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JDBC Driver for the Firebird RDBMS
/*
* Firebird Open Source JavaEE Connector - 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.jdbc.field;
import org.firebirdsql.gds.ng.fields.FieldDescriptor;
import org.firebirdsql.jdbc.FBBlob;
import org.firebirdsql.jdbc.FBClob;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.SQLException;
/**
* This is Blob-based implementation of {@link FBStringField}. It should be used
* for fields declared in database as BLOB SUB_TYPE 1. This
* implementation provides all conversion routines {@link FBStringField} has.
*
* @author Roman Rokytskyy
* @author Mark Rotteveel
*/
public class FBLongVarCharField extends FBStringField implements FBFlushableField {
// TODO Reduce duplication with FBBlobField
private static final int BUFF_SIZE = 4096;
private FBBlob blob;
// Rather then hold cached data in the XSQLDAVar we will hold it in here.
private long length;
private byte[] bytes;
private InputStream binaryStream;
private Reader characterStream;
FBLongVarCharField(FieldDescriptor fieldDescriptor, FieldDataProvider dataProvider, int requiredType)
throws SQLException {
super(fieldDescriptor, dataProvider, requiredType);
}
@Override
public void close() throws SQLException {
try {
if (blob != null) blob.free();
} finally {
// forget this blob instance, resource waste
// but simplifies our life. BLOB handle will be
// released by a server automatically later
blob = null;
bytes = null;
binaryStream = null;
characterStream = null;
length = 0;
}
}
@Override
public Blob getBlob() throws SQLException {
if (blob != null) return blob;
if (isNull()) return null;
blob = new FBBlob(gdsHelper, getDatatypeCoder().decodeLong(getFieldData()));
return blob;
}
@Override
public Clob getClob() throws SQLException {
FBBlob blob = (FBBlob) getBlob();
if (blob == null) return null;
return new FBClob(blob);
}
@Override
public InputStream getBinaryStream() throws SQLException {
Blob blob = getBlob();
if (blob == null) return null;
return blob.getBinaryStream();
}
@Override
public byte[] getBytes() throws SQLException {
final Blob blob = getBlob();
if (blob == null) return null;
try (final InputStream in = blob.getBinaryStream()) {
if (in == null) return null;
final ByteArrayOutputStream bout = new ByteArrayOutputStream();
final byte[] buff = new byte[BUFF_SIZE];
int counter;
while((counter = in.read(buff)) != -1) {
bout.write(buff, 0, counter);
}
return bout.toByteArray();
} catch(IOException ioex) {
throw new TypeConversionException(BYTES_CONVERSION_ERROR + " " + ioex.getMessage());
}
}
@Override
public byte[] getCachedData() throws SQLException {
if (isNull()) return bytes;
return getBytes();
}
@Override
public FBFlushableField.CachedObject getCachedObject() throws SQLException {
if (isNull()) {
return new CachedObject(bytes, binaryStream, characterStream, length);
}
final byte[] bytes = getBytes();
return new CachedObject(bytes, null, null, bytes.length);
}
@Override
public void setCachedObject(FBFlushableField.CachedObject cachedObject) throws SQLException {
bytes = cachedObject.bytes;
binaryStream = cachedObject.binaryStream;
characterStream = cachedObject.characterStream;
length = cachedObject.length;
}
@Override
public String getString() throws SQLException {
byte[] data = getBytes();
if (data == null) return null;
return getDatatypeCoder().decodeString(data, encodingDefinition.getEncoding(), mappingPath);
}
@Override
public void setBlob(FBBlob blob) throws SQLException {
// setNull() to reset field to empty state
setNull();
setFieldData(getDatatypeCoder().encodeLong(blob.getBlobId()));
this.blob = blob;
}
@Override
public void setClob(FBClob clob) throws SQLException {
FBBlob blob = clob.getWrappedBlob();
setBlob(blob);
}
@Override
protected void setCharacterStreamInternal(Reader in, long length) throws SQLException {
// setNull() to reset field to empty state
setNull();
if (in != null) {
this.characterStream = in;
this.length = length;
}
}
@Override
public void setString(String value) throws SQLException {
// setNull() to reset field to empty state
setNull();
if (value != null) {
setBytes(getDatatypeCoder().encodeString(value, encodingDefinition.getEncoding(), mappingPath));
}
}
@Override
public void setBytes(byte[] value) throws SQLException {
// setNull() to reset field to empty state
setNull();
if (value != null) {
this.bytes = value;
this.length = value.length;
}
}
@Override
protected void setBinaryStreamInternal(InputStream in, long length) throws SQLException {
// setNull() to reset field to empty state
setNull();
if (in != null) {
this.binaryStream = in;
this.length = length;
}
}
@Override
public void flushCachedData() throws SQLException {
if (binaryStream != null) {
copyBinaryStream(this.binaryStream, this.length);
} else if (characterStream != null) {
copyCharacterStream(characterStream, length, encodingDefinition.getJavaEncodingName());
} else if (bytes != null) {
copyBytes(bytes, (int) length);
} else if (blob == null) {
setNull();
}
this.characterStream = null;
this.binaryStream = null;
this.bytes = null;
this.length = 0;
}
@Override
public void setNull() {
super.setNull();
try {
if (blob != null) blob.free();
} catch (SQLException e) {
//ignore
} finally {
blob = null;
binaryStream = null;
characterStream = null;
bytes = null;
length = 0;
}
}
private void copyBinaryStream(InputStream in, long length) throws SQLException {
FBBlob blob = new FBBlob(gdsHelper);
blob.copyStream(in, length);
setFieldData(getDatatypeCoder().encodeLong(blob.getBlobId()));
}
private void copyCharacterStream(Reader in, long length, String encoding) throws SQLException {
FBBlob blob = new FBBlob(gdsHelper);
blob.copyCharacterStream(in, length, encoding);
setFieldData(getDatatypeCoder().encodeLong(blob.getBlobId()));
}
private void copyBytes(byte[] bytes, int length) throws SQLException {
FBBlob blob = new FBBlob(gdsHelper);
blob.copyBytes(bytes, 0, length);
setFieldData(getDatatypeCoder().encodeLong(blob.getBlobId()));
}
}