spark-doris-connector/src/main/java/org/apache/doris/spark/util/DataUtil.java

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// 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
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// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
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package org.apache.doris.spark.util;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.json.JsonMapper;
import com.fasterxml.jackson.module.scala.DefaultScalaModule;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.doris.spark.sql.SchemaUtils;
import org.apache.spark.sql.catalyst.InternalRow;
import org.apache.spark.sql.types.StructField;
import org.apache.spark.sql.types.StructType;

import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class DataUtil {

    private static final ObjectMapper MAPPER = JsonMapper.builder().addModule(new DefaultScalaModule()).build();

    public static final String NULL_VALUE = "\\N";

    public static String rowToCsvString(InternalRow row, StructType schema, String sep, boolean quote) {
        StructField[] fields = schema.fields();
        int n = row.numFields();
        if (n > 0) {
            return IntStream.range(0, row.numFields()).boxed().map(idx -> {
                Object value = ObjectUtils.defaultIfNull(SchemaUtils.rowColumnValue(row, idx, fields[idx].dataType()),
                        NULL_VALUE);
                if (quote) {
                    value = "\"" + value + "\"";
                }
                return value.toString();
            }).collect(Collectors.joining(sep));
        }
        return StringUtils.EMPTY;
    }

    public static byte[] rowToCsvBytes(InternalRow row, StructType schema, String sep, boolean quote) {
        return rowToCsvString(row, schema, sep, quote).getBytes(StandardCharsets.UTF_8);
    }

    public static byte[] rowToJsonBytes(InternalRow row, StructType schema) throws JsonProcessingException {
        StructField[] fields = schema.fields();
        Map<String, Object> rowMap = new HashMap<>(row.numFields());
        for (int i = 0; i < fields.length; i++) {
            rowMap.put(fields[i].name(), SchemaUtils.rowColumnValue(row, i, fields[i].dataType()));
        }
        return MAPPER.writeValueAsBytes(rowMap);
    }

    public static String rowToJsonString(InternalRow row, StructType schema) throws JsonProcessingException {
        StructField[] fields = schema.fields();
        Map<String, Object> rowMap = new HashMap<>(row.numFields());
        for (int i = 0; i < fields.length; i++) {
            rowMap.put(fields[i].name(), SchemaUtils.rowColumnValue(row, i, fields[i].dataType()));
        }
        return MAPPER.writeValueAsString(rowMap);
    }

}