/* 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
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.persist;
import java.io.
FileNotFoundException;
import java.io.
IOException;
import java.io.
RandomAccessFile;
import org.hsqldb.
Database;
import org.hsqldb.error.
Error;
import org.hsqldb.error.
ErrorCode;
/**
* This class is a simple wrapper for a random access file such as used
* for backup and lobs.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.3
* @since 1.9.0
*/
final class
RAFileSimple implements
RandomAccessInterface {
final
RandomAccessFile file;
final boolean
readOnly;
final
EventLogInterface logger;
RAFileSimple(
EventLogInterface logger,
String name,
String openMode) throws
FileNotFoundException,
IOException {
this.
file = new
RandomAccessFile(
name,
openMode);
this.
logger =
logger;
readOnly =
openMode.
equals("r");
}
public long
length() throws
IOException {
return
file.
length();
}
public void
seek(long
position) throws
IOException {
file.
seek(
position);
}
public long
getFilePointer() throws
IOException {
return
file.
getFilePointer();
}
public int
read() throws
IOException {
return
file.
read();
}
public long
readLong() throws
IOException {
return
file.
readLong();
}
public int
readInt() throws
IOException {
return
file.
readInt();
}
public void
read(byte[]
b, int
offset, int
length) throws
IOException {
file.
readFully(
b,
offset,
length);
}
public void
write(byte[]
b, int
off, int
len) throws
IOException {
file.
write(
b,
off,
len);
}
public void
writeInt(int
i) throws
IOException {
file.
writeInt(
i);
}
public void
writeLong(long
i) throws
IOException {
file.
writeLong(
i);
}
public void
close() throws
IOException {
file.
close();
}
public boolean
isReadOnly() {
return
readOnly;
}
public boolean
ensureLength(long
newLength) {
try {
if (!
readOnly &&
file.
length() <
newLength) {
file.
seek(
newLength - 1);
file.
writeByte(0);
}
} catch (
IOException e) {
logger.
logWarningEvent("data file enlarge failed ",
e);
return false;
}
return true;
}
public boolean
setLength(long
newLength) {
try {
file.
setLength(
newLength);
return true;
} catch (
Throwable t) {
return false;
}
}
public
Database getDatabase() {
return null;
}
public void
synch() {
try {
file.
getFD().
sync();
} catch (
Throwable t) {
try {
file.
getFD().
sync();
} catch (
Throwable tt) {
logger.
logSevereEvent("RA file sync error ",
t);
throw
Error.
error(
t,
ErrorCode.
FILE_IO_ERROR, null);
}
}
}
}