code: public String findUriByPrefix(String prefix)
      {
          /* This is quite simple: just need to locate the last mapping
           * for the prefix, if any:
           */
          String[] strs = mNsStrings;
          int phash = prefix.hashCode();
  
          for (int ix = mScopeEnd - 2; ix >= 0; ix -= 2) {
              String thisP = strs[ix];
              if (thisP == prefix ||
                  (thisP.hashCode() == phash && thisP.equals(prefix))) {
                  return strs[ix+1];
              }
          }
          return null;
      }
docs: /*
  /////////////////////////////////////////////
  Public API, accessors
  /////////////////////////////////////////////