public override WTableReference ToTableReference()
{
List <WScalarExpression> parameters = new List <WScalarExpression>();
bool isList = false;
if (GremlinUtil.IsList(ConstantValue) || GremlinUtil.IsArray(ConstantValue))
{
isList = true; //1 It's a list
foreach (var value in (IEnumerable)ConstantValue)
{
parameters.Add(SqlUtil.GetValueExpr(value));
}
}
else if (GremlinUtil.IsNumber(ConstantValue) || ConstantValue is string || ConstantValue is bool)
{
parameters.Add(SqlUtil.GetValueExpr(ConstantValue));
}
else
{
throw new ArgumentException();
}
var tableRef = SqlUtil.GetFunctionTableReference(GremlinKeyword.func.Constant, parameters, GetVariableName());
((WConstantReference)tableRef).IsList = isList;
return(SqlUtil.GetCrossApplyTableReference(tableRef));
}
internal override GremlinToSqlContext GetContext()
{
GremlinToSqlContext inputContext = GetInputContext();
if (inputContext.PivotVariable != null)
{
throw new QueryCompilationException("This step only can be a start step.");
}
GremlinFreeVertexVariable newVariable = new GremlinFreeVertexVariable();
inputContext.VariableList.Add(newVariable);
inputContext.TableReferences.Add(newVariable);
inputContext.SetPivotVariable(newVariable);
inputContext.PivotVariable.OutE(inputContext, new List <string>());
if (EdgeIdsOrElements.Count > 0)
{
List <WBooleanExpression> booleanExprList = new List <WBooleanExpression>();
foreach (var id in EdgeIdsOrElements)
{
if (GremlinUtil.IsNumber(id) || id is string)
{
WScalarExpression firstExpr = inputContext.PivotVariable.GetVariableProperty(GremlinKeyword.EdgeID).ToScalarExpression();
WScalarExpression secondExpr = SqlUtil.GetValueExpr(id);
WBooleanComparisonExpression booleanExpr = SqlUtil.GetEqualBooleanComparisonExpr(firstExpr, secondExpr);
booleanExprList.Add(booleanExpr);
}
}
inputContext.AddPredicate(SqlUtil.ConcatBooleanExprWithOr(booleanExprList));
}
return(inputContext);
}
internal static bool IsInjectable(object injection)
{
if (GremlinUtil.IsList(injection) ||
GremlinUtil.IsArray(injection) ||
GremlinUtil.IsNumber(injection) ||
injection is string ||
injection is bool)
{
return(true);
}
else
{
throw new ArgumentException();
}
}
public GraphTraversal2 Constant(object value)
{
if (GremlinUtil.IsList(value) ||
GremlinUtil.IsArray(value) ||
GremlinUtil.IsNumber(value) ||
value is string ||
value is bool)
{
this.AddOperator(new GremlinConstantOp(value));
}
else
{
throw new ArgumentException();
}
return(this);
}
internal override GremlinToSqlContext GetContext()
{
GremlinToSqlContext inputContext = GetInputContext();
GremlinTableVariable newVariable;
if (inputContext.PivotVariable == null ||
inputContext.PivotVariable is GremlinFreeVertexVariable ||
inputContext.PivotVariable is GremlinContextVariable)
{
newVariable = new GremlinFreeVertexVariable();
}
else
{
newVariable = new GremlinBoundVertexVariable();
}
if (VertexIdsOrElements.Count > 0)
{
List <WBooleanExpression> booleanExprList = new List <WBooleanExpression>();
foreach (var id in VertexIdsOrElements)
{
if (GremlinUtil.IsNumber(id) || id is string)
{
WScalarExpression firstExpr =
newVariable.GetVariableProperty(GremlinKeyword.NodeID).ToScalarExpression();
WScalarExpression secondExpr = SqlUtil.GetValueExpr(id);
WBooleanComparisonExpression booleanExpr = SqlUtil.GetEqualBooleanComparisonExpr(firstExpr,
secondExpr);
booleanExprList.Add(booleanExpr);
}
else
{
throw new ArgumentException();
}
}
inputContext.AddPredicate(SqlUtil.ConcatBooleanExprWithOr(booleanExprList));
}
inputContext.VariableList.Add(newVariable);
inputContext.TableReferencesInFromClause.Add(newVariable);
inputContext.SetPivotVariable(newVariable);
return(inputContext);
}
private WBooleanExpression CreateBooleanExpression(GremlinVariableProperty variableProperty, object valuesOrPredicate)
{
if (valuesOrPredicate is string || GremlinUtil.IsNumber(valuesOrPredicate) || valuesOrPredicate is bool)
{
WScalarExpression firstExpr = variableProperty.ToScalarExpression();
WScalarExpression secondExpr = SqlUtil.GetValueExpr(valuesOrPredicate);
return(SqlUtil.GetEqualBooleanComparisonExpr(firstExpr, secondExpr));
}
var predicate = valuesOrPredicate as Predicate;
if (predicate != null)
{
WScalarExpression firstExpr = variableProperty.ToScalarExpression();
WScalarExpression secondExpr = SqlUtil.GetValueExpr(predicate.Value);
return(SqlUtil.GetBooleanComparisonExpr(firstExpr, secondExpr, predicate));
}
throw new ArgumentException();
}
public override WTableReference ToTableReference()
{
List <WScalarExpression> parameters = new List <WScalarExpression>();
if (InputVariable == null)
{
//g.Inject()
parameters.Add(SqlUtil.GetValueExpr(null));
}
else
{
parameters.Add(InputVariable.GetDefaultProjection().ToScalarExpression());
}
bool isList = false;
if (GremlinUtil.IsList(Injection) || GremlinUtil.IsArray(Injection))
{
isList = true; //1 It's a list
foreach (var value in (IEnumerable)Injection)
{
parameters.Add(SqlUtil.GetValueExpr(value));
}
}
else if (GremlinUtil.IsNumber(Injection) || Injection is string || Injection is bool)
{
parameters.Add(SqlUtil.GetValueExpr(Injection));
}
else
{
throw new ArgumentException();
}
var tableRef = SqlUtil.GetFunctionTableReference(GremlinKeyword.func.Inject, parameters, GetVariableName());
((WInjectTableReference)tableRef).IsList = isList;
return(SqlUtil.GetCrossApplyTableReference(tableRef));
}
public GraphTraversal2 Option(object pickToken, GraphTraversal2 traversalOption)
{
if (!(GremlinUtil.IsNumber(pickToken) || pickToken is string || pickToken is GremlinKeyword.Pick || pickToken is bool))
{
throw new ArgumentException();
}
var op = GetEndOp() as GremlinChooseOp;
if (op != null)
{
if (op.Options.ContainsKey(pickToken))
{
throw new SyntaxErrorException(
$"Choose step can only have one traversal per pick token: {pickToken}");
}
op.Options[pickToken] = traversalOption;
return(this);
}
else
{
throw new Exception("Option step only can follow by choose step.");
}
}