Hi All,

I am trying to get the functionalty(What is the functionality for this batch class).Please someone help me understandig the below code

global class BatchCreateScheduleLineBySOItem implements Database.batchable<sObject>{

    global Database.QueryLocator start(Database.BatchableContext BC){
      List<User> users = [Select u.Id From User u where name=:ScheduleLineHelper.userIntegrationIservice];
      //return all SO Item that not yet have schedule line for all user execept user Integration i:service
      if(users.size()>0){
          String id=users.get(0).Id;
          return Database.getQueryLocator('select Id, Name, CurrencyIsoCode, Item_Qty__c, SalesOrderId__c, Confirmed_Delivery_Date__c,'+ 
            'RequestedDeliveryDate__c from SalesOrderItem__c where Id not in (select SalesItem__c from SalesItemDistribution__c) and CreatedById<>:id');
      }
      //return all SO Item that not yet have schedule line for all user
      return Database.getQueryLocator('select Id, Name, CurrencyIsoCode, Item_Qty__c, SalesOrderId__c, Confirmed_Delivery_Date__c,'+ 
            'RequestedDeliveryDate__c from SalesOrderItem__c where Id not in (select SalesItem__c from SalesItemDistribution__c)');
   }
   
   global void execute(Database.BatchableContext BC, List<sObject> scope){
        //create Schedule Line by all SO Item that not yet have Schedule Line 
        List<SalesItemDistribution__c> lstScl=new List<SalesItemDistribution__c>();
        for(Sobject so:scope){
            SalesOrderItem__c soitem=(SalesOrderItem__c)so;
            SalesItemDistribution__c sc=new SalesItemDistribution__c(Name=soitem.Name, CurrencyIsoCode=soitem.CurrencyIsoCode, 
                                        QuantityConfirmed__c=soitem.Item_Qty__c, SalesDoc__c=soitem.SalesOrderId__c, SalesItem__c=soitem.Id);
                                        
            sc.DateConfirmed__c=(soitem.Confirmed_Delivery_Date__c==null)?
                                soitem.RequestedDeliveryDate__c:soitem.Confirmed_Delivery_Date__c;
                                
            lstScl.add(sc);
            
        }
        insert lstScl;
    }

   global void finish(Database.BatchableContext BC){
   }
   
}

Thanks in Advance