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package org.hsqldb.index;
import org.hsqldb.RowAVLDiskData;
import org.hsqldb.RowAVLDisk;
import org.hsqldb.Row;
import org.hsqldb.persist.PersistentStore;
// fredt@users 20020221 - patch 513005 by sqlbob@users (RMP)
// fredt@users 20020920 - path 1.7.1 - refactoring to cut mamory footprint
// fredt@users 20021205 - path 1.7.2 - enhancements
// fredt@users 20021215 - doc 1.7.2 - javadoc comments
/**
* Text table node implementation.<p>
* Nodes for the AVL tree are all built and kept in memory while the actual
* row data is accessed via TextCache from disk.<p>
* This differs from MemoryNode by maintaining an integral pointer for the
* Row data instead of a Java reference.
*
* New class derived from Hypersonic SQL code and enhanced in HSQLDB. <p>
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 1.9.0
* @since 1.7.1
*/
public class NodeAVLMemoryPointer extends NodeAVLBaseMemory {
public int iData = NO_POS;
private NodeAVL nPrimary; // node of key / primary index for this row
public NodeAVLMemoryPointer(RowAVLDisk r) {
iData = r.getPos();
nPrimary = r.nPrimaryNode == null ? this
: r.nPrimaryNode;
}
public void delete() {
super.delete();
}
public int getPos() {
return iData;
}
Row getRow(PersistentStore store) {
if (iData == NO_POS) {
return null;
}
RowAVLDiskData row = (RowAVLDiskData) store.get(iData, false);
row.nPrimaryNode = nPrimary;
return row;
}
}