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Fn is a lazy Java Library that helps utilize some rudimentary functional concepts with more nounular objects

There is a newer version: 3.0.4

package com.iodesystems.fn.tree.simple;

import com.iodesystems.fn.logic.Condition;
import com.iodesystems.fn.Fn;
import com.iodesystems.fn.logic.Where;
import com.iodesystems.fn.tree.Adapter;

import java.util.Arrays;
import java.util.List;

public class Node {
    public static final Adapter Adapter = new NodeAdapter();
    protected final List children;
    private final Object value;

    public Node(Object value, Node... children) {
        this(value, Arrays.asList(children));
    }

    public Node(Object value, List children) {
        this.children = children;
        this.value = value;
    }

    public static Node v(Object value, List children) {
        return new Node(value, children);
    }

    public static Node v(Object value, Node... children) {
        return new Node(value, children);
    }

    public static Where valueIs(final Object value) {
        return new Condition() {
            @Override
            public boolean is(Node node) {
                return Fn.eq(value, node.getValue());
            }
        };
    }

    public List getChildren() {
        return children;
    }

    public Object getValue() {
        return value;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Node node = (Node) o;

        if (children != null ? !children.equals(node.children) : node.children != null) return false;
        return value != null ? value.equals(node.value) : node.value == null;

    }

    @Override
    public int hashCode() {
        int result = children != null ? children.hashCode() : 0;
        result = 31 * result + (value != null ? value.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        if (!children.isEmpty()) {
            StringBuilder childString = new StringBuilder();
            for (Node child : children) {
                childString.append(", ");
                childString.append(child);
            }
            return "v(" + value + childString.toString() + ")";
        } else {
            return "v(" + value + ")";
        }
    }
}