/** Changes the record of what block follows the specified one. */
@Override
protected void setNextBlock(final int offset, final int nextBlock) {
BATBlockAndIndex bai = getBATBlockAndIndex(offset);
bai.getBlock().setValueAt(bai.getIndex(), nextBlock);
}
/** Works out what block follows the specified one. */
@Override
protected int getNextBlock(final int offset) {
BATBlockAndIndex bai = getBATBlockAndIndex(offset);
return bai.getBlock().getValueAt(bai.getIndex());
}