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Immutable JSON representation in Java

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/*
 * Copyright 2020 Zuunr AB
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.zuunr.json;

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;

public class JsonArrayCollector implements Collector {


    public JsonArrayCollector(){}

    @Override
    public Supplier supplier() {
        return JsonArray::emptyBuilder;
    }

    @Override
    public BiConsumer accumulator() {
        return (builder, t) -> builder.add(t);
    }

    @Override
    public BinaryOperator combiner() {
        return (left, right) -> {
            left.addAll(right.build());
            return left;
        };
    }

    @Override
    public Function finisher() {
        return JsonArrayBuilder::build;
    }

    @Override
    public Set characteristics() {
        return EnumSet.of(Characteristics.UNORDERED);
    }
}