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Link Intersystems Commons Graph (lis-commons-graph) is a collection of reusable software components that provide support for graph and tree related programming tasks, such as models and search algorithms.

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package com.link_intersystems.graph.tree;

import java.util.stream.Stream;

/**
 * A {@link TreeModel} describes a tree structure on objects.
 *
 * @author René Link {@literal }
 */
public interface TreeModel {

    /**
     * An object that can be used as a root object in case you don't have one.
     */
    public static final Object DEFAULT_ROOT = new Object();

    Stream getChildren(T parent);

    default  boolean hasChildren(P parent) {
        return getChildren(parent).findFirst().isPresent();
    }
}