private short getMurFinInfo(final int x, final int y) {
   if (this.m_murFinInfo == null) {
     return TopologyMapPatch.PROPERTIES_CELLS_DATA.getDefaultValue();
   }
   return TopologyMapPatch.PROPERTIES_CELLS_DATA.getValue(
       x - this.m_x, y - this.m_y, 0, this.m_murFinInfo);
 }
 private short getMiscProperties(final int x, final int y) {
   if (this.m_miscProperties == null) {
     return TopologyMapPatch.PROPERTIES_CELLS_DATA.getDefaultValue();
   }
   return TopologyMapPatch.PROPERTIES_CELLS_DATA.getValue(
       x - this.m_x, y - this.m_y, 0, this.m_miscProperties);
 }