public void setOffsetInSource(int addr, int v) {
        if (featOkTst && casFeat_offsetInSource == null)
      jcas.throwFeatMissing("offsetInSource", "edu.lti.cmu.hw1.typesys.SourceDocInfo");
    ll_cas.ll_setIntValue(addr, casFeatCode_offsetInSource, v);}