public override void Init(VariableBinding[] variables, bool distinct, bool ordered) {
output.WriteStartElement("sparql");
output.WriteAttributeString("xmlns", "http://www.w3.org/2005/sparql-results#");
output.WriteStartElement("head");
foreach (VariableBinding var in variables) {
if (var.Name == null) continue;
output.WriteStartElement("variable");
output.WriteAttributeString("name", var.Name);
output.WriteEndElement();
}
output.WriteEndElement(); // head
output.WriteStartElement("results");
output.WriteAttributeString("ordered", ordered ? "true" : "false");
output.WriteAttributeString("distinct", distinct ? "true" : "false");
// instead of <results>, we might want <boolean>true</boolean>
}
public override bool Add(VariableBinding[] result) {
output.WriteStartElement("result");
foreach (VariableBinding var in result) {
if (var.Name == null) continue;
output.WriteStartElement("binding");
output.WriteAttributeString("name", var.Name);
if (var.Target == null) {
output.WriteStartElement("unbound");
output.WriteEndElement();
} else if (var.Target.Uri != null) {
output.WriteElementString("uri", var.Target.Uri);
} else if (var.Target is Literal) {
output.WriteStartElement("literal");
Literal literal = (Literal)var.Target;
if (literal.DataType != null)
output.WriteAttributeString("datatype", literal.DataType);
if (literal.Language != null)
output.WriteAttributeString("xml", "lang", null, literal.Language);
output.WriteString(literal.Value);
output.WriteEndElement();
} else {
string id;
if (blankNodes.ContainsKey(var.Target))
id = (string)blankNodes[var.Target];
else {
id = "r" + (++blankNodeCounter);
blankNodes[var.Target] = id;
}
output.WriteStartElement("bnode");
output.WriteString(id);
output.WriteEndElement();
}
output.WriteEndElement();
}
output.WriteEndElement();
return true;
}
public override bool Add(VariableBinding[] result) {
output.WriteLine("<tr>");
foreach (VariableBinding var in result) {
if (var.Name == null) continue;
string t = var.Target.ToString();
if (var.Target is Literal) t = ((Literal)var.Target).Value;
t = t.Replace("&", "&");
t = t.Replace("<", "<");
output.WriteLine("<td>" + t + "</td>");
}
output.WriteLine("</tr>");
return true;
}
public override void Init(VariableBinding[] variables, bool distinct, bool ordered) {
output.WriteLine("<table>");
output.WriteLine("<tr>");
foreach (VariableBinding var in variables) {
if (var.Name == null) continue;
output.WriteLine("<th>" + var.Name + "</th>");
}
output.WriteLine("</tr>");
}
public override void Run(SelectableSource source, QueryResultSink resultsink) {
if (!(query is SelectQuery))
throw new InvalidOperationException("Only SELECT queries are supported by this method (" + query.GetType() + ").");
// Perform the query
SelectQuery squery = (SelectQuery)query;
RdfSourceWrapper sourcewrapper = new RdfSourceWrapper(source, QueryMeta, this);
MyLogicFactory logic = new MyLogicFactory();
foreach (RdfFunction f in extFunctions)
logic.registerExternalFunction(
new URIWrapper(f.Uri),
new ExtFuncWrapper(sourcewrapper, f));
squery.bindLogic(logic);
RdfBindingSet results;
try {
results = squery.execute(sourcewrapper);
} catch (java.lang.Exception e) {
throw new QueryExecutionException("Error executing query: " + e.Message, e);
}
// Prepare binding objects
java.util.List vars = results.getVariables();
VariableBinding[] bindings = new VariableBinding[vars.size()];
SparqlVariable[] svars = new SparqlVariable[vars.size()];
SemWebVariable[] vars2 = new SemWebVariable[vars.size()];
for (int i = 0; i < bindings.Length; i++) {
svars[i] = (SparqlVariable)vars.get(i);
vars2[i] = new SemWebVariable(svars[i].getName());
bindings[i] = new VariableBinding(vars2[i], null);
}
// Initialize the result sink
resultsink.Init(bindings, false, false); // set distinct and ordered
// Set the comments
resultsink.AddComments(queryString + "\n");
resultsink.AddComments(sourcewrapper.GetLog());
// Iterate the bindings
java.util.Iterator iter = results.iterator();
long ctr = -1, ctr2 = 0;
while (iter.hasNext()) {
RdfBindingRow row = (RdfBindingRow)iter.next();
// Since SPARQL processing may be lazy-delayed,
// add any new comments that might have been logged.
resultsink.AddComments(sourcewrapper.GetLog());
ctr++;
if (ctr < ReturnStart && ReturnStart != -1) continue;
for (int i = 0; i < bindings.Length; i++) {
Resource r = sourcewrapper.ToResource(row.getValue(svars[i]));
r = sourcewrapper.Persist(r);
bindings[i] = new VariableBinding(bindings[i].Variable, r);
}
resultsink.AddComments(sourcewrapper.GetLog());
resultsink.Add(bindings);
ctr2++;
if (ctr2 >= ReturnLimit && ReturnLimit != -1) break;
}
resultsink.AddComments(sourcewrapper.GetLog());
// Close the result sink.
