@Override
public TagsList clone() {
TagsList replicant = new TagsList();
Iterator<QueryTag> tagsIter = tags.iterator();
while (tagsIter.hasNext()) {
QueryTag sourceElement = tagsIter.next();
replicant.append(new QueryTag(sourceElement.getTagText(), sourceElement.getTagWeight()));
}
return replicant;
}
/**
* Normalizes tags list via removing tags with zero weight, deleting duplicates and converting
* tags text to lower case.
*/
public QueryTag[] getNormalizedTagsArray() {
Map<String, Boolean> seen = new HashMap<>();
List<QueryTag> normalizedTagsList = new ArrayList<>(tags.size());
ListIterator<QueryTag> iterator = tags.listIterator(tags.size());
while (iterator.hasPrevious()) {
QueryTag t = iterator.previous();
String lowerTagText = t.getTagText().toLowerCase();
if (t.getTagWeight() != 0 && seen.putIfAbsent(lowerTagText, Boolean.TRUE) == null) {
normalizedTagsList.add(t);
}
}
return normalizedTagsList.toArray(new QueryTag[normalizedTagsList.size()]);
}
/**
* Calculates hash for storing in database and determining uniqueness.
*
* @return the calculated hash
*/
public static long calculateHash(QueryTag[] tagsArray) {
long hash = 1;
for (QueryTag t : tagsArray) hash = 31 * hash + t.hashCode();
return hash;
}
/**
* Calculates hash for storing in database and determining uniqueness.
*
* @return the calculated hash
*/
public long calculateHash() {
long hash = 1;
for (QueryTag t : tags) hash = 31 * hash + t.hashCode();
return hash;
}
