FODBCollectionIndexFile.java

00001 /*
00002  * OpenMobileIS - a free Java(TM) Framework for mobile applications Java(TM)
00003  * Copyright (C) 2004-2006 Philippe Delrieu
00004  * All rights reserved.
00005  * Contact: pdelrieu@openmobileis.org
00006  *
00007  * This library is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or any later version.
00011  *
00012  * This library is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with this library; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
00020  * USA
00021  *
00022  *  Author : Philippe Delrieu
00023  *  
00024  *  Modifications :
00025  *  2004 Creation P.Delrieu
00026  *  2004 Modified by Romain Beaugrand
00027  * 
00028  */
00029 package org.openmobileis.database.fastobjectdb.db.store;
00030 
00031 import java.io.IOException;
00032 
00033 import org.openmobileis.database.fastobjectdb.db.index.FODBIndexHeader;
00034 import org.openmobileis.database.fastobjectdb.db.index.node.Node;
00035 
00036 
00047 public class FODBCollectionIndexFile {
00048         FODBCollectionFile collectionFile;
00049         
00050         public FODBCollectionIndexFile(FODBCollectionFile cf) {
00051                 collectionFile = cf;
00052         }
00053         
00054         public Node readNode(long pos)  throws IOException, ClassNotFoundException  {
00055                 return (Node)collectionFile.readNode(pos);
00056         }
00057         
00058         public long writeNode(Node node, FODBIndexHeader header) throws IOException, ClassNotFoundException  {
00059                 // if new page, find a place to write it
00060                 if (node.filePtr == Node.NO_NODE) {
00061                         // write the new page
00062                         node.filePtr = collectionFile.writeNode(node);
00063                 } else { // write in old position  
00064                         collectionFile.rewriteNode(node, node.filePtr);
00065                 }
00066 
00067                 // if root, change root pointer It' important that the test is always made even if rewrite is call.
00068         // root node can change outside and it's updated here.
00069                 if (node.parentPtr == Node.NO_NODE) {
00070                         header.rootPtr = node.filePtr;
00071                         // update header
00072                         collectionFile.rewriteNode(header, header.pos);
00073                 }
00074                 return node.filePtr;
00075         }
00076         
00077         public long writeHeader(FODBIndexHeader header) throws IOException, ClassNotFoundException {
00078                 return collectionFile.writeNode(header);
00079         }
00080         
00081         public void rewriteHeader(FODBIndexHeader obj, long pos) throws IOException, ClassNotFoundException  {
00082                 collectionFile.rewriteNode(obj, pos);
00083         }
00084         
00085         public void rewriteNode(Node obj, long pos) throws IOException, ClassNotFoundException  {
00086                 collectionFile.rewriteNode(obj, pos);
00087         }
00088         
00089         public void deleteNode(Node node) throws IOException, ClassNotFoundException  {
00090                 collectionFile.deleteObject(node.filePtr);
00091         }
00092         
00093         public void addIndexPointerToTable(long pointer) throws IOException, ClassNotFoundException  {
00094                 collectionFile.addIndex(pointer);
00095         }
00096         
00097         public long[] readLongPtr(long pos)  throws IOException, ClassNotFoundException  {
00098                 return (long[])collectionFile.readNode(pos);
00099         }
00100         
00101         public long writeLongPtr(long[] ptr) throws IOException, ClassNotFoundException {
00102                 return collectionFile.writeNode(ptr);
00103         }
00104         
00105         public void rewriteLongPtr(long[] obj, long pos) throws IOException, ClassNotFoundException  {
00106                 collectionFile.rewriteNode(obj, pos);
00107         }
00108         
00109         public void deleteLongPtr(long ptr) throws IOException, ClassNotFoundException  {
00110                 collectionFile.deleteObject(ptr);
00111         }
00112 }

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