DataMerger.java 文件源码

/**
 * Returns a map of the data items.
 * @return a map of items.
 *
 * @see DataMap
 */
@NonNull
@Override
public ListMultimap<String, I> getDataMap() {
    // put all the sets in a multimap. The result is that for each key,
    // there is a sorted list of items from all the layers, including removed ones.
    ListMultimap<String, I> fullItemMultimap = ArrayListMultimap.create();

    for (S resourceSet : mDataSets) {
        ListMultimap<String, I> map = resourceSet.getDataMap();
        for (Map.Entry<String, Collection<I>> entry : map.asMap().entrySet()) {
            fullItemMultimap.putAll(entry.getKey(), entry.getValue());
        }
    }

    return fullItemMultimap;
}