Examples with IterOfOne org.sbpax.util.iterators.IterOfOne used on opensource projects

Example 1 with IterOfOne

use of org.sbpax.util.iterators.IterOfOne in project vcell by virtualcell.

the class IndexedGraph method match.

public Iterator<Statement> match(Resource subject, URI predicate, Value object, Resource... contexts) {
    Iterator<Statement> iterator = new RDFGraphMatchIterator(this, subject, predicate, object);
    if (subject != null) {
        if (predicate != null) {
            if (object != null) {
                Statement statement = getValueFactory().createStatement(subject, predicate, object);
                if (statements.contains(statement)) {
                    iterator = new IndexedGraphIterator(this, new IterOfOne<Statement>(statement));
                } else {
                    iterator = new IterOfNone<Statement>();
                }
            } else {
                Set<Statement> matches = spMap.get(new ListOfTwo<Value>(subject, predicate));
                iterator = matches != null ? new IndexedGraphIterator(this, matches.iterator()) : new IterOfNone<Statement>();
            }
        } else {
            if (object != null) {
                Set<Statement> matches = soMap.get(new ListOfTwo<Value>(subject, object));
                iterator = matches != null ? new IndexedGraphIterator(this, matches.iterator()) : new IterOfNone<Statement>();
            } else {
                Set<Statement> matches = sMap.get(subject);
                iterator = matches != null ? new IndexedGraphIterator(this, matches.iterator()) : new IterOfNone<Statement>();
            }
        }
    } else {
        if (predicate != null) {
            if (object != null) {
                Set<Statement> matches = poMap.get(new ListOfTwo<Value>(predicate, object));
                iterator = matches != null ? new IndexedGraphIterator(this, matches.iterator()) : new IterOfNone<Statement>();
            } else {
                Set<Statement> matches = pMap.get(predicate);
                iterator = matches != null ? new IndexedGraphIterator(this, matches.iterator()) : new IterOfNone<Statement>();
            }
        } else {
            if (object != null) {
                Set<Statement> matches = oMap.get(object);
                iterator = matches != null ? new IndexedGraphIterator(this, matches.iterator()) : new IterOfNone<Statement>();
            } else {
                iterator = new IndexedGraphIterator(this, statements.iterator());
            }
        }
    }
    return iterator;
}