I have question on ORM. I have two tables and want to create one object- java class based on them. I have specific requirement to write class in below fashion.

Table: ComputerFranchise
Fields:
id - number (primary key)
address - varchar2


ComputerType
Fields:
computerName: varchar2
compFranchiseId: number (foreign key referencing to id of computerFranchise)
dailySales: number



Based on above tables i want to create single java class with below fileds and methods.

@Entity
public class ComputerFranchise
{

@Id
int id;
public int getId(){..}
public void setId(int id){..}

@Column
String address;
public String getAddress(){}
public void setAddress(String add){..}


HashMap dailysales<String,Integer> - This is hashmap of computertype mapped to thier daily sales per franchise, and should be sorted by computername. What annotations should i use to create this hashmap and here real question is i don's want to create javaclass for ComputerType?
Should i use secondary table concept or should i use read only query or is there better to create this field?

public HashMap getDailySales()
{
..
}

public void setDailySales(HashMap map)
{
...
}

}


So question is best way to create dailysales hasmap filed and operation on it. How should i map this filed to table and what annotations should i use?

Thanks in advance for any suggestions/pointers.