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The Java client that provides an easy and convenient way to interact with InfluxDB 3. This package supports both writing data to InfluxDB and querying data using the FlightSQL client, which allows you to execute SQL queries against InfluxDB IOx.
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/*
 * The MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.influxdb.v3.client.internal;

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.ThreadSafe;

import org.apache.arrow.vector.FieldVector;
import org.apache.arrow.vector.VectorSchemaRoot;
import org.apache.arrow.vector.types.pojo.ArrowType;
import org.apache.arrow.vector.types.pojo.Field;
import org.apache.arrow.vector.util.Text;

import com.influxdb.v3.client.PointValues;


/**
 * The VectorSchemaRootConverter class is responsible for converting rows of data from a VectorSchemaRoot object
 * to PointValues. It provides a method to perform this conversion.
 * 
 * This class is thread-safe.
 */
@ThreadSafe
final class VectorSchemaRootConverter {

    static final VectorSchemaRootConverter INSTANCE = new VectorSchemaRootConverter();

    /**
     * Converts a given row of data from a VectorSchemaRoot object to PointValues.
     *
     * @param rowNumber    the index of the row to be converted
     * @param vector       the VectorSchemaRoot object containing the data
     * @param fieldVectors the list of FieldVector objects representing the data columns
     * @return the converted PointValues object
     */
    @Nonnull
    PointValues toPointValues(final int rowNumber,
                              @Nonnull final VectorSchemaRoot vector,
                              @Nonnull final List fieldVectors) {
        PointValues p = new PointValues();
        for (int i = 0; i < fieldVectors.size(); i++) {
            var schema = vector.getSchema().getFields().get(i);
            var value = fieldVectors.get(i).getObject(rowNumber);
            var name = schema.getName();
            var metaType = schema.getMetadata().get("iox::column::type");

            if (value instanceof Text) {
                value = value.toString();
            }

            if ((Objects.equals(name, "measurement")
                    || Objects.equals(name, "iox::measurement"))
                    && value instanceof String) {
                p.setMeasurement((String) value);
                continue;
            }

            if (metaType == null) {
                if (Objects.equals(name, "time") && (value instanceof Long || value instanceof LocalDateTime)) {
                    setTimestamp(value, schema, p);
                } else {
                    // just push as field If you don't know what type is it
                    p.setField(name, value);
                }

                continue;
            }

            String[] parts = metaType.split("::");
            String valueType = parts[2];

            if ("field".equals(valueType)) {
                p.setField(name, value);
            } else if ("tag".equals(valueType) && value instanceof String) {
                p.setTag(name, (String) value);
            } else if ("timestamp".equals(valueType)) {
                setTimestamp(value, schema, p);
            }
        }
        return p;
    }

    private void setTimestamp(@Nonnull final Object value,
                              @Nonnull final Field schema,
                              @Nonnull final PointValues pointValues) {
        if (value instanceof Long) {
            if (schema.getFieldType().getType() instanceof ArrowType.Timestamp) {
                ArrowType.Timestamp type = (ArrowType.Timestamp) schema.getFieldType().getType();
                TimeUnit timeUnit;
                switch (type.getUnit()) {
                    case SECOND:
                        timeUnit = TimeUnit.SECONDS;
                        break;
                    case MILLISECOND:
                        timeUnit = TimeUnit.MILLISECONDS;
                        break;
                    case MICROSECOND:
                        timeUnit = TimeUnit.MICROSECONDS;
                        break;
                    default:
                    case NANOSECOND:
                        timeUnit = TimeUnit.NANOSECONDS;
                        break;
                }
                long nanoseconds = TimeUnit.NANOSECONDS.convert((Long) value, timeUnit);
                pointValues.setTimestamp(Instant.ofEpochSecond(0, nanoseconds));
            } else {
                pointValues.setTimestamp(Instant.ofEpochMilli((Long) value));
            }
        } else if (value instanceof LocalDateTime) {
            pointValues.setTimestamp(((LocalDateTime) value).toInstant(ZoneOffset.UTC));
        }
    }
}