resultsink.Finished();
}
public override void Run(SelectableSource source, QueryResultSink resultsink)
{
if (!(query is SelectQuery))
{
throw new InvalidOperationException("Only SELECT queries are supported by this method (" + query.GetType() + ").");
}
// Perform the query
SelectQuery squery = (SelectQuery)query;
RdfSourceWrapper sourcewrapper = new RdfSourceWrapper(source, QueryMeta, this);
MyLogicFactory logic = new MyLogicFactory();
foreach (RdfFunction f in extFunctions)
{
logic.registerExternalFunction(
new URIWrapper(f.Uri),
new ExtFuncWrapper(sourcewrapper, f));
}
squery.bindLogic(logic);
RdfBindingSet results;
try {
results = squery.execute(sourcewrapper);
} catch (java.lang.Exception e) {
throw new QueryExecutionException("Error executing query: " + e.Message, e);
}
// Prepare binding objects
java.util.List vars = results.getVariables();
VariableBinding[] bindings = new VariableBinding[vars.size()];
SparqlVariable[] svars = new SparqlVariable[vars.size()];
SemWebVariable[] vars2 = new SemWebVariable[vars.size()];
for (int i = 0; i < bindings.Length; i++)
{
svars[i] = (SparqlVariable)vars.get(i);
vars2[i] = new SemWebVariable(svars[i].getName());
bindings[i] = new VariableBinding(vars2[i], null);
}
// Initialize the result sink
resultsink.Init(bindings, false, false); // set distinct and ordered
// Set the comments
resultsink.AddComments(queryString + "\n");
resultsink.AddComments(sourcewrapper.GetLog());
// Iterate the bindings
java.util.Iterator iter = results.iterator();
long ctr = -1, ctr2 = 0;
while (iter.hasNext())
{
RdfBindingRow row = (RdfBindingRow)iter.next();
// Since SPARQL processing may be lazy-delayed,
// add any new comments that might have been logged.
resultsink.AddComments(sourcewrapper.GetLog());
ctr++;
if (ctr < ReturnStart && ReturnStart != -1)
{
continue;
}
for (int i = 0; i < bindings.Length; i++)
{
Resource r = sourcewrapper.ToResource(row.getValue(svars[i]));
r = sourcewrapper.Persist(r);
bindings[i] = new VariableBinding(bindings[i].Variable, r);
}
resultsink.AddComments(sourcewrapper.GetLog());
resultsink.Add(bindings);
ctr2++;
if (ctr2 >= ReturnLimit && ReturnLimit != -1)
{
break;
}
}
resultsink.AddComments(sourcewrapper.GetLog());
// Close the result sink.
resultsink.Finished();
}
public static Statement Substitute(VariableBinding[] variables, Statement template) {
// This may throw an InvalidCastException if a variable binds
// to a literal but was used as the subject, predicate, or meta
// of the template.
foreach (VariableBinding v in variables) {
if (v.Variable == template.Subject) template = new Statement((Entity)v.Target, template.Predicate, template.Object, template.Meta);
if (v.Variable == template.Predicate) template = new Statement(template.Subject, (Entity)v.Target, template.Object, template.Meta);
if (v.Variable == template.Object) template = new Statement(template.Subject, template.Predicate, v.Target, template.Meta);
if (v.Variable == template.Meta) template = new Statement(template.Subject, template.Predicate, template.Object, (Entity)v.Target);
}
return template;
}
public override bool Add(VariableBinding[] result) {
Bindings.Add(result.Clone());
return true;
}
public abstract bool Add(VariableBinding[] result);
public virtual void Init(VariableBinding[] variables, bool distinct, bool ordered) {
}
public override void Run(SelectableSource targetModel, QueryResultSink result) {
CheckInit();
foreach (Statement s in novariablestatements)
if (!targetModel.Contains(s))
return;
VariableBinding[] finalbindings = new VariableBinding[variables.Length];
for (int i = 0; i < variables.Length; i++)
finalbindings[i].Variable = variableEntities[i];
result.Init(finalbindings, true, false);
Debug("Begnning Query");
BindingSet bindings = new BindingSet(this);
for (int group = 0; group < statements.Length; group++) {
bool ret = Query(group, bindings, targetModel);
if (!ret) {
// A false return value indicates the query
// certainly failed -- a non-optional statement
// failed to match at all.
result.Finished();
return;
}
}
int ctr = -1;
foreach (QueryResult r in bindings.Results) {
Permutation permutation = new Permutation(r.Bindings);
do {
ctr++;
if (ctr < ReturnStart) continue;
for (int i = 0; i < variables.Length; i++)
finalbindings[i].Target = permutation[i];
result.Add(finalbindings);
if (ReturnLimit != -1 && ctr == ReturnStart+ReturnLimit) break;
} while (permutation.Next());
if (ReturnLimit != -1 && ctr == ReturnStart+ReturnLimit) break;
}
result.Finished();
}
public override void Run(SelectableSource targetModel, QueryResultSink result)
{
CheckInit();
foreach (Statement s in novariablestatements)
{
if (!targetModel.Contains(s))
{
return;
}
}
VariableBinding[] finalbindings = new VariableBinding[variables.Length];
for (int i = 0; i < variables.Length; i++)
{
finalbindings[i].Variable = variableEntities[i];
}
result.Init(finalbindings, true, false);
Debug("Begnning Query");
BindingSet bindings = new BindingSet(this);
for (int group = 0; group < statements.Length; group++)
{
bool ret = Query(group, bindings, targetModel);
if (!ret)
{
// A false return value indicates the query
// certainly failed -- a non-optional statement
// failed to match at all.
result.Finished();
return;
}
}
int ctr = -1;
foreach (QueryResult r in bindings.Results)
{
Permutation permutation = new Permutation(r.Bindings);
do
{
ctr++;
if (ctr < ReturnStart)
{
continue;
}
for (int i = 0; i < variables.Length; i++)
{
finalbindings[i].Target = permutation[i];
}
result.Add(finalbindings);
if (ReturnLimit != -1 && ctr == ReturnStart + ReturnLimit)
{
break;
}
} while (permutation.Next());
if (ReturnLimit != -1 && ctr == ReturnStart + ReturnLimit)
{
break;
}
}
result.Finished();
}
