How to use

SetMultimap

in

org.apache.jena.ext.com.google.common.collect

private void addToReverseMap(final Node p, final Node s, final Node oldValue, final Node value) {
  final SetMultimap<Node, Node> valueToSubjectMap = valueReverseIndex.get(p);
  if ( valueToSubjectMap == null )
    return ; 
  valueToSubjectMap.remove(oldValue, s);
  valueToSubjectMap.put(value, s);
}

@Override
public Collection<Row> getMatchingRows(Column column, Node value) {
  if (column == null || column.getColumnKey() == null)
    throw new NullPointerException("column is null");
  
  if (value == null)
    throw new NullPointerException("value is null");
  
  
  Node p = column.getColumnKey();
  final SetMultimap<Node, Node> valueToSubjectMap = valueReverseIndex.get(p);
  if ( valueToSubjectMap == null )
    return Collections.emptyList() ;
  final Set<Node> subjects = valueToSubjectMap.get(value);
  if ( subjects == null )
    return Collections.emptyList() ;
  final ArrayList<Row> matchingRows = new ArrayList<Row>();
  for (Node subject : subjects) {
    matchingRows.add(this.getRow(subject));
  }
  return matchingRows;
}

private void removeFromReverseMap(final Node p, final Node s,
    final Node value) {
  final SetMultimap<Node, Node> valueTokeysMap = valueReverseIndex.get(p);
  if ( valueTokeysMap == null )
    return ;
  valueTokeysMap.remove(s, value);
}

@Override
public ExtendedIterator<Triple> getTripleIterator(Column column, Node value) {
  
  // use POS index directly (fast)
  
  if (column == null || column.getColumnKey() == null)
    throw new NullPointerException("column is null");
  
  if (value == null)
    throw new NullPointerException("value is null");
  
  
  Node p = column.getColumnKey();
  final SetMultimap<Node, Node> valueToSubjectMap = valueReverseIndex.get(p);
  if ( valueToSubjectMap == null ) 
    return NullIterator.instance() ;
  final Set<Node> subjects = valueToSubjectMap.get(value);
  ArrayList<Triple> triples = new ArrayList<Triple>();
  for (Node subject : subjects) {
    triples.add(Triple.create(subject, p, value));
  }
  return WrappedIterator.create(triples.iterator());
}