com.speedment.plugins.json.internal.JsonCollectorImpl Maven / Gradle / Ivy

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This plugin allows you to easily convert Speedment entities into JSON.

There is a newer version: 3.2.10

/**
 *
 * Copyright (c) 2006-2018, Speedment, Inc. All Rights Reserved.
 *
 * 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.speedment.plugins.json.internal;

import com.speedment.plugins.json.JsonCollector;
import java.util.*;
import static java.util.Objects.requireNonNull;
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;

/**
 *
 * @author Emil Forslund
 * @param  type of the entity
 * @since 1.0.0
 */
public final class JsonCollectorImpl implements JsonCollector {

    public static  JsonCollector collect(Function converter) {
        return new JsonCollectorImpl<>(converter);
    }

    @Override
    public Supplier supplier() {
        return () -> new StringJoiner(",", "[", "]");
    }

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

    @Override
    public BinaryOperator combiner() {
        return StringJoiner::merge;
    }

    @Override
    public Function finisher() {
        return StringJoiner::toString;
    }

    private static final Set CHARACTERISTICS
        = Collections.unmodifiableSet(EnumSet.noneOf(Characteristics.class));

    @Override
    public Set characteristics() {
        return CHARACTERISTICS;
    }

    private JsonCollectorImpl(Function converter) {
        this.converter = requireNonNull(converter);
    }

    private final Function converter;
}