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JDBC Driver for the Firebird RDBMS
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/*
* Firebird Open Source JDBC Driver
*
* Distributable under LGPL license.
* You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
*
* 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
* LGPL License for more details.
*
* This file was created by members of the firebird development team.
* All individual contributions remain the Copyright (C) of those
* individuals. Contributors to this file are either listed here or
* can be obtained from a source control history command.
*
* All rights reserved.
*/
package org.firebirdsql.gds.ng.wire.version13;
import org.firebirdsql.gds.impl.wire.XdrInputStream;
import org.firebirdsql.gds.impl.wire.XdrOutputStream;
import org.firebirdsql.gds.ng.fields.*;
import org.firebirdsql.gds.ng.wire.FbWireDatabase;
import org.firebirdsql.gds.ng.wire.version12.V12Statement;
import java.io.IOException;
import java.sql.SQLException;
import java.util.BitSet;
/**
* @author Mark Rotteveel
*/
public class V13Statement extends V12Statement {
/**
* Creates a new instance of V13Statement for the specified database.
*
* @param database
* FbWireDatabase implementation
*/
public V13Statement(FbWireDatabase database) {
super(database);
}
@Override
protected RowValue readSqlData() throws SQLException, IOException {
final RowDescriptor rowDescriptor = getRowDescriptor();
final RowValue rowValue = rowDescriptor.createDefaultFieldValues();
final BlrCalculator blrCalculator = getBlrCalculator();
final XdrInputStream xdrIn = getXdrIn();
final int nullBitsLen = (rowDescriptor.getCount() + 7) / 8;
final BitSet nullBits = BitSet.valueOf(xdrIn.readBuffer(nullBitsLen));
for (int idx = 0; idx < rowDescriptor.getCount(); idx++) {
final FieldDescriptor fieldDescriptor = rowDescriptor.getFieldDescriptor(idx);
if (nullBits.get(idx)) {
rowValue.setFieldData(idx, null);
} else {
final int len = blrCalculator.calculateIoLength(fieldDescriptor);
final byte[] buffer = readColumnData(xdrIn, len);
rowValue.setFieldData(idx, buffer);
}
}
return rowValue;
}
@Override
protected void writeSqlData(final RowDescriptor rowDescriptor, final RowValue fieldValues, boolean useActualLength)
throws IOException, SQLException {
writeSqlData(getXdrOut(), getBlrCalculator(), rowDescriptor, fieldValues, useActualLength);
}
protected void writeSqlData(XdrOutputStream xdrOut, BlrCalculator blrCalculator, RowDescriptor rowDescriptor,
RowValue fieldValues, boolean useActualLength) throws IOException, SQLException {
// null indicator bitmap
final BitSet nullBits = new BitSet(fieldValues.getCount());
for (int idx = 0; idx < fieldValues.getCount(); idx++) {
nullBits.set(idx, fieldValues.getFieldData(idx) == null);
}
final byte[] nullBitsBytes = nullBits.toByteArray(); // Note only amount of bytes necessary for highest bit set
xdrOut.write(nullBitsBytes);
final int requiredBytes = (rowDescriptor.getCount() + 7) / 8;
final int remainingBytes = requiredBytes - nullBitsBytes.length;
if (remainingBytes > 0) {
xdrOut.write(new byte[remainingBytes]);
}
xdrOut.writeAlignment(requiredBytes);
for (int idx = 0; idx < fieldValues.getCount(); idx++) {
if (!nullBits.get(idx)) {
final byte[] buffer = fieldValues.getFieldData(idx);
final FieldDescriptor fieldDescriptor = rowDescriptor.getFieldDescriptor(idx);
final int len = useActualLength
? blrCalculator.calculateIoLength(fieldDescriptor, buffer)
: blrCalculator.calculateIoLength(fieldDescriptor);
writeColumnData(xdrOut, len, buffer, fieldDescriptor);
}
}
}
}
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