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/*
* Copyright (c) 2018, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj.protocol.x;
import java.io.UnsupportedEncodingException;
import com.mysql.cj.CharsetMapping;
import com.mysql.cj.MysqlType;
import com.mysql.cj.exceptions.WrongArgumentException;
import com.mysql.cj.protocol.ProtocolEntityFactory;
import com.mysql.cj.result.Field;
import com.mysql.cj.util.LazyString;
import com.mysql.cj.x.protobuf.MysqlxResultset.ColumnMetaData;
import com.mysql.cj.x.protobuf.MysqlxResultset.ColumnMetaData.FieldType;
/**
* Factory producing {@link Field} from protocol message.
*/
public class FieldFactory implements ProtocolEntityFactory {
/**
* Content-type used in type mapping.
* c.f. mysqlx_resultset.proto
*/
private static final int XPROTOCOL_COLUMN_BYTES_CONTENT_TYPE_GEOMETRY = 0x0001;
private static final int XPROTOCOL_COLUMN_BYTES_CONTENT_TYPE_JSON = 0x0002;
private static final int XPROTOCOL_COLUMN_FLAGS_UINT_ZEROFILL = 0x0001;
private static final int XPROTOCOL_COLUMN_FLAGS_DOUBLE_UNSIGNED = 0x0001;
private static final int XPROTOCOL_COLUMN_FLAGS_FLOAT_UNSIGNED = 0x0001;
private static final int XPROTOCOL_COLUMN_FLAGS_DECIMAL_UNSIGNED = 0x0001;
private static final int XPROTOCOL_COLUMN_FLAGS_BYTES_RIGHTPAD = 0x0001;
private static final int XPROTOCOL_COLUMN_FLAGS_DATETIME_TIMESTAMP = 0x0001;
private static final int XPROTOCOL_COLUMN_FLAGS_NOT_NULL = 0x0010;
private static final int XPROTOCOL_COLUMN_FLAGS_PRIMARY_KEY = 0x0020;
private static final int XPROTOCOL_COLUMN_FLAGS_UNIQUE_KEY = 0x0040;
private static final int XPROTOCOL_COLUMN_FLAGS_MULTIPLE_KEY = 0x0080;
private static final int XPROTOCOL_COLUMN_FLAGS_AUTO_INCREMENT = 0x0100;
String metadataCharacterSet;
public FieldFactory(String metadataCharSet) {
this.metadataCharacterSet = metadataCharSet;
}
@Override
public Field createFromMessage(XMessage message) {
return columnMetaDataToField((ColumnMetaData) message.getMessage(), this.metadataCharacterSet);
}
/**
* Convert a X Protocol {@link ColumnMetaData} message to a C/J {@link Field} object.
*
* @param col
* the message from the server
* @param characterSet
* the encoding of the strings in the message
* @return {@link Field}
*/
private Field columnMetaDataToField(ColumnMetaData col, String characterSet) {
try {
LazyString databaseName = new LazyString(col.getSchema().toString(characterSet));
LazyString tableName = new LazyString(col.getTable().toString(characterSet));
LazyString originalTableName = new LazyString(col.getOriginalTable().toString(characterSet));
LazyString columnName = new LazyString(col.getName().toString(characterSet));
LazyString originalColumnName = new LazyString(col.getOriginalName().toString(characterSet));
long length = Integer.toUnsignedLong(col.getLength());
int decimals = col.getFractionalDigits();
int collationIndex = 0;
if (col.hasCollation()) {
// TODO: support custom character set
collationIndex = (int) col.getCollation();
}
String encoding = CharsetMapping.getJavaEncodingForCollationIndex(collationIndex);
MysqlType mysqlType = findMysqlType(col.getType(), col.getContentType(), col.getFlags(), collationIndex);
int mysqlTypeId = xProtocolTypeToMysqlType(col.getType(), col.getContentType());
// flags translation; unsigned is handled in Field by checking the MysqlType, so here we check others
short flags = (short) 0;
if (col.getType().equals(FieldType.UINT) && 0 < (col.getFlags() & XPROTOCOL_COLUMN_FLAGS_UINT_ZEROFILL)) {
flags |= MysqlType.FIELD_FLAG_ZEROFILL;
} else if (col.getType().equals(FieldType.BYTES) && 0 < (col.getFlags() & XPROTOCOL_COLUMN_FLAGS_BYTES_RIGHTPAD)) {
mysqlType = MysqlType.CHAR;
} else if (col.getType().equals(FieldType.DATETIME) && 0 < (col.getFlags() & XPROTOCOL_COLUMN_FLAGS_DATETIME_TIMESTAMP)) {
mysqlType = MysqlType.TIMESTAMP;
}
if ((col.getFlags() & XPROTOCOL_COLUMN_FLAGS_NOT_NULL) > 0) {
flags |= MysqlType.FIELD_FLAG_NOT_NULL;
}
if ((col.getFlags() & XPROTOCOL_COLUMN_FLAGS_PRIMARY_KEY) > 0) {
flags |= MysqlType.FIELD_FLAG_PRIMARY_KEY;
}
if ((col.getFlags() & XPROTOCOL_COLUMN_FLAGS_UNIQUE_KEY) > 0) {
flags |= MysqlType.FIELD_FLAG_UNIQUE_KEY;
}
if ((col.getFlags() & XPROTOCOL_COLUMN_FLAGS_MULTIPLE_KEY) > 0) {
flags |= MysqlType.FIELD_FLAG_MULTIPLE_KEY;
}
if ((col.getFlags() & XPROTOCOL_COLUMN_FLAGS_AUTO_INCREMENT) > 0) {
flags |= MysqlType.FIELD_FLAG_AUTO_INCREMENT;
}
// According to SQL standard, NUMERIC_SCALE should be NULL for approximate numeric data types.
