public Collection<V> getValues() {
        if (mValues == null) {
            mValues = new ValuesCollection();
        }
        return mValues;
    }
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