hugegraph-loader/src/main/java/org/apache/hugegraph/loader/util/DataTypeUtil.java [240:316]:
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    private static Boolean parseBoolean(String key, Object rawValue) {
        if (rawValue instanceof Boolean) {
            return (Boolean) rawValue;
        }
        if (rawValue instanceof String) {
            String value = ((String) rawValue).toLowerCase();
            if (ACCEPTABLE_TRUE.contains(value)) {
                return true;
            } else if (ACCEPTABLE_FALSE.contains(value)) {
                return false;
            } else {
                throw new IllegalArgumentException(String.format(
                        "Failed to convert '%s'(key='%s') to Boolean, " +
                        "the acceptable boolean strings are %s or %s",
                        key, rawValue, ACCEPTABLE_TRUE, ACCEPTABLE_FALSE));
            }
        }
        throw new IllegalArgumentException(String.format("Failed to convert value(key='%s') " +
                                                         "'%s'(%s) to Boolean", key, rawValue,
                                                         rawValue.getClass()));
    }

    private static Number parseNumber(String key, Object value, DataType dataType) {
        E.checkState(dataType.isNumber(), "The target data type must be number");

        if (dataType.clazz().isInstance(value)) {
            return (Number) value;
        }
        try {
            switch (dataType) {
                case BYTE:
                    return Byte.valueOf(value.toString());
                case INT:
                    return Integer.valueOf(value.toString());
                case LONG:
                    return parseLong(value.toString());
                case FLOAT:
                    return Float.valueOf(value.toString());
                case DOUBLE:
                    return Double.valueOf(value.toString());
                default:
                    throw new AssertionError(String.format("Number type only contains Byte, " +
                                                           "Integer, Long, Float, Double, " +
                                                           "but got %s", dataType.clazz()));
            }
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException(String.format("Failed to convert value(key=%s) " +
                                                             "'%s'(%s) to Number", key, value,
                                                             value.getClass()), e);
        }
    }

    private static long parseLong(String rawValue) {
        if (rawValue.startsWith("-")) {
            return Long.parseLong(rawValue);
        } else {
            return Long.parseUnsignedLong(rawValue);
        }
    }

    private static Date parseDate(String key, Object value, String dateFormat, String timeZone) {
        if (value instanceof Date) {
            return (Date) value;
        }

        if (value instanceof Number) {
            return new Date(((Number) value).longValue());
        } else if (value instanceof String) {
            if (Constants.TIMESTAMP.equals(dateFormat)) {
                try {
                    long timestamp = Long.parseLong((String) value);
                    return new Date(timestamp);
                } catch (NumberFormatException e) {
                    throw new IllegalArgumentException(String.format("Invalid timestamp value " +
                                                                     "'%s'", value));
                }
            } else {
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hugegraph-spark-connector/src/main/java/org/apache/hugegraph/spark/connector/utils/DataTypeUtils.java [122:197]:
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    private static Boolean parseBoolean(String key, Object rawValue) {
        if (rawValue instanceof Boolean) {
            return (Boolean) rawValue;
        }
        if (rawValue instanceof String) {
            String value = ((String) rawValue).toLowerCase();
            if (ACCEPTABLE_TRUE.contains(value)) {
                return true;
            } else if (ACCEPTABLE_FALSE.contains(value)) {
                return false;
            } else {
                throw new IllegalArgumentException(String.format(
                        "Failed to convert '%s'(key='%s') to Boolean, " +
                        "the acceptable boolean strings are %s or %s",
                        key, rawValue, ACCEPTABLE_TRUE, ACCEPTABLE_FALSE));
            }
        }
        throw new IllegalArgumentException(String.format("Failed to convert value(key='%s') " +
                                                         "'%s'(%s) to Boolean", key, rawValue,
                                                         rawValue.getClass()));
    }

    private static Number parseNumber(String key, Object value, DataType dataType) {
        E.checkState(dataType.isNumber(), "The target data type must be number");

        if (dataType.clazz().isInstance(value)) {
            return (Number) value;
        }
        try {
            switch (dataType) {
                case BYTE:
                    return Byte.valueOf(value.toString());
                case INT:
                    return Integer.valueOf(value.toString());
                case LONG:
                    return parseLong(value.toString());
                case FLOAT:
                    return Float.valueOf(value.toString());
                case DOUBLE:
                    return Double.valueOf(value.toString());
                default:
                    throw new AssertionError(String.format("Number type only contains Byte, " +
                                                           "Integer, Long, Float, Double, " +
                                                           "but got %s", dataType.clazz()));
            }
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException(String.format("Failed to convert value(key=%s) " +
                                                             "'%s'(%s) to Number", key, value,
                                                             value.getClass()), e);
        }
    }

    private static long parseLong(String rawValue) {
        if (rawValue.startsWith("-")) {
            return Long.parseLong(rawValue);
        } else {
            return Long.parseUnsignedLong(rawValue);
        }
    }

    private static Date parseDate(String key, Object value, String dateFormat, String timeZone) {
        if (value instanceof Date) {
            return (Date) value;
        }
        if (value instanceof Number) {
            return new Date(((Number) value).longValue());
        } else if (value instanceof String) {
            if (Constants.TIMESTAMP.equals(dateFormat)) {
                try {
                    long timestamp = Long.parseLong((String) value);
                    return new Date(timestamp);
                } catch (NumberFormatException e) {
                    throw new IllegalArgumentException(String.format("Invalid timestamp value " +
                                                                     "'%s'", value));
                }
            } else {
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