|
1 package com.daffodilwoods.daffodildb.server.datasystem.indexsystem;
2
3 import com.daffodilwoods.daffodildb.server.datasystem.btree.*;
4 import com.daffodilwoods.daffodildb.server.datasystem.interfaces._DatabaseUser;
5 import com.daffodilwoods.database.resource.DException;
6 import com.daffodilwoods.daffodildb.utils.byteconverter.CbCzufIboemfs;
7 import com.daffodilwoods.daffodildb.server.datasystem.interfaces._Index;
8
9 public class MemoryNodeManager implements _NodeManager {
10
11 private int size = 0;
12 private _Index btree;
13 private BTreeNode rootNode ;
14 private IndexColumnInformation iinf;
15 private int nodeSize;
16
17 public MemoryNodeManager(IndexColumnInformation iinf1){
18 iinf = iinf1;
19 nodeSize = 255;
20 }
21
22 public MemoryNodeManager(IndexColumnInformation iinf1,int nodeSize0){
23 iinf = iinf1;
24 nodeSize = nodeSize0;
25 }
26
27
28
29 public BTreeNode getRootNode(_DatabaseUser user)throws DException {
30 return rootNode;
31 }
32
33 public BTreeNode getNewNode(_DatabaseUser user)throws DException {
34 MemoryNode memoryNode = new MemoryNode(nodeSize);
35 BTreeNode node = new BTreeNode(btree,memoryNode);
36 memoryNode.setNode(node);
37 return node;
38 }
39
40 public void updateSize(_DatabaseUser user,boolean increment) throws DException{
41 size += increment ? 1 : -1;
42 if(size == 0){
43 rootNode = null;
44 }
45 }
46
47 public void updateBTreeInfo(_DatabaseUser user,BTreeNode node) throws DException {
48 rootNode = node;
49 }
50 public void updateSizeAndBTreeInfo(_DatabaseUser user,boolean increment,BTreeNode node) throws DException {
51 rootNode = node;
52 size += increment ? 1 : -1;
53 if (size == 0) {
54 rootNode = null;
55 }
56 }
57
58 public int getSize() {
59 return size;
60 }
61
62 public BTreeNode getNodeForRead( BTreeElement element) throws DException{
63 return element.getChild();
64 }
65
66 public void setBTree(_Index btree0){
67 btree = btree0;
68 }
69
70 public BTreeNode getNode(_DatabaseUser user,Object  nodeKey) throws DException{
71 return (BTreeNode)nodeKey;
72 }
73
74 public CbCzufIboemfs[] getByteHandlers() throws DException{
75 return iinf.getHandlers();
76 }
77
78 public int[] getColumnTypes() throws DException{
79 return iinf.getTypeOfColumns();
80 }
81 public void setSize(int size){
82
83 throw new java.lang.UnsupportedOperationException ("Method setSize() not yet implemented.");
84 }
85
86 public void releaseResource(_DatabaseUser user,boolean releaseCompletely) throws
87 DException{
88 }
89
90
91 }
92 |
Popular Tags |
Java API By Example, From Geeks To Geeks.