return;
default:
throw new InvalidProgramException(
string.Format(CultureInfo.InvariantCulture, "Unexpected SqlObjectKind {0}", expression.Kind));
}
}
private SqlJoinCollectionExpression(
SqlCollectionExpression leftExpression,
SqlCollectionExpression rightExpression)
: base(SqlObjectKind.JoinCollectionExpression)
{
this.LeftExpression = leftExpression;
this.RightExpression = rightExpression;
}
private SqlFromClause(SqlCollectionExpression expression)
: base(SqlObjectKind.FromClause)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
this.Expression = expression;
}
public static SqlFromClause Create(SqlCollectionExpression expression)
{
return(new SqlFromClause(expression));
}
private SqlFromClause(SqlCollectionExpression expression)
{
this.Expression = expression ?? throw new ArgumentNullException(nameof(expression));
}
public static SqlFromClause Create(SqlCollectionExpression expression) => new SqlFromClause(expression);
public static SqlJoinCollectionExpression Create(
SqlCollectionExpression leftExpression,
SqlCollectionExpression rightExpression)
{
return(new SqlJoinCollectionExpression(leftExpression, rightExpression));
}