/** {@inheritDoc} */
@Override
public QueryResult deleteQueryResult(final QueryResult queryResult, final int operandID) {
final Iterator<Bindings> itb = queryResult.oneTimeIterator();
while (itb.hasNext()) {
this.bindings.remove(itb.next());
}
return null;
}
/** {@inheritDoc} */
@Override
public QueryResult deleteQueryResult(final QueryResult queryResult, final int operandID) {
// problem: it does not count the number of occurrences of a binding
// i.e. { ?a=<a> }, { ?a=<a> } and delete { ?a=<a> } will result in
// {} instead of { ?a=<a> }!!!!!!
final Iterator<Bindings> itb = queryResult.oneTimeIterator();
while (itb.hasNext()) {
this.bindings.remove(itb.next());
}
return null;
}
/** {@inheritDoc} */
@Override
public QueryResult process(final QueryResult _bindings, final int operandID) {
final Iterator<Bindings> itb = _bindings.oneTimeIterator();
if (!itb.hasNext()) {
return null;
} else {
return QueryResult.createInstance(
new ImmutableIterator<Bindings>() {
Bindings next = null;
@Override
public boolean hasNext() {
if (this.next != null) {
return true;
}
if (itb.hasNext()) {
this.next = this.next();
if (this.next != null) {
return true;
}
}
return false;
}
@Override
public Bindings next() {
if (this.next != null) {
final Bindings znext = this.next;
this.next = null;
return znext;
}
while (itb.hasNext()) {
final Bindings b = itb.next();
if (!NonBlockingDistinct.this.bindings.contains(b)) {
NonBlockingDistinct.this.bindings.add(b);
return b;
}
}
return null;
}
});
}
}