/// <summary>
/// Renders the object model in it's EPL syntax textual representation, using a whitespace-formatter as provided.
/// </summary>
/// <param name="formatter">the formatter to use</param>
/// <param name="writer">writer to use</param>
/// <throws>IllegalStateException if required clauses do not exist</throws>
public void ToEPL(
EPStatementFormatter formatter,
TextWriter writer)
{
AnnotationPart.ToEPL(writer, Annotations, formatter);
ExpressionDeclaration.ToEPL(writer, ExpressionDeclarations, formatter);
ScriptExpression.ToEPL(writer, ScriptExpressions, formatter);
ClassProvidedExpression.ToEPL(writer, ClassProvidedExpressions, formatter);
if (ContextName != null)
{
formatter.BeginContext(writer);
writer.Write("context ");
writer.Write(ContextName);
}
if (CreateIndex != null)
{
formatter.BeginCreateIndex(writer);
CreateIndex.ToEPL(writer);
return;
}
if (CreateSchema != null)
{
formatter.BeginCreateSchema(writer);
CreateSchema.ToEPL(writer);
return;
}
if (CreateExpression != null)
{
formatter.BeginCreateExpression(writer);
CreateExpression.ToEPL(writer);
return;
}
if (CreateClass != null)
{
formatter.BeginCreateExpression(writer);
CreateClass.ToEPL(writer);
return;
}
if (CreateContext != null)
{
formatter.BeginCreateContext(writer);
CreateContext.ToEPL(writer, formatter);
return;
}
if (CreateWindow != null)
{
formatter.BeginCreateWindow(writer);
CreateWindow.ToEPL(writer);
writer.Write(" as ");
if (SelectClause == null || SelectClause.SelectList.IsEmpty() && !CreateWindow.Columns.IsEmpty())
{
CreateWindow.ToEPLCreateTablePart(writer);
}
else
{
SelectClause.ToEPL(writer, formatter, false, false);
if (CreateWindow.AsEventTypeName != null)
{
writer.Write(" from ");
writer.Write(CreateWindow.AsEventTypeName);
}
CreateWindow.ToEPLInsertPart(writer);
}
return;
}
if (CreateVariable != null)
{
formatter.BeginCreateVariable(writer);
CreateVariable.ToEPL(writer);
return;
}
if (CreateTable != null)
{
formatter.BeginCreateTable(writer);
CreateTable.ToEPL(writer);
return;
}
if (CreateDataFlow != null)
{
formatter.BeginCreateDataFlow(writer);
CreateDataFlow.ToEPL(writer, formatter);
return;
}
var displayWhereClause = true;
if (UpdateClause != null)
{
formatter.BeginUpdate(writer);
UpdateClause.ToEPL(writer);
}
else if (OnExpr != null)
{
formatter.BeginOnTrigger(writer);
writer.Write("on ");
FromClause.Streams[0].ToEPL(writer, formatter);
if (OnExpr is OnDeleteClause onDeleteClause)
{
formatter.BeginOnDelete(writer);
writer.Write("delete from ");
onDeleteClause.ToEPL(writer);
}
else if (OnExpr is OnUpdateClause onUpdateClause)
{
formatter.BeginOnUpdate(writer);
writer.Write("update ");
onUpdateClause.ToEPL(writer);
}
else if (OnExpr is OnSelectClause onSelectClause)
{
InsertInto?.ToEPL(writer, formatter, true);
SelectClause.ToEPL(writer, formatter, true, onSelectClause.IsDeleteAndSelect);
writer.Write(" from ");
onSelectClause.ToEPL(writer);
}
else if (OnExpr is OnSetClause onSetClause)
{
onSetClause.ToEPL(writer, formatter);
}
else if (OnExpr is OnMergeClause onMergeClause)
{
onMergeClause.ToEPL(writer, WhereClause, formatter);
displayWhereClause = false;
}
else
{
var split = (OnInsertSplitStreamClause)OnExpr;
InsertInto.ToEPL(writer, formatter, true);
SelectClause.ToEPL(writer, formatter, true, false);
if (WhereClause != null)
{
writer.Write(" where ");
WhereClause.ToEPL(writer, ExpressionPrecedenceEnum.MINIMUM);
}
split.ToEPL(writer, formatter);
displayWhereClause = false;
}
}
else
{
IntoTableClause?.ToEPL(writer);
if (SelectClause == null)
{
throw new IllegalStateException("Select-clause has not been defined");
}
if (FromClause == null)
{
throw new IllegalStateException("From-clause has not been defined");
}
if (FireAndForgetClause is FireAndForgetUpdate fireAndForgetUpdate)
{
writer.Write("update ");
FromClause.ToEPLOptions(writer, formatter, false);
writer.Write(" ");
UpdateClause.RenderEPLAssignments(writer, fireAndForgetUpdate.Assignments);
}
else if (FireAndForgetClause is FireAndForgetInsert fireAndForgetInsert)
{
InsertInto.ToEPL(writer, formatter, true);
if (fireAndForgetInsert.IsUseValuesKeyword)
{
writer.Write(" values (");
var delimiter = "";
foreach (var element in SelectClause.SelectList)
{
writer.Write(delimiter);
element.ToEPLElement(writer);
delimiter = ", ";
}
writer.Write(")");
}
else
{
SelectClause.ToEPL(writer, formatter, true, false);
}
}
else if (FireAndForgetClause is FireAndForgetDelete)
{
writer.Write("delete ");
FromClause.ToEPLOptions(writer, formatter, true);
}
else
{
InsertInto?.ToEPL(writer, formatter, true);
SelectClause.ToEPL(writer, formatter, true, false);
FromClause.ToEPLOptions(writer, formatter, true);
}
}
MatchRecognizeClause?.ToEPL(writer);
if (WhereClause != null && displayWhereClause)
{
formatter.BeginWhere(writer);
writer.Write("where ");
WhereClause.ToEPL(writer, ExpressionPrecedenceEnum.MINIMUM);
}
if (GroupByClause != null)
{
formatter.BeginGroupBy(writer);
writer.Write("group by ");
GroupByClause.ToEPL(writer);
}
if (HavingClause != null)
{
formatter.BeginHaving(writer);
writer.Write("having ");
HavingClause.ToEPL(writer, ExpressionPrecedenceEnum.MINIMUM);
}
if (OutputLimitClause != null)
{
formatter.BeginOutput(writer);
writer.Write("output ");
OutputLimitClause.ToEPL(writer);
}
if (OrderByClause != null)
{
formatter.BeginOrderBy(writer);
writer.Write("order by ");
OrderByClause.ToEPL(writer);
}
if (RowLimitClause != null)
{
formatter.BeginLimit(writer);
writer.Write("limit ");
RowLimitClause.ToEPL(writer);
}
if (ForClause != null)
{
formatter.BeginFor(writer);
ForClause.ToEPL(writer);
}
}
/// <summary>
/// Specify a group-by-clause.
/// </summary>
/// <param name="groupByClause">specifies the group-by-clause, which is optional and can be null</param>
/// <returns>model</returns>
public EPStatementObjectModel SetGroupBy(GroupByClause groupByClause)
{
GroupByClause = groupByClause;
return(this);
}
