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Non-intrusive JDBC library supporting lambdas

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package com.codurance.lightaccess.mapping;

import java.util.*;
import java.util.function.BiFunction;

import static org.apache.commons.lang3.builder.EqualsBuilder.reflectionEquals;

public class OneToMany {

    private Map> data = new HashMap<>();

    public void put(KeyValue> keyValue) {
        if (keyValue.getValue().isPresent()) {
            this.put(keyValue.getKey(), keyValue.getValue());
        } else {
            this.put(keyValue.getKey(), Optional.empty());
        }
    }

    public void put(K key, Optional value) {
        List children = data.getOrDefault(key, new ArrayList<>());
        value.ifPresent(children::add);
        data.put(key, children);
    }

    public  List collect(BiFunction, T> collect) {
        List list = new ArrayList<>();
        data.forEach((key, value) -> list.add(collect.apply(key, value)));
        return list;
    }

    @Override
    public boolean equals(Object other) {
        return reflectionEquals(this, other);
    }

    @Override
    public String toString() {
        return "OneToMany{" +
                "data=" + data +
                '}';
    }
}