/guava/guava/src/com/google/common/collect/AbstractMapBasedMultimap.java
if ( collection == this) {
if ( collection == null ) {
} else { return false; } } private Collection<V> getOrCreateCollection(@ParametricNullness K key) { Collection<V> collection = map.get(key); <extra_id_0> collection = createCollection(key); map.put(key, collection); } return collection; } @Override