io.helidon.dbclient.jsonp.JsonProcessingMapper Maven / Gradle / Ivy

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/*
 * Copyright (c) 2019, 2023 Oracle and/or its affiliates.
 *
 * 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 io.helidon.dbclient.jsonp;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Collections;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;

import io.helidon.dbclient.DbMapper;
import io.helidon.dbclient.DbRow;

import jakarta.json.Json;
import jakarta.json.JsonBuilderFactory;
import jakarta.json.JsonObject;
import jakarta.json.JsonObjectBuilder;
import jakarta.json.JsonValue;

/**
 * Json processing mapper.
 */
public final class JsonProcessingMapper implements DbMapper {
    private static final JsonBuilderFactory JSON = Json.createBuilderFactory(Collections.emptyMap());
    private static final Map, DbJsonWriter> JSON_WRITERS = new IdentityHashMap<>();
    private static final DbJsonWriter NUMBER_WRITER = (builder, name, value) -> builder.add(name, ((Number) value).longValue());
    private static final DbJsonWriter OBJECT_WRITER = (builder, name, value) -> builder.add(name, String.valueOf(value));

    static {
        JSON_WRITERS.put(Integer.class, (builder, name, value) -> builder.add(name, (Integer) value));
        JSON_WRITERS.put(Short.class, (builder, name, value) -> builder.add(name, (Short) value));
        JSON_WRITERS.put(Byte.class, (builder, name, value) -> builder.add(name, (Byte) value));
        JSON_WRITERS.put(AtomicInteger.class, (builder, name, value) -> builder.add(name, ((AtomicInteger) value).get()));
        JSON_WRITERS.put(Float.class, (builder, name, value) -> builder.add(name, (Float) value));
        JSON_WRITERS.put(Double.class, (builder, name, value) -> builder.add(name, (Double) value));
        JSON_WRITERS.put(BigInteger.class, (builder, name, value) -> builder.add(name, (BigInteger) value));
        JSON_WRITERS.put(BigDecimal.class, (builder, name, value) -> builder.add(name, (BigDecimal) value));
        JSON_WRITERS.put(Long.class, (builder, name, value) -> builder.add(name, (Long) value));
        JSON_WRITERS.put(String.class, (builder, name, value) -> builder.add(name, (String) value));
        JSON_WRITERS.put(Boolean.class, (builder, name, value) -> builder.add(name, (Boolean) value));
        // primitives
        JSON_WRITERS.put(int.class, JSON_WRITERS.get(Integer.class));
        JSON_WRITERS.put(short.class, JSON_WRITERS.get(Short.class));
        JSON_WRITERS.put(byte.class, JSON_WRITERS.get(Byte.class));
        JSON_WRITERS.put(float.class, JSON_WRITERS.get(Float.class));
        JSON_WRITERS.put(double.class, JSON_WRITERS.get(Double.class));
        JSON_WRITERS.put(long.class, JSON_WRITERS.get(Long.class));
        JSON_WRITERS.put(boolean.class, JSON_WRITERS.get(Boolean.class));
    }

    private JsonProcessingMapper() {
    }

    /**
     * Create a new mapper that can map {@link jakarta.json.JsonObject} to DB parameters and {@link DbRow}
     * to a {@link jakarta.json.JsonObject}.
     *
     * @return a new mapper
     */
    public static JsonProcessingMapper create() {
        return new JsonProcessingMapper();
    }

    /**
     * Get a JSON-P representation of this row.
     *
     * @return json object containing column name to column value.
     */
    @Override
    public JsonObject read(DbRow row) {
        JsonObjectBuilder objectBuilder = JSON.createObjectBuilder();
        row.forEach(dbCol -> toJson(objectBuilder, dbCol.name(), dbCol.javaType(), dbCol.get()));
        return objectBuilder.build();
    }

    @Override
    public Map toNamedParameters(JsonObject value) {
        Map result = new HashMap<>();
        value.forEach((name, json) -> result.put(name, toObject(name, json, value)));

        return result;
    }

    @Override
    public List