import java.util.Set;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.SetMultimap;
public class ManyToMany<K, V> {
private final SetMultimap<K, V> keysToValues = HashMultimap.create();
private final SetMultimap<V, K> valuesToKeys = HashMultimap.create();
public Set<V> getValues(K key) {
return keysToValues.get(key);
}
public Set<K> getKeys(V value) {
return valuesToKeys.get(value);
}
public boolean put(K key, V value) {
return keysToValues.put(key, value) && valuesToKeys.put(value, key);
}
public boolean putAll(K key, Iterable<? extends V> values) {
boolean changed = false;
for (V value : values) {
changed |= put(key, value);
}
return changed;
}
}
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