/* Copyright (c) 2001-2015, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.persist;
import org.hsqldb.
Database;
import org.hsqldb.error.
Error;
import org.hsqldb.error.
ErrorCode;
/**
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.3
* @since 1.9.0
*/
public class
LobStoreRAFile implements
LobStore {
final int
lobBlockSize;
String fileName;
RandomAccessInterface file;
Database database;
public
LobStoreRAFile(
Database database, int
lobBlockSize) {
this.
database =
database;
this.
lobBlockSize =
lobBlockSize;
this.
fileName =
database.
getPath() + ".lobs";
try {
boolean
exists =
database.
logger.
getFileAccess().
isStreamElement(
fileName);
if (
exists) {
openFile();
}
} catch (
Throwable t) {
throw
Error.
error(
ErrorCode.
DATA_FILE_ERROR,
t);
}
}
private void
openFile() {
try {
boolean
readonly =
database.
isFilesReadOnly();
if (
database.
logger.
isStoredFileAccess()) {
file =
RAFile.
newScaledRAFile(
database,
fileName,
readonly,
RAFile.
DATA_FILE_STORED);
} else {
file = new
RAFileSimple(
database.
logger,
fileName,
readonly ? "r"
: "rws");
}
} catch (
Throwable t) {
throw
Error.
error(
ErrorCode.
DATA_FILE_ERROR,
t);
}
}
public byte[]
getBlockBytes(int
blockAddress, int
blockCount) {
if (
file == null) {
throw
Error.
error(
ErrorCode.
FILE_IO_ERROR);
}
try {
long
address = (long)
blockAddress *
lobBlockSize;
int
count =
blockCount *
lobBlockSize;
byte[]
dataBytes = new byte[
count];
file.
seek(
address);
file.
read(
dataBytes, 0,
count);
return
dataBytes;
} catch (
Throwable t) {
throw
Error.
error(
ErrorCode.
DATA_FILE_ERROR,
t);
}
}
public void
setBlockBytes(byte[]
dataBytes, int
blockAddress,
int
blockCount) {
if (
file == null) {
openFile();
}
try {
long
address = (long)
blockAddress *
lobBlockSize;
int
count =
blockCount *
lobBlockSize;
file.
seek(
address);
file.
write(
dataBytes, 0,
count);
} catch (
Throwable t) {
throw
Error.
error(
ErrorCode.
DATA_FILE_ERROR,
t);
}
}
public void
setBlockBytes(byte[]
dataBytes, long
position, int
offset,
int
length) {
if (
length == 0) {
return;
}
if (
file == null) {
openFile();
}
try {
file.
seek(
position);
file.
write(
dataBytes,
offset,
length);
} catch (
Throwable t) {
throw
Error.
error(
ErrorCode.
DATA_FILE_ERROR,
t);
}
}
public int
getBlockSize() {
return
lobBlockSize;
}
public long
getLength() {
if (
file == null) {
openFile();
}
try {
return
file.
length();
} catch (
Throwable t) {
throw
Error.
error(
ErrorCode.
DATA_FILE_ERROR,
t);
}
}
public void
setLength(long
length) {
try {
if (
file != null) {
file.
setLength(
length);
file.
synch();
}
} catch (
Throwable t) {
throw
Error.
error(
ErrorCode.
DATA_FILE_ERROR,
t);
}
}
public void
close() {
try {
if (
file != null) {
file.
synch();
file.
close();
}
} catch (
Throwable t) {
throw
Error.
error(
ErrorCode.
DATA_FILE_ERROR,
t);
}
}
public void
synch() {
if (
file != null) {
file.
synch();
}
}
}