CompactNsContext.java 文件源码

@Override
public Iterator<Namespace> getNamespaces()
{
    if (mNsList == null) {
        int firstLocal = mFirstLocalNs;
        int len = mNsLength - firstLocal;
        if (len == 0) { // can this happen?
            return DataUtil.emptyIterator();
        }
        if (len == 2) { // only one NS
            return DataUtil.<Namespace>singletonIterator(NamespaceEventImpl.constructNamespace
                    (mLocation,
                            mNamespaces[firstLocal],
                            mNamespaces[firstLocal+1]));
        }
        ArrayList<Namespace> l = new ArrayList<Namespace>(len >> 1);
        String[] ns = mNamespaces;
        for (len = mNsLength; firstLocal < len;
             firstLocal += 2) {
            l.add(NamespaceEventImpl.constructNamespace(mLocation, ns[firstLocal],
                                          ns[firstLocal+1]));
        }
        mNsList = l;
    }
    return mNsList.iterator();
}