| /* Copyright (c) 2001-2009, 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; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * 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 java.io.DataInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.hsqldb.Database; |
| import org.hsqldb.error.Error; |
| import org.hsqldb.error.ErrorCode; |
| |
| /** |
| * @author Fred Toussi (fredt@users dot sourceforge.net) |
| * @version 1.9.0 |
| * @since 1.9.0 |
| */ |
| public class LobStoreInJar implements LobStore { |
| |
| final int lobBlockSize; |
| Database database; |
| DataInputStream file; |
| final String fileName; |
| |
| // |
| long realPosition; |
| |
| public LobStoreInJar(Database database, int lobBlockSize) { |
| |
| this.lobBlockSize = lobBlockSize; |
| this.database = database; |
| |
| try { |
| fileName = database.getPath() + ".lobs"; |
| } 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]; |
| |
| fileSeek(address); |
| file.readFully(dataBytes, 0, count); |
| |
| realPosition = address + count; |
| |
| return dataBytes; |
| } catch (Throwable t) { |
| throw Error.error(ErrorCode.DATA_FILE_ERROR, t); |
| } |
| } |
| |
| public void setBlockBytes(byte[] dataBytes, int blockAddress, |
| int blockCount) {} |
| |
| public int getBlockSize() { |
| return lobBlockSize; |
| } |
| |
| public void close() { |
| |
| try { |
| if (file != null) { |
| file.close(); |
| } |
| } catch (Throwable t) { |
| throw Error.error(ErrorCode.DATA_FILE_ERROR, t); |
| } |
| } |
| |
| private void resetStream() throws IOException { |
| |
| if (file != null) { |
| file.close(); |
| } |
| |
| InputStream fis; |
| |
| try { |
| fis = getClass().getResourceAsStream(fileName); |
| |
| if (fis == null) { |
| fis = Thread.currentThread().getContextClassLoader() |
| .getResourceAsStream(fileName); |
| } |
| } catch (Throwable t) { |
| throw Error.error(ErrorCode.DATABASE_NOT_EXISTS, t); |
| } |
| |
| file = new DataInputStream(fis); |
| realPosition = 0; |
| } |
| |
| private void fileSeek(long position) throws IOException { |
| |
| if (file == null) { |
| resetStream(); |
| } |
| |
| long skipPosition = realPosition; |
| |
| if (position < skipPosition) { |
| resetStream(); |
| |
| skipPosition = 0; |
| } |
| |
| while (position > skipPosition) { |
| skipPosition += file.skip(position - skipPosition); |
| } |
| |
| realPosition = position; |
| } |
| } |