/**
* Copyright (C) 2009-2013 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.foundationdb.server.rowdata.encoding;
import com.foundationdb.server.types.TClass;
import com.foundationdb.server.types.TInstance;
import com.foundationdb.server.types.aksql.aktypes.AkGUID;
import com.foundationdb.server.types.common.types.StringAttribute;
import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import java.nio.charset.UnsupportedCharsetException;
import java.sql.Types;
import java.util.HashMap;
import java.util.Map;
@SuppressWarnings("unused")
public final class Encoders
{
private Encoders() {
}
public static Encoding encodingFor(TInstance type) {
TClass tclass = TInstance.tClass(type);
if (tclass == null)
return null;
int jdbcType = tclass.jdbcType();
switch (jdbcType) {
case Types.DECIMAL:
case Types.NUMERIC:
return DecimalEncoder.INSTANCE;
case Types.BIGINT:
if (tclass.isUnsigned())
return UBigIntEncoder.INSTANCE;
/* else falls through */
case Types.TINYINT:
case Types.SMALLINT:
case Types.INTEGER:
case Types.BOOLEAN:
case Types.DATE:
case Types.TIME:
case Types.TIMESTAMP:
return LongEncoder.INSTANCE;
case Types.FLOAT:
case Types.REAL:
return FloatEncoder.INSTANCE;
case Types.DOUBLE:
return DoubleEncoder.INSTANCE;
case Types.BINARY:
case Types.BIT:
case Types.LONGVARBINARY:
case Types.VARBINARY:
case Types.BLOB:
return VarBinaryEncoder.INSTANCE;
case Types.CHAR:
case Types.NCHAR:
case Types.NVARCHAR:
case Types.VARCHAR:
case Types.LONGNVARCHAR:
case Types.LONGVARCHAR:
case Types.CLOB:
return charEncoding(StringAttribute.charsetName(type));
default:
if (tclass == AkGUID.INSTANCE) {
return GuidEncoder.INSTANCE;
}
return null;
}
}
private static final Map<String,Encoding> charEncodingMap = new HashMap<>();
/**
* Get the encoding for a character column.
*/
public static Encoding charEncoding(String charsetName) {
synchronized (charEncodingMap) {
Encoding encoding = charEncodingMap.get(charsetName);
if (encoding == null) {
try {
Charset charset = Charset.forName(charsetName);
if (charset.name().equals("UTF-8"))
encoding = UTF8Encoder.INSTANCE;
else if (charset.newEncoder().maxBytesPerChar() == 1.0)
encoding = SBCSEncoder.INSTANCE;
}
catch (IllegalCharsetNameException |
UnsupportedCharsetException |
UnsupportedOperationException ex) {
encoding = SBCSEncoder.INSTANCE;
}
if (encoding == null)
encoding = new SlowMBCSEncoder(charsetName);
charEncodingMap.put(charsetName, encoding);
}
return encoding;
}
}
}