/// <summary>
/// Get the result table of the given pattern group
/// </summary>
internal static void CombinePatterns(RDFConstructQuery query, RDFPatternGroup patternGroup)
{
if (patternGroup.Patterns.Any())
{
//Populate pattern group result table
DataTable patternGroupResultTable = RDFQueryEngine.CombineTables(query.PatternResultTables[patternGroup], false);
//Add it to the list of pattern group result tables
query.PatternGroupResultTables.Add(patternGroup, patternGroupResultTable);
//Populate its metadata
query.PatternGroupResultTables[patternGroup].TableName = patternGroup.ToString();
if (!query.PatternGroupResultTables[patternGroup].ExtendedProperties.ContainsKey("IsOptional"))
{
query.PatternGroupResultTables[patternGroup].ExtendedProperties.Add("IsOptional", patternGroup.IsOptional);
}
else
{
query.PatternGroupResultTables[patternGroup].ExtendedProperties["IsOptional"] = patternGroup.IsOptional;
}
if (!query.PatternGroupResultTables[patternGroup].ExtendedProperties.ContainsKey("JoinAsUnion"))
{
query.PatternGroupResultTables[patternGroup].ExtendedProperties.Add("JoinAsUnion", patternGroup.JoinAsUnion);
}
else
{
query.PatternGroupResultTables[patternGroup].ExtendedProperties["JoinAsUnion"] = patternGroup.JoinAsUnion;
}
}
}
/// <summary>
/// Applies the query to the given store
/// </summary>
public RDFAskQueryResult ApplyToStore(RDFStore store)
{
if (store != null)
{
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFAskQueryResult askResult = new RDFAskQueryResult();
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
RDFAskQueryEngine.EvaluatePatterns(this, patternGroup, store);
//Step 2: Get the result table of the current pattern group
RDFAskQueryEngine.CombinePatterns(this, patternGroup);
//Step 3: Apply the filters of the current pattern group to its result table
RDFAskQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 4: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList <DataTable>(), false);
//Step 5: Transform the result into a boolean response
askResult.AskResult = (queryResultTable.Rows.Count > 0);
}
return(askResult);
}
throw new RDFQueryException("Cannot execute ASK query because given \"store\" parameter is null.");
}
/// <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 datasource
/// </summary>
internal RDFConstructQueryResult ApplyToDataSource(RDFDataSource datasource)
{
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFConstructQueryResult constructResult = new RDFConstructQueryResult(this.ToString());
if (this.PatternGroups.Any())
{
//Iterate the pattern groups of the query
var fedPatternResultTables = new Dictionary <RDFPatternGroup, List <DataTable> >();
foreach (var patternGroup in this.PatternGroups)
{
//Step 1: Get the intermediate result tables of the current pattern group
if (datasource.IsFederation())
{
#region TrueFederations
foreach (var store in (RDFFederation)datasource)
{
//Step FED.1: Evaluate the patterns of the current pattern group on the current store
RDFQueryEngine.EvaluatePatterns(this, patternGroup, store);
//Step FED.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
}
else
{
RDFQueryEngine.EvaluatePatterns(this, patternGroup, datasource);
}
//Step 2: Get the result table of the current pattern group
RDFQueryEngine.CombinePatterns(this, patternGroup);
//Step 3: Apply the filters of the current pattern group to its result table
RDFQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 4: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList(), false);
//Step 5: Fill the templates from the result table
DataTable filledResultTable = RDFQueryEngine.FillTemplates(this, queryResultTable);
//Step 6: Apply the modifiers of the query to the result table
constructResult.ConstructResults = RDFQueryEngine.ApplyModifiers(this, filledResultTable);
}
return(constructResult);
}
/// <summary>
/// Applies the query to the given federation
/// </summary>
public RDFConstructQueryResult ApplyToFederation(RDFFederation federation)
{
if (federation != null)
{
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFConstructQueryResult constructResult = new RDFConstructQueryResult(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
RDFConstructQueryEngine.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
RDFConstructQueryEngine.CombinePatterns(this, patternGroup);
//Step 4: Apply the filters of the current pattern group to its result table
RDFConstructQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 5: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList <DataTable>(), false);
//Step 6: Fill the templates from the result table
DataTable filledResultTable = RDFConstructQueryEngine.FillTemplates(this, queryResultTable);
//Step 7: Apply the modifiers of the query to the result table
constructResult.ConstructResults = RDFConstructQueryEngine.ApplyModifiers(this, filledResultTable);
}
return(constructResult);
}
throw new RDFQueryException("Cannot execute CONSTRUCT query because given \"federation\" parameter is null.");
}
/// <summary>
/// Applies the query to the given federation
/// </summary>
public RDFAskQueryResult ApplyToFederation(RDFFederation federation)
