protected virtual void Prepare()
{
Expression expression = _elaboratedExpression.Expression;
_tableVar = _elaboratedExpression.MainElaboratedTableVar.TableVar;
Schema.Order order = GetDefaultOrder(_tableVar);
if (order != null)
{
BaseOrderExpression browseExpression;
if (Convert.ToBoolean(DerivationUtility.GetTag(_tableVar.MetaData, "UseBrowse", _elaboratedExpression.PageType, "True")))
{
browseExpression = new BrowseExpression();
}
else
{
browseExpression = new OrderExpression();
}
browseExpression.Expression = expression;
foreach (Schema.OrderColumn column in order.Columns)
{
OrderColumnDefinition definition = column.EmitStatement(EmitMode.ForCopy) as OrderColumnDefinition;
definition.ColumnName = Schema.Object.Qualify(column.Column.Name, _elaboratedExpression.MainElaboratedTableVar.ElaboratedName);
browseExpression.Columns.Add(definition);
}
expression = browseExpression;
}
_expression =
new D4TextEmitter().Emit
(
new CursorDefinition
(
expression,
CursorCapability.Navigable |
CursorCapability.BackwardsNavigable |
CursorCapability.Bookmarkable |
CursorCapability.Searchable |
CursorCapability.Updateable,
CursorIsolation.Browse,
CursorType.Dynamic
)
);
// Build the derivation info structure for use in structuring, layout and document production.
_derivationInfo = new DerivationInfo();
_derivationInfo.Program = _program;
_derivationInfo.Process = _process;
_derivationInfo.PageType = _seed.PageType;
_derivationInfo.Query = _seed.Query;
_derivationInfo.Elaborate = _seed.Elaborate;
_derivationInfo.MasterKeyNames = _seed.MasterKeyNames;
_derivationInfo.DetailKeyNames = _seed.DetailKeyNames;
_derivationInfo.KeyNames = GetKeyNames(_tableVar);
_derivationInfo.Expression = _expression;
_derivationInfo.ElaboratedExpression = _elaboratedExpression;
_derivationInfo.TableVar = _tableVar;
_derivationInfo.MainSourceName = DerivationUtility.MainSourceName;
_derivationInfo.IsReadOnly = DerivationUtility.IsReadOnlyPageType(_seed.PageType);
}
public override Statement EmitStatement(EmitMode mode)
{
if (IsAccelerator)
{
return(Nodes[0].EmitStatement(mode));
}
else
{
BrowseExpression browseExpression = new BrowseExpression();
browseExpression.Expression = (Expression)Nodes[0].EmitStatement(mode);
for (int index = 0; index < RequestedOrder.Columns.Count; index++)
{
browseExpression.Columns.Add(RequestedOrder.Columns[index].EmitStatement(mode));
}
return(browseExpression);
}
}
protected override string InternalGetExpression()
{
Expression expression = GetSeedExpression();
OrderExpression saveOrderExpression = expression as OrderExpression;
BrowseExpression saveBrowseExpression = expression as BrowseExpression;
if (saveOrderExpression != null)
{
expression = saveOrderExpression.Expression;
}
if (saveBrowseExpression != null)
{
expression = saveBrowseExpression.Expression;
}
// Eat irrelevant browse and order operators
OrderExpression orderExpression = null;
BrowseExpression browseExpression = null;
while (((orderExpression = expression as OrderExpression) != null) || ((browseExpression = expression as BrowseExpression) != null))
{
if (orderExpression != null)
{
expression = orderExpression.Expression;
orderExpression = null;
}
if (browseExpression != null)
{
expression = browseExpression.Expression;
browseExpression = null;
}
}
if (IsMasterSetup() && _writeWhereClause)
{
expression = MergeRestrictCondition
(
expression,
GetMasterDetailCondition(DetailKey)
);
}
if (_filter != String.Empty)
{
expression = MergeRestrictCondition
(
expression,
_parser.ParseExpression(_filter)
);
}
if (IsAdorned())
{
AdornExpression adornExpression = new AdornExpression();
adornExpression.Expression = expression;
adornExpression.Expressions.AddRange(_columns);
adornExpression.Constraints.AddRange(_constraints);
adornExpression.Orders.AddRange(_orders);
adornExpression.Keys.AddRange(_keys);
expression = adornExpression;
}
if (_orderDefinition != null)
{
if (_useBrowse)
{
browseExpression = new Language.D4.BrowseExpression();
browseExpression.Expression = expression;
browseExpression.Columns.AddRange(_orderDefinition.Columns);
expression = browseExpression;
}
else
{
orderExpression = new Language.D4.OrderExpression();
orderExpression.Expression = expression;
orderExpression.Columns.AddRange(_orderDefinition.Columns);
expression = orderExpression;
}
}
else if (_order != null)
{
if (_useBrowse)
{
browseExpression = new BrowseExpression();
foreach (Schema.OrderColumn column in _order.Columns)
{
if (column.IsDefaultSort)
{
browseExpression.Columns.Add(new OrderColumnDefinition(column.Column.Name, column.Ascending, column.IncludeNils));
}
else
{
browseExpression.Columns.Add(new OrderColumnDefinition(column.Column.Name, column.Ascending, column.IncludeNils, column.Sort.EmitDefinition(EmitMode.ForCopy)));
}
}
browseExpression.Expression = expression;
expression = browseExpression;
}
else
{
orderExpression = new OrderExpression();
foreach (Schema.OrderColumn column in _order.Columns)
{
if (column.IsDefaultSort)
{
orderExpression.Columns.Add(new OrderColumnDefinition(column.Column.Name, column.Ascending, column.IncludeNils));
}
else
{
orderExpression.Columns.Add(new OrderColumnDefinition(column.Column.Name, column.Ascending, column.IncludeNils, column.Sort.EmitDefinition(EmitMode.ForCopy)));
}
}
orderExpression.Expression = expression;
expression = orderExpression;
}
}
else
{
if (saveOrderExpression != null)
{
saveOrderExpression.Expression = expression;
expression = saveOrderExpression;
}
else if (saveBrowseExpression != null)
{
saveBrowseExpression.Expression = expression;
expression = saveBrowseExpression;
}
}
CursorDefinition cursorExpression = new CursorDefinition(expression);
cursorExpression.Isolation = _requestedIsolation;
cursorExpression.Capabilities = _requestedCapabilities;
cursorExpression.SpecifiesType = true;
cursorExpression.CursorType = _cursorType;
return(new D4TextEmitter().Emit(cursorExpression));
}
