SOFTUO_SettingsNodeCollection

package x39.Settings;

import java.util.ArrayList;
import java.util.List;

public class SOFTUO_SettingsNodeCollection {

    private int _validIndex;
    private int _actualIndex;
    private List<SettingsNode> _list;

    protected SOFTUO_SettingsNodeCollection(){
        _validIndex = -1;
        _actualIndex = -1;
        _list = new ArrayList<SettingsNode>();

    }

    public void up(int i){
        _actualIndex -= i;
        if(_actualIndex < 0 || i < 0)
            _actualIndex = 0;
    }
    public void up(){up(1);}
    public void down(SettingsNode node){
        if(_validIndex > -1)
            _list.get(_actualIndex).addChild(node);
        _actualIndex++;
        _validIndex = _actualIndex;
        if(_list.size() < _validIndex + 1)
            _list.add(node);
        else
            _list.set(_actualIndex, node);
    }
    public boolean down(){
        if(_actualIndex == _validIndex)
            return false;
        _actualIndex--;
        return true;
    }

    public SettingsNode getNode(){
        if(_validIndex <= -1)
            return null;
        return _list.get(_actualIndex);
    }


}