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Snowflake JDBC Driver
There is a newer version: 3.21.0
/*
 * Copyright (c) 2012-2019 Snowflake Computing Inc. All rights reserved.
 */
package net.snowflake.client.core.arrow;

import java.math.BigDecimal;
import java.nio.charset.StandardCharsets;
import net.snowflake.client.core.DataConversionContext;
import net.snowflake.client.core.SFException;
import net.snowflake.client.jdbc.ErrorCode;
import net.snowflake.client.jdbc.SnowflakeType;
import net.snowflake.client.jdbc.SnowflakeUtil;
import org.apache.arrow.vector.ValueVector;
import org.apache.arrow.vector.VarCharVector;

/** Convert Arrow VarCharVector to Java types */
public class VarCharConverter extends AbstractArrowVectorConverter {
  private VarCharVector varCharVector;

  public VarCharConverter(ValueVector valueVector, int columnIndex, DataConversionContext context) {
    super(SnowflakeType.TEXT.name(), valueVector, columnIndex, context);
    this.varCharVector = (VarCharVector) valueVector;
  }

  @Override
  public String toString(int index) {
    byte[] bytes = toBytes(index);
    return bytes == null ? null : new String(bytes, StandardCharsets.UTF_8);
  }

  @Override
  public byte[] toBytes(int index) {
    return isNull(index) ? null : varCharVector.get(index);
  }

  @Override
  public Object toObject(int index) {
    return toString(index);
  }

  @Override
  public short toShort(int index) throws SFException {
    String str = toString(index);
    try {
      if (str == null) {
        return 0;
      } else {
        return Short.parseShort(str);
      }
    } catch (NumberFormatException ex) {
      throw new SFException(
          ErrorCode.INVALID_VALUE_CONVERT, logicalTypeStr, SnowflakeUtil.SHORT_STR, str);
    }
  }

  @Override
  public int toInt(int index) throws SFException {
    String str = toString(index);
    try {
      if (str == null) {
        return 0;
      } else {
        return Integer.parseInt(str);
      }
    } catch (NumberFormatException ex) {
      throw new SFException(
          ErrorCode.INVALID_VALUE_CONVERT, logicalTypeStr, SnowflakeUtil.INT_STR, str);
    }
  }

  @Override
  public long toLong(int index) throws SFException {
    String str = toString(index);
    try {
      if (str == null) {
        return 0;
      } else {
        return Long.parseLong(str);
      }
    } catch (NumberFormatException ex) {
      throw new SFException(
          ErrorCode.INVALID_VALUE_CONVERT, logicalTypeStr, SnowflakeUtil.LONG_STR, str);
    }
  }

  @Override
  public float toFloat(int index) throws SFException {
    String str = toString(index);
    try {
      if (str == null) {
        return 0;
      } else {
        return Float.parseFloat(str);
      }
    } catch (NumberFormatException ex) {
      throw new SFException(
          ErrorCode.INVALID_VALUE_CONVERT, logicalTypeStr, SnowflakeUtil.FLOAT_STR, str);
    }
  }

  @Override
  public double toDouble(int index) throws SFException {
    String str = toString(index);
    try {
      if (str == null) {
        return 0;
      } else {
        return Double.parseDouble(str);
      }
    } catch (NumberFormatException ex) {
      throw new SFException(
          ErrorCode.INVALID_VALUE_CONVERT, logicalTypeStr, SnowflakeUtil.DOUBLE_STR, str);
    }
  }

  @Override
  public BigDecimal toBigDecimal(int index) throws SFException {
    String str = toString(index);
    try {
      if (str == null) {
        return null;
      } else {
        return new BigDecimal(str);
      }
    } catch (Exception ex) {
      throw new SFException(
          ErrorCode.INVALID_VALUE_CONVERT, logicalTypeStr, SnowflakeUtil.BIG_DECIMAL_STR, str);
    }
  }

  @Override
  public boolean toBoolean(int index) throws SFException {
    String str = toString(index);
    if (str == null) {
      return false;
    } else if ("0".equals(str) || Boolean.FALSE.toString().equalsIgnoreCase(str)) {
      return false;
    } else if ("1".equals(str) || Boolean.TRUE.toString().equalsIgnoreCase(str)) {
      return true;
    } else {
      throw new SFException(
          ErrorCode.INVALID_VALUE_CONVERT, logicalTypeStr,
          SnowflakeUtil.BOOLEAN_STR, str);
    }
  }
}