| 1 | /* ============================================================= |
| 2 | * SmallSQL : a free Java DBMS library for the Java(tm) platform |
| 3 | * ============================================================= |
| 4 | * |
| 5 | * (C) Copyright 2004-2006, by Volker Berlin. |
| 6 | * |
| 7 | * Project Info: http://www.smallsql.de/ |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU Lesser General Public License as published by |
| 11 | * the Free Software Foundation; either version 2.1 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 16 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| 17 | * License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
| 22 | * USA. |
| 23 | * |
| 24 | * [Java is a trademark or registered trademark of Sun Microsystems, Inc. |
| 25 | * in the United States and other countries.] |
| 26 | * |
| 27 | * --------------- |
| 28 | * StoreNull.java |
| 29 | * --------------- |
| 30 | * Author: Volker Berlin |
| 31 | * |
| 32 | */ |
| 33 | package smallsql.database; |
| 34 | |
| 35 | import java.sql.*; |
| 36 | |
| 37 | /* |
| 38 | * @author Volker Berlin |
| 39 | * |
| 40 | * This class is a implementation of the STore that returns only null. |
| 41 | * This is used for OUTER JOIN to return null values for tables with no |
| 42 | * row position. |
| 43 | * |
| 44 | */ |
| 45 | class StoreNull extends Store { |
| 46 | |
| 47 | private final long nextPagePos; |
| 48 | |
| 49 | |
| 50 | StoreNull(){ |
| 51 | this(-1); |
| 52 | } |
| 53 | |
| 54 | |
| 55 | StoreNull(long nextPos){ |
| 56 | nextPagePos = nextPos; |
| 57 | } |
| 58 | |
| 59 | |
| 60 | final boolean isNull(int offset) { |
| 61 | return true; |
| 62 | } |
| 63 | |
| 64 | final boolean getBoolean(int offset, int dataType) throws Exception { |
| 65 | return false; |
| 66 | } |
| 67 | |
| 68 | final byte[] getBytes(int offset, int dataType) throws Exception { |
| 69 | return null; |
| 70 | } |
| 71 | |
| 72 | |
| 73 | final double getDouble(int offset, int dataType) throws Exception { |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | |
| 78 | final float getFloat(int offset, int dataType) throws Exception { |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | |
| 83 | final int getInt(int offset, int dataType) throws Exception { |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | |
| 88 | final long getLong(int offset, int dataType) throws Exception { |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | |
| 93 | final long getMoney(int offset, int dataType) throws Exception { |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | |
| 98 | final MutableNumeric getNumeric(int offset, int dataType) throws Exception { |
| 99 | return null; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | final Object getObject(int offset, int dataType) throws Exception { |
| 104 | return null; |
| 105 | } |
| 106 | |
| 107 | |
| 108 | final String getString(int offset, int dataType) throws Exception { |
| 109 | return null; |
| 110 | } |
| 111 | |
| 112 | |
| 113 | |
| 114 | final void scanObjectOffsets(int[] offsets, int[] dataTypes) { |
| 115 | } |
| 116 | |
| 117 | |
| 118 | final int getUsedSize() { |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | final long getNextPagePos(){ |
| 123 | return nextPagePos; |
| 124 | } |
| 125 | |
| 126 | final void deleteRow(SSConnection con) throws SQLException{ |
| 127 | if(nextPagePos >= 0){ |
| 128 | throw Utils.createSQLException("Row allready deleted."); |
| 129 | } |
| 130 | //TODO |
| 131 | throw new Error(); |
| 132 | } |
| 133 | } |