// DECIMAL_NOT_SPECIFIED=31 is the MySQL internal constant value used to indicate that NUMERIC_SCALE is not applicable.
// It's probably a mistake that it's exposed by protocol as a decimals and it should be replaced with 0.
switch (mysqlType) {
case FLOAT:
case FLOAT_UNSIGNED:
case DOUBLE:
case DOUBLE_UNSIGNED:
if (decimals == 31) {
decimals = 0;
}
break;
default:
break;
}
Field f = new Field(databaseName, tableName, originalTableName, columnName, originalColumnName, length, mysqlTypeId, flags, decimals,
collationIndex, encoding, mysqlType);
return f;
} catch (UnsupportedEncodingException ex) {
throw new WrongArgumentException("Unable to decode metadata strings", ex);
}
}
private MysqlType findMysqlType(FieldType type, int contentType, int flags, int collationIndex) {
switch (type) {
case SINT:
return MysqlType.BIGINT;
case UINT:
return MysqlType.BIGINT_UNSIGNED;
case FLOAT:
return 0 < (flags & XPROTOCOL_COLUMN_FLAGS_FLOAT_UNSIGNED) ? MysqlType.FLOAT_UNSIGNED : MysqlType.FLOAT;
case DOUBLE:
return 0 < (flags & XPROTOCOL_COLUMN_FLAGS_DOUBLE_UNSIGNED) ? MysqlType.DOUBLE_UNSIGNED : MysqlType.DOUBLE;
case DECIMAL:
return 0 < (flags & XPROTOCOL_COLUMN_FLAGS_DECIMAL_UNSIGNED) ? MysqlType.DECIMAL_UNSIGNED : MysqlType.DECIMAL;
case BYTES:
switch (contentType) {
case XPROTOCOL_COLUMN_BYTES_CONTENT_TYPE_GEOMETRY:
return MysqlType.GEOMETRY;
case XPROTOCOL_COLUMN_BYTES_CONTENT_TYPE_JSON:
return MysqlType.JSON;
default:
if (collationIndex == 33) {
return MysqlType.VARBINARY;
}
return MysqlType.VARCHAR;
}
case TIME:
return MysqlType.TIME;
case DATETIME:
return MysqlType.DATETIME;
case SET:
return MysqlType.SET;
case ENUM:
return MysqlType.ENUM;
case BIT:
return MysqlType.BIT;
// TODO: longlong
}
throw new WrongArgumentException("TODO: unknown field type: " + type);
}
/**
* Map a X Protocol type code from `ColumnMetaData.FieldType' to a MySQL type constant. These are the only types that will be present in
* {@link XProtocolRow}
* results.
*
* @param type
* the type as the ColumnMetaData.FieldType
* @param contentType
* the inner type
* @return A FIELD_TYPE constant from {@link MysqlType} corresponding to the combination of input parameters.
*/
private int xProtocolTypeToMysqlType(FieldType type, int contentType) {
switch (type) {
case SINT:
// TODO: figure out ranges in detail and test them
return MysqlType.FIELD_TYPE_LONGLONG;
case UINT:
return MysqlType.FIELD_TYPE_LONGLONG;
case FLOAT:
return MysqlType.FIELD_TYPE_FLOAT;
case DOUBLE:
return MysqlType.FIELD_TYPE_DOUBLE;
case DECIMAL:
return MysqlType.FIELD_TYPE_NEWDECIMAL;
case BYTES:
switch (contentType) {
case XPROTOCOL_COLUMN_BYTES_CONTENT_TYPE_GEOMETRY:
return MysqlType.FIELD_TYPE_GEOMETRY;
case XPROTOCOL_COLUMN_BYTES_CONTENT_TYPE_JSON:
return MysqlType.FIELD_TYPE_JSON;
default:
return MysqlType.FIELD_TYPE_VARCHAR;
}
case TIME:
return MysqlType.FIELD_TYPE_TIME;
case DATETIME:
// may be a timestamp or just a date if time values are missing. metadata doesn't distinguish between the two
return MysqlType.FIELD_TYPE_DATETIME;
case SET:
return MysqlType.FIELD_TYPE_SET;
case ENUM:
return MysqlType.FIELD_TYPE_ENUM;
case BIT:
return MysqlType.FIELD_TYPE_BIT;
// TODO: longlong
}
throw new WrongArgumentException("TODO: unknown field type: " + type);
}
}
