flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/functions/SqlJsonUtils.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.flink.table.runtime.functions;

import org.apache.flink.annotation.Internal;
import org.apache.flink.table.api.TableException;

import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.core.JsonFactory;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.core.JsonProcessingException;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.JsonNode;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode;

/**
 * Utilities for JSON functions.
 *
 * <p>Note that these methods are called from generated code.
 */
@Internal
public class SqlJsonUtils {

    private static final JsonFactory JSON_FACTORY = new JsonFactory();
    private static final ObjectMapper MAPPER = new ObjectMapper(JSON_FACTORY);

    /** Returns a new {@link ObjectNode}. */
    public static ObjectNode createObjectNode() {
        return MAPPER.createObjectNode();
    }

    /** Serializes the given {@link JsonNode} to a JSON string. */
    public static String serializeJson(JsonNode node) {
        try {
            return MAPPER.writeValueAsString(node);
        } catch (JsonProcessingException e) {
            throw new TableException("JSON object could not be serialized: " + node.asText(), e);
        }
    }

    private SqlJsonUtils() {}
}