public Set<Map.Entry<K, V>> getEntrySet() {
        if (mEntrySet == null) {
            mEntrySet = new EntrySet();
        }
        return mEntrySet;
    }
Helper for writing standard Java collection interfaces to a data
structure like {@link ArrayMap}.

@author RePlugin Team
replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/replugin/utils/basic/MapCollections.java