{
if (federation != null)
{
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFAskQueryResult askResult = new RDFAskQueryResult();
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
RDFAskQueryEngine.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
RDFAskQueryEngine.CombinePatterns(this, patternGroup);
//Step 4: Apply the filters of the current pattern group to its result table
RDFAskQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 5: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList <DataTable>(), false);
//Step 6: Transform the result into a boolean response
askResult.AskResult = (queryResultTable.Rows.Count > 0);
}
return(askResult);
}
throw new RDFQueryException("Cannot execute ASK query because given \"federation\" parameter is null.");
}
/// <summary>
/// Applies the query to the given store
/// </summary>
public RDFDescribeQueryResult ApplyToStore(RDFStore store)
{
if (store != null)
{
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFDescribeQueryResult describeResult = new RDFDescribeQueryResult(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
RDFDescribeQueryEngine.EvaluatePatterns(this, patternGroup, store);
//Step 2: Get the result table of the current pattern group
RDFDescribeQueryEngine.CombinePatterns(this, patternGroup);
//Step 3: Apply the filters of the current pattern group to its result table
RDFDescribeQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 4: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList <DataTable>(), false);
//Step 5: Describe the terms from the result table
DataTable describeResultTable = RDFDescribeQueryEngine.DescribeTerms(this, store, queryResultTable);
//Step 6: Apply the modifiers of the query to the result table
describeResult.DescribeResults = RDFDescribeQueryEngine.ApplyModifiers(this, describeResultTable);
}
else
{
//In this case the only chance to proceed is to have resources in the describe terms,
//which will be used to search for S-P-O data. Variables are omitted in this scenario.
if (this.DescribeTerms.Any(dt => dt is RDFResource))
{
//Step 1: Describe the terms from the result table
DataTable describeResultTable = RDFDescribeQueryEngine.DescribeTerms(this, store, new DataTable());
//Step 2: Apply the modifiers of the query to the result table
describeResult.DescribeResults = RDFDescribeQueryEngine.ApplyModifiers(this, describeResultTable);
}
}
return(describeResult);
}
throw new RDFQueryException("Cannot execute DESCRIBE query because given \"store\" parameter is null.");
}
/// <summary>
/// Applies the query to the given graph
/// </summary>
public RDFConstructQueryResult ApplyToGraph(RDFGraph graph)
{
if (graph != null)
{
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFConstructQueryResult constructResult = new RDFConstructQueryResult(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
RDFConstructQueryEngine.EvaluatePatterns(this, patternGroup, graph);
//Step 2: Get the result table of the current pattern group
RDFConstructQueryEngine.CombinePatterns(this, patternGroup);
//Step 3: Apply the filters of the current pattern group to its result table
RDFConstructQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 4: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList <DataTable>(), false);
//Step 5: Fill the templates from the result table
DataTable filledResultTable = RDFConstructQueryEngine.FillTemplates(this, queryResultTable);
//Step 6: Apply the modifiers of the query to the result table
constructResult.ConstructResults = RDFConstructQueryEngine.ApplyModifiers(this, filledResultTable);
}
return(constructResult);
}
throw new RDFQueryException("Cannot execute CONSTRUCT query because given \"graph\" parameter is null.");
}
/// <summary>
/// Applies the query to the given federation
/// </summary>
public RDFDescribeQueryResult ApplyToFederation(RDFFederation federation)
{
if (federation != null)
{
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFDescribeQueryResult describeResult = new RDFDescribeQueryResult(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
RDFDescribeQueryEngine.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
RDFDescribeQueryEngine.CombinePatterns(this, patternGroup);
//Step 4: Apply the filters of the current pattern group to its result table
RDFDescribeQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 5: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList <DataTable>(), false);
//Step 6: Describe the terms on each store and merge them in the federated result table
DataTable describeResultTable = new DataTable(this.ToString());
foreach (RDFStore store in federation.Stores.Values)
{
describeResultTable.Merge(RDFDescribeQueryEngine.DescribeTerms(this, store, queryResultTable), true, MissingSchemaAction.Add);
}
//Step 7: Apply the modifiers of the query to the result table
describeResult.DescribeResults = RDFDescribeQueryEngine.ApplyModifiers(this, describeResultTable);
}
else
{
//In this case the only chance to proceed is to have resources in the describe terms,
//which will be used to search for S-P-O data. Variables are ignored in this scenario.
