private T decodeAndCreateReturnValue()

in src/main/core-impl/java/com/mysql/cj/protocol/result/AbstractResultsetRow.java [69:209]
111 lines of code
73 McCabe index (conditional complexity)

    private <T> T decodeAndCreateReturnValue(int columnIndex, byte[] bytes, int offset, int length, ValueFactory<T> vf) {
        Field f = this.metadata.getFields()[columnIndex];

        // First, figure out which decoder method to call basing on the protocol value type from metadata;
        // it's the best way to find the appropriate decoder, we can't rely completely on MysqlType here
        // because the same MysqlType can be represented by different protocol types and also DatabaseMetaData methods,
        // eg. buildResultSet(), could imply unexpected conversions when substitutes RowData in ResultSet;
        switch (f.getMysqlTypeId()) {
            case MysqlType.FIELD_TYPE_DATETIME:
                return this.valueDecoder.decodeDatetime(bytes, offset, length, f.getDecimals(), vf);

            case MysqlType.FIELD_TYPE_TIMESTAMP:
                return this.valueDecoder.decodeTimestamp(bytes, offset, length, f.getDecimals(), vf);

            case MysqlType.FIELD_TYPE_DATE:
                return this.valueDecoder.decodeDate(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_TIME:
                return this.valueDecoder.decodeTime(bytes, offset, length, f.getDecimals(), vf);

            case MysqlType.FIELD_TYPE_TINY:
                return f.isUnsigned() ? this.valueDecoder.decodeUInt1(bytes, offset, length, vf) : this.valueDecoder.decodeInt1(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_YEAR:
                return this.valueDecoder.decodeYear(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_SHORT:
                return f.isUnsigned() ? this.valueDecoder.decodeUInt2(bytes, offset, length, vf) : this.valueDecoder.decodeInt2(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_LONG:
                return f.isUnsigned() ? this.valueDecoder.decodeUInt4(bytes, offset, length, vf) : this.valueDecoder.decodeInt4(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_INT24:
                return this.valueDecoder.decodeInt4(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_LONGLONG:
                return f.isUnsigned() ? this.valueDecoder.decodeUInt8(bytes, offset, length, vf) : this.valueDecoder.decodeInt8(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_FLOAT:
                return this.valueDecoder.decodeFloat(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_DOUBLE:
                return this.valueDecoder.decodeDouble(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_NEWDECIMAL:
            case MysqlType.FIELD_TYPE_DECIMAL:
                return this.valueDecoder.decodeDecimal(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_VAR_STRING:
            case MysqlType.FIELD_TYPE_VARCHAR:
            case MysqlType.FIELD_TYPE_STRING:
            case MysqlType.FIELD_TYPE_TINY_BLOB:
            case MysqlType.FIELD_TYPE_MEDIUM_BLOB:
            case MysqlType.FIELD_TYPE_LONG_BLOB:
            case MysqlType.FIELD_TYPE_BLOB:
            case MysqlType.FIELD_TYPE_ENUM:
            case MysqlType.FIELD_TYPE_GEOMETRY:
            case MysqlType.FIELD_TYPE_JSON:
                return this.valueDecoder.decodeByteArray(bytes, offset, length, f, vf);

            case MysqlType.FIELD_TYPE_SET:
                return this.valueDecoder.decodeSet(bytes, offset, length, f, vf);

            case MysqlType.FIELD_TYPE_BIT:
                return this.valueDecoder.decodeBit(bytes, offset, length, vf);

            case MysqlType.FIELD_TYPE_NULL:
                return vf.createFromNull();
        }

        // If the protocol type isn't available then select decoder basing on MysqlType; that's for some internal
        // code that creates rows without MySQL protocol types, only MysqlType types, including PS bindings as RS, DBMD
        switch (f.getMysqlType()) {
            case TINYINT:
                return this.valueDecoder.decodeInt1(bytes, offset, length, vf);
            case TINYINT_UNSIGNED:
                return this.valueDecoder.decodeUInt1(bytes, offset, length, vf);
            case SMALLINT:
                return this.valueDecoder.decodeInt2(bytes, offset, length, vf);
            case YEAR:
                return this.valueDecoder.decodeYear(bytes, offset, length, vf);
            case SMALLINT_UNSIGNED:
                return this.valueDecoder.decodeUInt2(bytes, offset, length, vf);
            case INT:
            case MEDIUMINT:
                return this.valueDecoder.decodeInt4(bytes, offset, length, vf);
            case INT_UNSIGNED:
            case MEDIUMINT_UNSIGNED:
                return this.valueDecoder.decodeUInt4(bytes, offset, length, vf);
            case BIGINT:
                return this.valueDecoder.decodeInt8(bytes, offset, length, vf);
            case BIGINT_UNSIGNED:
                return this.valueDecoder.decodeUInt8(bytes, offset, length, vf);
            case FLOAT:
            case FLOAT_UNSIGNED:
                return this.valueDecoder.decodeFloat(bytes, offset, length, vf);
            case DOUBLE:
            case DOUBLE_UNSIGNED:
                return this.valueDecoder.decodeDouble(bytes, offset, length, vf);
            case DECIMAL:
            case DECIMAL_UNSIGNED:
                return this.valueDecoder.decodeDecimal(bytes, offset, length, vf);

            case BOOLEAN:
            case VARBINARY:
            case VARCHAR:
            case BINARY:
            case CHAR:
            case TINYBLOB:
            case BLOB:
            case MEDIUMBLOB:
            case LONGBLOB:
            case TINYTEXT:
            case TEXT:
            case MEDIUMTEXT:
            case LONGTEXT:
            case JSON:
            case ENUM:
            case SET:
            case GEOMETRY:
            case UNKNOWN:
                return this.valueDecoder.decodeByteArray(bytes, offset, length, f, vf);

            case BIT:
                return this.valueDecoder.decodeBit(bytes, offset, length, vf);

            case DATETIME:
            case TIMESTAMP:
                return this.valueDecoder.decodeTimestamp(bytes, offset, length, f.getDecimals(), vf);
            case DATE:
                return this.valueDecoder.decodeDate(bytes, offset, length, vf);
            case TIME:
                return this.valueDecoder.decodeTime(bytes, offset, length, f.getDecimals(), vf);

            case NULL:
                return vf.createFromNull();

        }

        throw new DataReadException(Messages.getString("ResultSet.UnknownSourceType"));
    }