/// <summary>
/// returns a rule rule from the repository or creates a new one and returns this
/// </summary>
/// <param name="handle"></param>
/// <returns></returns>
public SelectionRule GetSelectionRule(string id = null)
{
if (_repository .HasSelectionRule (id)) return _repository .GetSelectionRule (id);
SelectionRule aRule = new SelectionRule(id);
_repository.AddSelectionRule(aRule.ID, aRule);
return aRule;
}
/// <summary>
/// builds the XPT node of this
/// </summary>
/// <param name="ctx"></param>
/// <returns></returns>
public bool BuildXPTNode(SelectionRulezContext ctx)
{
// $ctx.XPTreeNode = (eXPressionTree.IeXPressionTree) new SelectionRule($ctx.ruleid().GetText(), engine: this.Engine);
// get the name
SelectionRule aRule = new SelectionRule(ctx.ruleid().GetText(), engine: this.Engine);
ctx.XPTreeNode = aRule;
// add expression
if (ctx.selection() != null) {
aRule.Selection = new SelectionStatementBlock(engine: this.Engine);
aRule.Selection.Add(new @Return((SelectionExpression)ctx.selection().XPTreeNode));
}
else if (ctx.selectStatementBlock() != null) aRule.Selection = (SelectionStatementBlock)ctx.selectStatementBlock().XPTreeNode;
// add the parameters
foreach (ParameterDefinition aParameter in ctx.names.Values)
{
ISymbol symbol = aRule.AddNewParameter(aParameter.name, datatype: aParameter.datatype);
// defaultvalue assignment
if (aParameter.defaultvalue != null) aRule.Selection.Nodes.Insert(0, new eXPressionTree.IfThenElse(
eXPressionTree.CompareExpression.EQ(symbol, new Literal(null, otDataType.@Null)),
new eXPressionTree.Assignment(symbol, (IExpression)aParameter.defaultvalue)));
}
return true;
}
/// <summary>
/// generate theCode for a rule rule
/// </summary>
/// <param name="rule"></param>
/// <returns></returns>
public bool Generate(SelectionRule rule, out ICodeBit code)
{
try
{
bool result = true;
code = null;
// check if the object to which data engine
foreach (iDataObjectEngine aDataEngine in _dataobjectEngines.Reverse <iDataObjectEngine > () )
{
foreach (String aName in rule.ResultingObjectnames () )
result &= aDataEngine.Objects.HasObjectDefinition(id: aName);
if (result)
return aDataEngine.Generate((rule as eXPressionTree.IRule), out code);
}
// failure
if (!result)
{
String theNames = DataType.ToString(rule.ResultingObjectnames());
throw new RulezException(RulezException.Types.NoDataEngineAvailable, arguments: new object[] { theNames });
}
return false;
}
catch (Exception ex)
{
throw new RulezException(RulezException.Types.GenerateFailed, inner: ex);
}
}