private void loadSSPage(int PageNo) throws IOException, DBException {
// LOADs a page into memory:
xBufferChannel.clear();
xBufferChannel = bufMngr.getPage(PageNo);
xBufferChannel.position(Settings.freeOffsetPos); // 5
freeOffset = xBufferChannel.getInt();
xBufferChannel.position(Settings.numOfKeysPos);
numOfKeys = xBufferChannel.getInt();
unTakenNodes = numOfKeys;
}
// public StructuralSummaryIndex(String indexName,int numOfKeys)
// {
// //this.qNameList=qNamelist;
// //this.nodeList=nodeList;
// this.indexName=indexName;
// this.numOfKeys=numOfKeys;
// logicFileMgr = LogicalFileManager.Instance;
// bufMngr = BufferManager.getInstance();
// XBufferChannel=new XBufferChannel();//vasl bshe b buf mgr:getfreepage()
// XBufferChannel.clear();
// }
public StructuralSummaryIndex(int indexPage, String indexName) throws IOException, DBException {
// usage: openning of existing SSIndex object.
this.indexName = indexName;
this.indexPage = indexPage; // always the same
this.workingPage = indexPage; // may change
logicFileMgr = LogicalFileManager.Instance;
bufMngr = BufferManager.getInstance();
xBufferChannel = new XBufferChannel(); // new ham lazem nis //vasl bshe b buf mgr:getfreepage()
// xBufferChannel.clear(); //LaZEM NIs
xBufferChannel = bufMngr.getPage(indexPage); // may change
xBufferChannel.position(Settings.freeOffsetPos); // 5
freeOffset = xBufferChannel.getInt(); // init
xBufferChannel.position(Settings.numOfKeysPos);
numOfKeys = xBufferChannel.getInt(); // init
unTakenNodes = numOfKeys;
}