package com.bernard.nodecames.util;

import java.util.EnumSet;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collector;

import tools.jackson.databind.JsonNode;
import tools.jackson.databind.node.ArrayNode;
import tools.jackson.databind.node.JsonNodeFactory;

public class Utils {

    private Utils() {}

    public static final Collector<JsonNode,ArrayNode,ArrayNode> jsonNodeCollector(JsonNodeFactory jsn) {
        return new Collector<JsonNode,ArrayNode,ArrayNode>() {
            @Override
            public Supplier<ArrayNode> supplier() {
                return jsn::arrayNode;
            }
            @Override
            public BiConsumer<ArrayNode, JsonNode> accumulator() {
                return ArrayNode::add;
            }
            @Override
            public BinaryOperator<ArrayNode> combiner() {
                return (a,b) -> {
                    a.addAll(b);
                    return a;
                };
            }
            @Override
            public Function<ArrayNode, ArrayNode> finisher() {
                return Function.identity();
            }
            @Override
            public Set<Characteristics> characteristics() {
                return EnumSet.of(Characteristics.IDENTITY_FINISH);
            }
        };
    }

}