package ch.claude_martin.foo;

import java.util.*;

public class SomeClass implements Comparable<SomeClass> {

	private static Comparator<SomeClass> COMPARATOR = Comparator.comparing(SomeClass::getCode).thenComparing(SomeClass::getName);
	
	private final String name, code;
	private final NavigableSet<SomeClass> children = new TreeSet<SomeClass>();
	private final SomeClass parent;

	// doesn't have to be public. only factory needs access.
	SomeClass(SomeClass parent, String name, String code) {
		this.parent = parent;
		this.name = name;
		this.code = code;

	}

	// Creates a root
	SomeClass(String name, String code) {
		this(null, name, code);
	}

	// doesn't have to be public. only factory needs access.
	void addChild(SomeClass child) {
		this.children.add(child);
	}

	public NavigableSet<SomeClass> getChildren() {
		return new TreeSet<>(this.children); // return defensive copy
	}

	public Optional<SomeClass> getParent() {
		return Optional.ofNullable(this.parent);
	}
	
	public String getName() {
		return name;
	}
	
	public String getCode() {
		return code;
	}

	@Override
	public int compareTo(SomeClass o) {
		return COMPARATOR.compare(this, o);
	}

}