/*
* $Id$
*
* Copyright (C) 2003-2015 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.fs.ntfs.index;
import java.io.IOException;
import java.util.Iterator;
import org.jnode.fs.ntfs.FileRecord;
import org.jnode.fs.ntfs.NTFSRecord;
/**
* @author Ewout Prangsma (epr@users.sourceforge.net)
*/
final class IndexBlock extends NTFSRecord {
/** Cached header instance */
private IndexHeader header;
/** Parent file */
private final FileRecord parentFileRecord;
/**
* @param buffer
* @param offset
*/
public IndexBlock(FileRecord parentFileRecord, byte[] buffer, int offset) throws IOException {
super(parentFileRecord.getVolume().getBootRecord().getBytesPerSector(), true, buffer, offset);
this.parentFileRecord = parentFileRecord;
}
/**
* $LogFile sequence number of the last modification of this index block.
*
* @return
*/
public long getLogFileSequenceNumber() {
return getInt64(0x08);
}
/**
* Virtual cluster number of the index block. If the cluster_size on the
* volume is <= the index_block_size of the directory, index_block_vcn
* counts in units of clusters, and in units of sectors otherwise.
*
* @return
*/
public long getIndexBlockVCN() {
return getUInt32(0x10);
}
/**
* Describes the following index entries.
*
* @return
*/
public IndexHeader getHeader() {
if (header == null) {
header = new IndexHeader(this, 0x18);
}
return header;
}
/**
* Gets the parent file record.
*
* @return
*/
public FileRecord getParentFileRecord() {
return parentFileRecord;
}
/**
* Gets an iterator to iterate over all IndexEntry's in this block.
*
* @return
*/
public Iterator<IndexEntry> iterator() {
return new IndexEntryIterator(parentFileRecord, this,
getHeader().getFirstEntryOffset() + 0x18);
}
}