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1 package com.daffodilwoods.daffodildb.server.datasystem.indexsystem;
2
3 import com.daffodilwoods.database.utility.P;
4 import com.daffodilwoods.database.resource.*;
5 import com.daffodilwoods.daffodildb.server.datasystem.interfaces.*;
6 import com.daffodilwoods.daffodildb.server.sql99.utils._Reference;
7 import com.daffodilwoods.daffodildb.server.datasystem.btree.BTreeNode;
8 import com.daffodilwoods.daffodildb.server.datasystem.btree.BTreeElement;
9
10
11 class FileBTreeElement extends BTreeElement {
12
13
14 private Object  childNodeKey;
15
16 public FileBTreeElement() {
17 }
18
19
20 FileBTreeElement(Object key,Object value) throws DException {
21 super(key,value);
22 }
23
24 public void setChildNodeKey(Object key){
25 childNodeKey = key;
26 }
27
28 public Object getChildNodeKey(){
29 return childNodeKey;
30 }
31
32 public void setChild(BTreeNode node) throws DException{
33 super.setChild(node);
34 if(childNode != null)
35 setChildNodeKey(node.getNodeKey());
36 }
37
38 public void updateChild(BTreeNode node) throws DException{
39 setChild(node);
40 currentNode.updateChild(position,node.getNodeKey());
41 }
42
43 public void clearChild() {
44 childNode = null;
45 currentNode = null;
46 }
47
48 public BTreeNode getChild() throws DException{
49 if (childNode == null && childNodeKey != null) {
50 childNode = currentNode.getNodeManager().getNode(null,childNodeKey);
51 childNode.setParentElement(this);
52 }
53 return childNode;
54 }
55 }
56 |
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