private RDFRectangle toRectangle(StatementPattern pattern, BindingSet bindings) {
Value sVal = pattern.getSubjectVar().getValue();
Value pVal = pattern.getPredicateVar().getValue();
Value oVal = pattern.getObjectVar().getValue();
RDFURIRange subjectRange;
List<String> list = new ArrayList<String>();
if (sVal == null) {
if (bindings.hasBinding(pattern.getSubjectVar().getName()))
list.add(bindings.getValue(pattern.getSubjectVar().getName()).stringValue());
} else list.add(sVal.stringValue());
if (!list.isEmpty()) subjectRange = new RDFURIRange(list);
else subjectRange = new RDFURIRange();
ExplicitSetRange<URI> predicateRange;
Set<URI> set = new HashSet<URI>();
if (pVal == null) {
if (bindings.hasBinding(pattern.getPredicateVar().getName()))
set.add((URI) bindings.getValue(pattern.getPredicateVar().getName()));
} else set.add((URI) pVal);
if (!set.isEmpty()) predicateRange = new ExplicitSetRange<URI>(set);
else predicateRange = new ExplicitSetRange<>();
RDFValueRange objectRange = new RDFValueRange();
if (oVal == null) {
if (bindings.hasBinding(pattern.getObjectVar().getName()))
objectRange = fillObjectRange(bindings.getValue(pattern.getObjectVar().getName()));
} else objectRange = fillObjectRange(oVal);
return new RDFRectangle(subjectRange, predicateRange, objectRange);
}
@Override
public void meet(Count node) throws RuntimeException {
builder.append("COUNT(");
if (node.isDistinct()) {
builder.append("DISTINCT ");
}
if (node.getArg() == null) {
// this is a weird special case where we need to expand to all variables selected in the query
// wrapped
// by the group; we cannot simply use "*" because the concept of variables is a different one
// in SQL,
// so instead we construct an ARRAY of the bindings of all variables
List<String> countVariables = new ArrayList<>();
for (SQLVariable v : parent.getVariables().values()) {
if (v.getProjectionType() == ValueType.NONE) {
Preconditions.checkState(
v.getExpressions().size() > 0, "no expressions available for variable");
countVariables.add(v.getExpressions().get(0));
}
}
builder.append("ARRAY[");
Joiner.on(',').appendTo(builder, countVariables);
builder.append("]");
} else {
optypes.push(ValueType.NODE);
node.getArg().visit(this);
optypes.pop();
}
builder.append(")");
}