if (this.DescribeTerms.Any(dt => dt is RDFResource))
{
//Step 1: Describe the terms on each store and merge them in the federated result table
DataTable describeResultTable = new DataTable(this.ToString());
foreach (RDFStore store in federation.Stores.Values)
{
describeResultTable.Merge(RDFDescribeQueryEngine.DescribeTerms(this, store, new DataTable()), true, MissingSchemaAction.Add);
}
//Step 2: Apply the modifiers of the query to the result table
describeResult.DescribeResults = RDFDescribeQueryEngine.ApplyModifiers(this, describeResultTable);
}
}
return(describeResult);
}
throw new RDFQueryException("Cannot execute DESCRIBE query because given \"federation\" parameter is null.");
}
/// <summary>
/// Applies the query to the given datasource
/// </summary>
internal RDFDescribeQueryResult ApplyToDataSource(RDFDataSource datasource)
{
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFDescribeQueryResult describeResult = new RDFDescribeQueryResult(this.ToString());
if (this.PatternGroups.Any())
{
//Iterate the pattern groups of the query
var fedPatternResultTables = new Dictionary <RDFPatternGroup, List <DataTable> >();
foreach (var patternGroup in this.PatternGroups)
{
//Step 1: Get the intermediate result tables of the current pattern group
if (datasource.IsFederation())
{
#region TrueFederations
foreach (var store in (RDFFederation)datasource)
{
//Step FED.1: Evaluate the patterns of the current pattern group on the current store
RDFQueryEngine.EvaluatePatterns(this, patternGroup, store);
//Step FED.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
}
else
{
RDFQueryEngine.EvaluatePatterns(this, patternGroup, datasource);
}
//Step 2: Get the result table of the current pattern group
RDFQueryEngine.CombinePatterns(this, patternGroup);
//Step 3: Apply the filters of the current pattern group to its result table
RDFQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 4: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList(), false);
//Step 5: Describe the terms from the result table
DataTable describeResultTable = new DataTable(this.ToString());
if (datasource.IsFederation())
{
#region TrueFederations
foreach (var store in (RDFFederation)datasource)
{
describeResultTable.Merge(RDFQueryEngine.DescribeTerms(this, store, queryResultTable), true, MissingSchemaAction.Add);
}
#endregion
}
else
{
describeResultTable = RDFQueryEngine.DescribeTerms(this, datasource, queryResultTable);
}
//Step 6: Apply the modifiers of the query to the result table
describeResult.DescribeResults = RDFQueryEngine.ApplyModifiers(this, describeResultTable);
}
else
{
//In this case the only chance to proceed is to have resources in the describe terms,
//which will be used to search for S-P-O data. Variables are ignored in this scenario.
if (this.DescribeTerms.Any(dt => dt is RDFResource))
{
//Step 1: Describe the terms from the result table
DataTable describeResultTable = new DataTable(this.ToString());
if (datasource.IsFederation())
{
#region TrueFederations
foreach (var store in (RDFFederation)datasource)
{
describeResultTable.Merge(RDFQueryEngine.DescribeTerms(this, store, new DataTable()), true, MissingSchemaAction.Add);
}
#endregion
}
else
{
describeResultTable = RDFQueryEngine.DescribeTerms(this, datasource, new DataTable());
}
//Step 2: Apply the modifiers of the query to the result table
describeResult.DescribeResults = RDFQueryEngine.ApplyModifiers(this, describeResultTable);
}
}
return(describeResult);
}