protected AbstractIterHashJoin(
JoinKey joinKey,
QueryIterator probeIter,
QueryIterator streamIter,
ExecutionContext execCxt) {
super(probeIter, streamIter, execCxt);
if (joinKey == null) {
QueryIterPeek pProbe = QueryIterPeek.create(probeIter, execCxt);
QueryIterPeek pStream = QueryIterPeek.create(streamIter, execCxt);
Binding bLeft = pProbe.peek();
Binding bRight = pStream.peek();
List<Var> varsLeft = Iter.toList(bLeft.vars());
List<Var> varsRight = Iter.toList(bRight.vars());
joinKey = JoinKey.createVarKey(varsLeft, varsRight);
probeIter = pProbe;
streamIter = pStream;
}
this.joinKey = joinKey;
this.iterStream = streamIter;
this.hashTable = new HashProbeTable(joinKey);
this.iterCurrent = null;
buildHashTable(probeIter);
}
private Triple resolveTriple(final Triple t, final Binding values) {
int idx = variables.indexOf(t.getSubject());
final Node s = idx == -1 ? t.getSubject() : values.get(Var.alloc(variables.get(idx)));
idx = variables.indexOf(t.getPredicate());
final Node p = idx == -1 ? t.getPredicate() : values.get(Var.alloc(variables.get(idx)));
idx = variables.indexOf(t.getObject());
final Node o = idx == -1 ? t.getObject() : values.get(Var.alloc(variables.get(idx)));
return new Triple(s, p, o);
}
private List<Var> calcVars() {
List<Var> vars = new ArrayList<>(4);
// Only if not in parent.
// A (var/value) binding may have been copied down to record it's NodeId.
Binding b = idBinding.getParentBinding();
Iterator<Var> iter = idBinding.iterator();
for (Var v : idBinding) {
if (b == null || !b.contains(v)) vars.add(v);
}
return vars;
}
private static NodeValue evalOrElse(
Expr expr, Binding binding, FunctionEnv functionEnv, NodeValue exceptionValue) {
// Exceptions in java are expensive if the stack information is
// collected which is the default behaviour. The expensive step is
// Throwable.fillInStackTrace.
//
// Otherwise, they are reasonable cheap. It needs special exceptions
// which overrides fillInStackTrace to be cheap but they loose the
// general information for development.
//
// Instead, pick out specal cases, the expression being a single variable
// being the important one.
//
// BOUND(?x) is a important case where the expression is often an exception
// in general evaluation. See E_Bound - different exception handling
// (it handles VariableNotBoundException not a general ExprEvalException).
if (expr.isConstant())
// Easy case.
return expr.getConstant();
if (expr.isVariable()) {
// The case of the expr being a single variable.
Var v = expr.asVar();
Node n = binding.get(v);
if (n == null) return exceptionValue;
NodeValue nv = NodeValue.makeNode(n);
return nv;
}
try {
return expr.eval(binding, functionEnv);
} catch (ExprEvalException ex) {
return exceptionValue;
}
}
private ResultSet ConvertResults(org.apache.jena.query.ResultSet results) {
ResultSet rs = new ResultSet();
while (results.hasNext()) {
Binding b = results.nextBinding();
Result result = new Result();
Iterator<Var> v = b.vars();
while (v.hasNext()) {
Var currentV = v.next();
Node val = b.get(currentV);
if (currentV.toString().contains("_info_")) {
String[] parts = val.getLiteral().getLexicalForm().toString().split("=");
if (parts.length > 1) {
for (int i = 0; i < parts.length; i++) {
String[] subParts = parts[i].split("\\.");
if (subParts.length > 1) {
if (!Character.isDigit(subParts[1].charAt(0))) result.addTable(subParts[0]);
}
}
}
result.addWhere(val.getLiteral().getLexicalForm());
} else {
if (val.isLiteral()) {
String value = val.getLiteral().getLexicalForm();
String datatype = val.getLiteralDatatypeURI();
if (datatype.equals(S2SML.LITERAL_MAP_IRI)) {
String[] parts = value.split("\\.");
if (parts.length > 1) {
if (!Character.isDigit(parts[1].charAt(0))) result.addTable(parts[0]);
}
}
}
// System.out.println(currentV.toString().replace("?", "") +" "+val);
result.addVarMapping(
currentV.toString().replace("?", ""), FormatUtil.processNode(val, dialect));
}
}
rs.add(result);
}
return rs;
}
