FODBUniqueIntIndex.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.index;
00030 
00031 import java.io.IOException;
00032 import java.lang.reflect.*;
00033 
00034 import org.openmobileis.common.util.collection.LongArray;
00035 import org.openmobileis.database.fastobjectdb.FODBIntIndexDescriptor;
00036 import org.openmobileis.database.fastobjectdb.db.exception.FODBException;
00037 import org.openmobileis.database.fastobjectdb.db.index.node.IntNode;
00038 import org.openmobileis.database.fastobjectdb.db.index.node.Node;
00039 import org.openmobileis.database.fastobjectdb.db.query.soda.BaseConstraint;
00040 import org.openmobileis.database.fastobjectdb.db.query.soda.SodaIntIndexComparator;
00041 import org.openmobileis.database.fastobjectdb.db.store.FODBCollectionIndexFile;
00042 
00045 public class FODBUniqueIntIndex extends FODBIntIndex implements FODBUniqueIndex {
00046 
00047         public FODBUniqueIntIndex(FODBIndexHeader newHeader, FODBCollectionIndexFile cFile, AccessibleObject accObj) throws FODBException {
00048                 super(newHeader, cFile, accObj);
00049         }
00050         
00051         public FODBUniqueIntIndex(FODBIntIndexDescriptor descriptor, FODBCollectionIndexFile cFile, AccessibleObject accObj) throws FODBException {
00052                 super(descriptor, cFile, accObj);
00053         }
00054 
00055         /* (non-Javadoc)
00056          * @see org.openmobileis.embedded.fastobjectdb.db.FODBIndex#getType()
00057          */
00058         public int getType() {
00059                 return FODBIndex.UNIQUE;
00060         }
00061 
00062         protected void writeKeyPtr(Node node, int pos, long newptr) throws IOException, ClassNotFoundException {
00063                 throw new IOException("rewrite unique String  index Ptr not allowed");
00064         }
00065         
00066         protected void addSearchResult(IntNode pg, int pos, LongArray array) throws IOException, ClassNotFoundException {
00067                 array.add(pg.ptr[pos]);
00068         }
00069         
00070         public long getKeyPosition(Object keytosearch) throws FODBException {
00071                 if (keytosearch == null) {
00072                         return Node.NO_NODE;
00073                 }
00074                 if (!(keytosearch instanceof Integer))  {
00075                         throw new FODBException("Key type in getKeyPosition for IntUniqueIndex");
00076                 }
00077                 int key = ((Integer)keytosearch).intValue();
00078 
00079                 try     {
00080                         SodaIntIndexComparator comparator = new SodaIntIndexComparator();
00081                         comparator.setOperand(new Integer(key));
00082                         comparator.addComparator(BaseConstraint.EQUALS);
00083                         long preResult[] = this.query(comparator);
00084         
00085                         if (preResult == null) { // Shouldn't happen !
00086                                 throw new FODBException("Internal error !!!");
00087                         }
00088                         if (preResult.length > 1) { // Shouldn't happen in a UniqueIndex
00089                                 throw new FODBException("Internal error !!!");
00090                         }
00091                         
00092                         if (preResult.length == 0) {
00093                                 return Node.NO_NODE;
00094                         }
00095                         
00096                         // If we got there, then we had ONE result, has expected
00097                         return preResult[0];
00098                 } catch (Throwable ex)  {
00099                         throw new FODBException(ex);
00100                 }
00101         }
00102         
00103         protected boolean removeKeyPtr(Node pg, int pos, long pointer) throws IOException, ClassNotFoundException {
00104                 return true;
00105         }
00106 
00107 }

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