import java.util.ArrayList;
import java.util.Collection;

public class MutableNode<T extends Number> implements Node<T> {

    T value;
    MutableNode<T> parent;
    Collection<Node<T>> children;

    public MutableNode(T value, MutableNode<T> parent, Collection<Node<T>> children) {
        this.value = value;
        this.parent = parent;
        this.children = new ArrayList<>();
    }

    void setValue(T value) {
        this.value = value;
    }

    void setParent(MutableNode<T> parent) {
        this.parent = parent;
    }

    void setChildren(Collection<MutableNode<T>> children) {
        for (int i = 0; i < children.size(); i++) {
            this.addChild((MutableNode<T>) children.toArray()[i]);
        }
    }

    void addChild(MutableNode<T> child) {
        this.children.add(child);
    }

    void removeChild(MutableNode<T> child) {
        if (parent != null) {
            parent.children.remove(child);
        }
        //else {
            //throw new Exception("Delete all tree");
        //}
    }

    @Override
    public Node<T> getParent() {
        return this.parent;
    }

    @Override
    public Collection<Node<T>> getChildren() {
        return this.children;
    }

    @Override
    public void print(int indents) {
        System.out.println(' ' * indents);
        System.out.println(value.toString());
    }
}