public override bool Equals(object obj)
{
if (!(obj is PropertyFragment))
{
return(false);
}
PropertyFragment prop = obj as PropertyFragment;
Debug.Assert(Properties != null && prop.Properties != null);
int aIndex = Properties.Count - 1;
int bIndex = prop.Properties.Count - 1;
int cnt = 0;
while (aIndex >= 0 && bIndex >= 0)
{
if (String.Compare(Properties[aIndex--], prop.Properties[bIndex--], true) != 0)
{
return(false);
}
if (++cnt == 2)
{
break;
}
}
return(true);
}
public void PushInput(string inputName)
{
if (PropertyFragment == null)
{
PropertyFragment = new PropertyFragment();
}
PropertyFragment.PushProperty(inputName);
}
public PropertyFragment Clone()
{
PropertyFragment newPF = new PropertyFragment();
foreach (string prop in Properties)
{
newPF.Properties.Add(prop);
}
return(newPF);
}
public ColumnFragment GetColumnFromProperties(PropertyFragment properties)
{
ColumnFragment col = Left.GetColumnFromProperties(properties);
if (col == null)
{
col = Right.GetColumnFromProperties(properties);
}
return(col);
}
public override SqlFragment Visit(DbPropertyExpression expression)
{
propertyLevel++;
PropertyFragment fragment = expression.Instance.Accept(this) as PropertyFragment;
fragment.Properties.Add(expression.Property.Name);
propertyLevel--;
// if we are not at the top level property then just return
if (propertyLevel > 0)
{
return(fragment);
}
ColumnFragment column = new ColumnFragment(null, fragment.LastProperty);
column.PropertyFragment = fragment;
InputFragment input = scope.FindInputFromProperties(fragment);
if (input != null)
{
column.TableName = input.Name;
}
// now we need to check if our column name was possibly renamed
if (input is TableFragment)
{
if (!string.IsNullOrEmpty(input.Name))
{
SelectStatement sf = scope.GetFragment(input.Name) as SelectStatement;
if (sf != null)
{
// Special case: undo alias in case of query fusing
for (int i = 0; i < sf.Columns.Count; i++)
{
ColumnFragment cf = sf.Columns[i];
if (column.ColumnName == cf.ColumnAlias)
{
column.ColumnName = cf.ColumnName;
column.ColumnAlias = cf.ColumnAlias;
column.TableName = input.Name;
return(column);
}
}
}
}
return(column);
}
SelectStatement select = input as SelectStatement;
UnionFragment union = input as UnionFragment;
if (select != null)
{
select.HasDifferentNameForColumn(column);
}
else if (union != null)
{
union.HasDifferentNameForColumn(column);
}
// input is a table, selectstatement, or unionstatement
return(column);
}