public static Multimap<String, String> includeFromKeysWhitelist(
Multimap<String, String> records, Collection<String> keysWhitelist) {
Check.notNull(records, "records");
Check.notNull(keysWhitelist, "keysWhitelist");
Multimap<String, String> result = Multimaps.filterKeys(records, Predicates.in(keysWhitelist));
return result;
}
public static final void strictlyPositive(Long number, String argName) {
Check.notNull(number, argName);
if (number.intValue() < 1) {
rejectEmptyParam(argName);
}
}
public static final void notEmpty(Map<?, ?> obj, String argName) {
Check.notNull(obj, argName);
if (obj.keySet().isEmpty()) {
rejectEmptyParam(argName);
}
}
public static final void notEmpty(Long[] obj, String argName) {
Check.notNull(obj, argName);
if (obj.length <= 0) {
rejectEmptyParam(argName);
}
}
public static final void notEmpty(Collection<?> coll, String argName) {
Check.notNull(coll, argName);
if (coll.size() < 1) {
rejectEmptyParam(argName);
}
}
public static final void notEmpty(String obj, String argName) {
Check.notNull(obj, argName);
if (obj.trim().length() == 0) {
rejectEmptyParam(argName);
}
}
public static Multimap<String, String> invertKeyValues(Multimap<String, String> multimap) {
Check.notNull(multimap, "multimap");
Multimap<String, String> result = HashMultimap.create();
Multimaps.invertFrom(multimap, result);
return result;
}
public static Multimap<String, String> forMap(Map<String, Collection<String>> map) {
Check.notNull(map, "map");
Multimap<String, String> result = HashMultimap.create();
for (String key : map.keySet()) {
result.putAll(key, map.get(key));
}
return result;
}
public static Collection<List<String>> pairAndFlatten(Multimap<String, String> multimap) {
Check.notNull(multimap, "multimap");
// for each key, create a new pairs based on the key + each value for that key
// (kind of a narrower cartesian product of the multimap's keys and its values)
Multimap<String, List<String>> listsOfPairsIndexedByTag =
Multimaps.transformEntries(multimap, FunctionsUtil.asTuplesMultimap);
// TODO: these tuples really should be proper DTOs
LOG.trace(
"listsOfPairsIndexedByTag: {} - {}",
listsOfPairsIndexedByTag.size(),
listsOfPairsIndexedByTag);
// the final result is a list of Tuples (or DTOs) - ie. the flat multimap's values
Collection<List<String>> result = listsOfPairsIndexedByTag.values();
LOG.trace("result: {} - {}", result.size(), result);
return result;
}