code: public
    Object getExprValue(int id){
  
     if (tc.isEntryEnabled())
        tc.entry(this,cclass, "getExprValue", "id: " + new Integer(id));
      Object result = null;
      if (cacheTag[id] == generation)
        result = cacheValue[id];
  
      if (tc.isEntryEnabled())
  	  tc.exit(this,cclass, "getExprValue","result: " + result);
      return result;
    }
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