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TDB is a storage subsystem for Jena and ARQ, it is a native triple store providing persistent storage of triples/quads.

There is a newer version: 4.10.0

/*
 * Licensed to the Apache Software Foundation (ASF) under one
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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *
 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.jena.tdb.index.bplustree;

import org.apache.jena.tdb.base.block.BlockConverter ;
import org.apache.jena.tdb.base.block.BlockMgr ;
import org.apache.jena.tdb.base.page.PageBlockMgr ;

abstract class BPTreePageMgr extends PageBlockMgr
{
    // BPTreeRecordMgr works on a RecordBufferPageMgr
    // BPTreeNodeMgr works on a BPTreeNodeMgr 
    // so they share very little.
    
    protected final BPlusTree bpTree ;
    
    BPTreePageMgr(BPlusTree bpTree, BlockConverter pageFactory, BlockMgr blockMgr)
    {
        super(pageFactory, blockMgr) ;
        this.bpTree = bpTree ;
    }
}