/**
* Merges two categories.
*
* @param a first category to be merged.
* @param b second category to be merged.
* @return result of merge - category as or null (if merge failed).
*/
public static Category merge(Category a, Category b) {
Category category = null;
try {
category = new Category(a.getKeyWords().get(0));
category.setKeyWords(a.getKeyWords());
category.getKeyWords().addAll(b.getKeyWords());
category.frequency += b.getFrequency();
category.refresh();
} catch (Exception ex) {
LOGGER.error(ex.getMessage(), ex);
}
return category;
}
/**
* Merges all categories in list. Use it for large amount of data, due to refresh of the result
* category will be in the end.
*
* @param categories list of all categories to be merged.
* @return new category.
*/
public static Category mergeAll(List<Category> categories) {
Category category = null;
try {
for (Category c : categories) {
if (category != null) {
category.getKeyWords().addAll(c.getKeyWords());
category.frequency += c.getFrequency();
} else {
category = new Category(c.getKeyWords().get(0));
category.setKeyWords(c.getKeyWords());
}
}
category.refresh();
} catch (Exception ex) {
LOGGER.error(ex.getMessage(), ex);
}
return category;
}