Ufdjrw

I am new in Java and I am going to write a Java program to model some kind of Bill of Materials. A Bill of Material will contain a name, and a list of another bill of materials. This is my BOM model:

public class BOM 
 private String name;
 private List<BOM> childBOMs;

 public BOM(String name, List<BOM> childBOMs) 
 this.name = name;
 childBOMs = childBOMs;
 

 // getter setter

In the program, I have a map to hold all the bill of materials that I have created:

 private Map<String, BOM> bomMap;
 private List<BOM> boms;

 private void createBOM(String bomName, List<BOM> childBOMs) 
 if (!bomMap.containsKey(bomName)) 
 bomMap.put(bomName, new BOM(bomName, childBOMs));
 else 
 System.out.println("A BOM with the same name is already put in the system");
 
 

Now let's say I create two BOMs:

- BOM1
 + CBOM1
 + CBOM2

- CBOM1
 + CCBOM1

Now in the map I should have two BOMs: BOM1 and CBOM1. Now is my question how can I link the CBOM1 object that I just created to the CBOM1 that in the BOM1 object, so that the BOM1 and my bomMap will become something like:

- BOM1
 + CBOM1
 + CCBOM1
 + CBOM2

- CBOM1
 + CCBOM1

Of course I can do directly like bom1.getChildBOMs().get(0).setChildBOMs(cBOM1.getChildBOMs()) but I want to ask if there is any generic solution here do to this, because I can image that if I have a hundread of BOMs in the system and each of them have some child BOMs and each of child BOMs have some child-child-BOMs, it would be very difficult to handle all. Can someone give me some hint here? Thanks!