private static void ParseGroupBy(string apply, QuerySpec spec, TableSpec tabSpec)
{
if (string.IsNullOrEmpty(apply))
{
return;
}
var lexer = new ODataTranslatorLexer(new AntlrInputStream(apply), tabSpec, spec);
CommonTokenStream tokens = new CommonTokenStream(lexer);
// Pass the tokens to the parser
var parser = new ODataTranslatorParser(tokens, tabSpec, spec);
// Run root rule ("apply" in this grammar)
parser.apply();
if (parser.Aggregates.Count == 0)
{
_log.ErrorFormat("Cannot extract agregates from $apply= {apply} value. ", apply);
throw new ArgumentException("Cannot parse $apply operator.", "$apply");
}
spec.select = parser.GroupBy;
foreach (var a in parser.Aggregates)
{
spec.select += ((spec.select == null) ?"":",") + a.AggregateColumnAlias + "=" + a.AggregateMethod + "(" + a.AggregateColumn + ")";
}
spec.groupBy = parser.GroupBy;
}
internal static void SetValidationScope(this ODataTranslatorParser parser, string tableName)
{
if (!parser.tableSpec.Relations.ContainsKey(tableName))
{
throw new InvalidOperationException("Cannot validate entity " + tableName + " because it is not registered as a relation.");
}
parser.currentTableScopeSpec = parser.tableSpec.Relations[tableName];
}
internal static void AddAggregateExpression(this ODataTranslatorParser parser, string Method, string Column, string Alias)
{
var agg = new Aggregate()
{
AggregateMethod = Method, AggregateColumn = Column, AggregateColumnAlias = Alias
};
parser.Aggregates.AddLast(agg);
}
private static void ParseExpand(StringValues expand, QuerySpec spec, TableSpec tabSpec)
{
if (string.IsNullOrEmpty(expand))
{
return;
}
var lexer = new ODataTranslatorLexer(new AntlrInputStream(expand), tabSpec, spec);
CommonTokenStream tokens = new CommonTokenStream(lexer);
// Pass the tokens to the parser
var parser = new ODataTranslatorParser(tokens, tabSpec, spec);
spec.expand = new System.Collections.Generic.Dictionary <string, QuerySpec>();
// Run rule "expandItems" in this grammar
parser.expandItems();
spec.expand = parser.Relations;
}
private static void ParseOrderBy(TableSpec tabSpec, string orderby, QuerySpec spec)
{
if (!string.IsNullOrWhiteSpace(orderby))
{
spec.order = new Hashtable();
foreach (var colDir in orderby.Split(','))
{
string dir = "asc", column = colDir;
if (colDir.EndsWith(" desc"))
{
dir = "desc";
column = colDir.Substring(0, colDir.Length - 5).Trim();
}
else if (colDir.EndsWith(" asc"))
{
column = colDir.Substring(0, colDir.Length - 4).Trim();
}
if (EnableODataExtensions)
{
var lexer = new ODataTranslatorLexer(new AntlrInputStream(column), tabSpec, spec);
CommonTokenStream tokens = new CommonTokenStream(lexer);
// Pass the tokens to the parser
var parser = new ODataTranslatorParser(tokens, tabSpec, spec);
parser.ErrorHandler = FastFail;
var orderBy = parser.orderBy();
column = orderBy.Expression + " " + orderBy.Direction;
if (string.IsNullOrWhiteSpace(column))
{
_log.ErrorFormat("Cannot extract order by clause from $orderby= {orderby} value. ", orderby);
throw new ArgumentException("Cannot parse $orderby parameter.", "$orderby");
}
}
else
{
tabSpec.HasColumn(column);
}
spec.order.Add(column, dir);
}
spec.IsOrderClauseValidated = true;
}
}
internal static void ValidateColumn(this ODataTranslatorParser parser, string name)
{
parser.currentTableScopeSpec.HasColumn(name);
}
internal static void ResetValidationScope(this ODataTranslatorParser parser)
{
parser.currentTableScopeSpec = parser.tableSpec;
}
internal static void AddExpandRelation(this ODataTranslatorParser parser, string name, Dictionary <string, string> props)
{
if (parser.tableSpec.Relations == null)
{
throw new System.Exception("Relations are not specified in the table.");
}
if (!parser.tableSpec.Relations.ContainsKey(name))
{
throw new System.Exception("Relation " + name + " is not found in the table.");
}
TableSpec relation = parser.tableSpec.Relations[name];
QuerySpec s = null;
if (props != null && props.Count > 0)
{
var top = -1;
var skip = -1;
if ((props.ContainsKey("top") && props["top"] != null)
||
(props.ContainsKey("skip") && props["skip"] != null)) // recover actual value that lexer sanitized and replaced with parameter.
{
foreach (var p in parser.querySpec.parameters)
{
if (props.ContainsKey("top") && props["top"] != null && p.ParameterName == props["top"])
{
top = System.Convert.ToInt16(p.Value);
}
if (props.ContainsKey("skip") && props["skip"] != null && p.ParameterName == props["skip"])
{
skip = System.Convert.ToInt16(p.Value);
}
// if top is not provided or already set and if $skip is not provided or already set, skip the further search.
if ((!props.ContainsKey("top") || props["top"] == null || top != -1)
&&
(!props.ContainsKey("skip") || props["skip"] == null || skip != -1))
{
break;
}
}
}
s = new QuerySpec()
{
select = props.ContainsKey("select") ? props["select"] : relation.columnList,
top = top,
skip = skip,
predicate = props.ContainsKey("filter") ? relation.primaryKey + " AND (" + props["filter"] + ")": relation.primaryKey
};
if (props.ContainsKey("orderBy"))
{
s.order = new System.Collections.Hashtable();
s.order.Add(props["orderBy"], "");
}
}
else
{
s = new QuerySpec()
{
select = relation.columnList,
predicate = relation.primaryKey
}
};
parser.Relations.Add(name, s);
}
