How to use

getFactory

method

in

org.apache.lucene.search.SortField

public QueryResultKey(Query query, List<Query> filters, Sort sort, int nc_flags) {
 this.query = query;
 this.sort = sort;
 this.filters = filters;
 this.nc_flags = nc_flags;
 int h = query.hashCode();
 if (filters != null) h ^= filters.hashCode();
 sfields = (this.sort !=null) ? this.sort.getSort() : defaultSort;
 for (SortField sf : sfields) {
  // mix the bits so that sortFields are position dependent
  // so that a,b won't hash to the same value as b,a
  h ^= (h << 8) | (h >>> 25);   // reversible hash
  if (sf.getField() != null) h += sf.getField().hashCode();
  h += sf.getType();
  if (sf.getReverse()) h=~h;
  if (sf.getLocale()!=null) h+=sf.getLocale().hashCode();
  if (sf.getFactory()!=null) h+=sf.getFactory().hashCode();
 }
 hc = h;
}

public boolean equals(Object o) {
 if (o==this) return true;
 if (!(o instanceof QueryResultKey)) return false;
 QueryResultKey other = (QueryResultKey)o;
 // fast check of the whole hash code... most hash tables will only use
 // some of the bits, so if this is a hash collision, it's still likely
 // that the full cached hash code will be different.
 if (this.hc != other.hc) return false;
 // check for the thing most likely to be different (and the fastest things)
 // first.
 if (this.sfields.length != other.sfields.length) return false;
 if (!this.query.equals(other.query)) return false;
 if (!isEqual(this.filters, other.filters)) return false;
 for (int i=0; i<sfields.length; i++) {
  SortField sf1 = this.sfields[i];
  SortField sf2 = other.sfields[i];
  if (sf1.getType() != sf2.getType()) return false;
  if (sf1.getReverse() != sf2.getReverse()) return false;
  if (!isEqual(sf1.getField(),sf2.getField())) return false;
  if (!isEqual(sf1.getLocale(), sf2.getLocale())) return false;
  if (!isEqual(sf1.getFactory(), sf2.getFactory())) return false;
  // NOTE: the factory must be identical!!! use singletons!
 }
 return true;
}

/**
 * Creates a hit queue sorted by the given list of fields.
 * @param reader  Index to use.
 * @param fields Field names, in priority order (highest priority first).  Cannot be <code>null</code> or empty.
 * @param size  The number of hits to retain.  Must be greater than zero.
 * @throws IOException
 */
FieldSortedHitQueue (IndexReader reader, SortField[] fields, int size)
throws IOException {
 final int n = fields.length;
 comparators = new ScoreDocComparator[n];
 this.fields = new SortField[n];
 for (int i=0; i<n; ++i) {
  String fieldname = fields[i].getField();
  comparators[i] = getCachedComparator (reader, fieldname, fields[i].getType(), fields[i].getLocale(), fields[i].getFactory());
  this.fields[i] = new SortField (fieldname, comparators[i].sortType(), fields[i].getReverse());
 }
 initialize (size);
}

/**
 * Creates a hit queue sorted by the given list of fields.
 * @param reader  Index to use.
 * @param fields Fieldable names, in priority order (highest priority first).  Cannot be <code>null</code> or empty.
 * @param size  The number of hits to retain.  Must be greater than zero.
 * @throws IOException
 */
public FieldSortedHitQueue (IndexReader reader, SortField[] fields, int size)
throws IOException {
 final int n = fields.length;
 comparators = new ScoreDocComparator[n];
 this.fields = new SortField[n];
 for (int i=0; i<n; ++i) {
  String fieldname = fields[i].getField();
  comparators[i] = getCachedComparator (reader, fieldname, fields[i].getType(), fields[i].getLocale(), fields[i].getFactory());
  
  if (comparators[i].sortType() == SortField.STRING) {
    this.fields[i] = new SortField (fieldname, fields[i].getLocale(), fields[i].getReverse());
  } else {
    this.fields[i] = new SortField (fieldname, comparators[i].sortType(), fields[i].getReverse());
  }
 }
 initialize (size);
}

/**
 * Creates a hit queue sorted by the given list of fields.
 * @param reader  Index to use.
 * @param fields Fieldable names, in priority order (highest priority first).  Cannot be <code>null</code> or empty.
 * @param size  The number of hits to retain.  Must be greater than zero.
 * @throws IOException
 */
public FieldSortedHitQueue (IndexReader reader, SortField[] fields, int size)
throws IOException {
 final int n = fields.length;
 comparators = new ScoreDocComparator[n];
 this.fields = new SortField[n];
 for (int i=0; i<n; ++i) {
  String fieldname = fields[i].getField();
  comparators[i] = getCachedComparator (reader, fieldname, fields[i].getType(), fields[i].getLocale(), fields[i].getFactory());
  
  if (comparators[i].sortType() == SortField.STRING) {
    this.fields[i] = new SortField (fieldname, fields[i].getLocale(), fields[i].getReverse());
  } else {
    this.fields[i] = new SortField (fieldname, comparators[i].sortType(), fields[i].getReverse());
  }
 }
 initialize (size);
}