package bjc.utils.gui.browser;

/** Data model for JBrowser (hierarchical, like TreeModel but simpler). */
public interface JBrowserModel {
	Object getRoot();

	int getChildCount(Object parent);

	Object getChild(Object parent, int index);

	default int indexOfChild(Object parent, Object child) {
		int n = getChildCount(parent);
		for (int i = 0; i < n; i++)
			if (getChild(parent, i).equals(child))
				return i;
		return -1;
	}

	boolean isLeaf(Object node);

	/** Display text for nodes (used by default renderer & default filter). */
	default String getText(Object node) {
		return String.valueOf(node);
	}

	/** True if node can expand (used by default renderer). */
	default boolean isExpandable(Object node) {
		return !isLeaf(node);
	}

	/** Header text for the column that is showing the children of parentNode. */
	default String getColumnHeader(Object parentNode, int depthFromRoot) {
		String t = getText(parentNode);
		return (t == null || t.isEmpty()) ? "(root)" : t;
	}
}