/// <summary>
/// Applies the query to the given store
/// </summary>
public RDFSelectQueryResult ApplyToStore(RDFStore store)
{
if (store != null)
{
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFSelectQueryResult selectResult = new RDFSelectQueryResult(this.ToString());
if (!this.IsEmpty)
{
//Iterate the pattern groups of the query
foreach (RDFPatternGroup patternGroup in this.PatternGroups)
{
//Step 1: Get the intermediate result tables of the current pattern group
RDFSelectQueryEngine.EvaluatePatterns(this, patternGroup, store);
//Step 2: Get the result table of the current pattern group
RDFSelectQueryEngine.CombinePatterns(this, patternGroup);
//Step 3: Apply the filters of the current pattern group to its result table
RDFSelectQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 4: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList <DataTable>(), false);
//Step 5: Apply the modifiers of the query to the result table
selectResult.SelectResults = RDFSelectQueryEngine.ApplyModifiers(this, queryResultTable);
}
return(selectResult);
}
throw new RDFQueryException("Cannot execute SELECT query because given \"store\" parameter is null.");
}
/// <summary>
/// Applies the query to the given federation
/// </summary>
public RDFSelectQueryResult ApplyToFederation(RDFFederation federation)
{
if (federation != null)
{
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFSelectQueryResult selectResult = new RDFSelectQueryResult(this.ToString());
if (!this.IsEmpty)
{
//Iterate the pattern groups of the query
var fedPatternResultTables = new Dictionary <RDFPatternGroup, List <DataTable> >();
foreach (RDFPatternGroup patternGroup in this.PatternGroups)
{
#region TrueFederations
foreach (RDFStore store in federation.Stores.Values)
{
//Step 1: Evaluate the patterns of the current pattern group on the current store
RDFSelectQueryEngine.EvaluatePatterns(this, patternGroup, store);
//Step 2: Federate the patterns of the current pattern group on the current store
if (!fedPatternResultTables.ContainsKey(patternGroup))
{
fedPatternResultTables.Add(patternGroup, this.PatternResultTables[patternGroup]);
}
else
{
fedPatternResultTables[patternGroup].ForEach(fprt =>
fprt.Merge(this.PatternResultTables[patternGroup].Single(prt => prt.TableName.Equals(fprt.TableName, StringComparison.Ordinal)), true, MissingSchemaAction.Add));
}
}
this.PatternResultTables[patternGroup] = fedPatternResultTables[patternGroup];
#endregion
//Step 3: Get the result table of the current pattern group
RDFSelectQueryEngine.CombinePatterns(this, patternGroup);
//Step 4: Apply the filters of the current pattern group to its result table
RDFSelectQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 5: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList <DataTable>(), false);
//Step 6: Apply the modifiers of the query to the result table
selectResult.SelectResults = RDFSelectQueryEngine.ApplyModifiers(this, queryResultTable);
}
return(selectResult);
}
throw new RDFQueryException("Cannot execute SELECT query because given \"federation\" parameter is null.");
}
