/* Copyright (c) 2001-2011, 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.lib.
HsqlArrayList;
/**
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.0
* @since 1.9.0
*/
public class
LobStoreMem implements
LobStore {
final int
lobBlockSize;
int
blocksInLargeBlock = 128;
int
largeBlockSize;
HsqlArrayList byteStoreList;
public
LobStoreMem(int
lobBlockSize) {
this.
lobBlockSize =
lobBlockSize;
largeBlockSize =
lobBlockSize *
blocksInLargeBlock;
byteStoreList = new
HsqlArrayList();
}
public byte[]
getBlockBytes(int
blockAddress, int
blockCount) {
byte[]
dataBytes = new byte[
blockCount *
lobBlockSize];
int
dataBlockOffset = 0;
while (
blockCount > 0) {
int
largeBlockIndex =
blockAddress /
blocksInLargeBlock;
byte[]
largeBlock = (byte[])
byteStoreList.
get(
largeBlockIndex);
int
blockOffset =
blockAddress %
blocksInLargeBlock;
int
currentBlockCount =
blockCount;
if ((
blockOffset +
currentBlockCount) >
blocksInLargeBlock) {
currentBlockCount =
blocksInLargeBlock -
blockOffset;
}
System.
arraycopy(
largeBlock,
blockOffset *
lobBlockSize,
dataBytes,
dataBlockOffset *
lobBlockSize,
currentBlockCount *
lobBlockSize);
blockAddress +=
currentBlockCount;
dataBlockOffset +=
currentBlockCount;
blockCount -=
currentBlockCount;
}
return
dataBytes;
}
public void
setBlockBytes(byte[]
dataBytes, int
blockAddress,
int
blockCount) {
int
dataBlockOffset = 0;
while (
blockCount > 0) {
int
largeBlockIndex =
blockAddress /
blocksInLargeBlock;
if (
largeBlockIndex >=
byteStoreList.
size()) {
byteStoreList.
add(new byte[
largeBlockSize]);
}
byte[]
largeBlock = (byte[])
byteStoreList.
get(
largeBlockIndex);
int
blockOffset =
blockAddress %
blocksInLargeBlock;
int
currentBlockCount =
blockCount;
if ((
blockOffset +
currentBlockCount) >
blocksInLargeBlock) {
currentBlockCount =
blocksInLargeBlock -
blockOffset;
}
System.
arraycopy(
dataBytes,
dataBlockOffset *
lobBlockSize,
largeBlock,
blockOffset *
lobBlockSize,
currentBlockCount *
lobBlockSize);
blockAddress +=
currentBlockCount;
dataBlockOffset +=
currentBlockCount;
blockCount -=
currentBlockCount;
}
}
public void
setBlockBytes(byte[]
dataBytes, long
position, int
offset,
int
length) {
while (
length > 0) {
int
largeBlockIndex = (int) (
position /
largeBlockSize);
if (
largeBlockIndex >=
byteStoreList.
size()) {
byteStoreList.
add(new byte[
largeBlockSize]);
}
byte[]
largeBlock = (byte[])
byteStoreList.
get(
largeBlockIndex);
int
offsetInLargeBlock = (int) (
position %
largeBlockSize);
int
currentLength =
length;
if ((
offsetInLargeBlock +
currentLength) >
largeBlockSize) {
currentLength =
largeBlockSize -
offsetInLargeBlock;
}
System.
arraycopy(
dataBytes,
offset,
largeBlock,
offsetInLargeBlock,
currentLength);
position +=
currentLength;
offset +=
currentLength;
length -=
currentLength;
}
}
public int
getBlockSize() {
return
lobBlockSize;
}
public long
getLength() {
return (long)
byteStoreList.
size() *
largeBlockSize;
}
public void
setLength(long
length) {
int
largeBlockIndex = (int) (
length /
largeBlockSize);
byteStoreList.
setSize(
largeBlockIndex + 1);
}
public void
close() {
byteStoreList.
clear();
}
public void
synch() {}
}