| 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 | * Columns.java |
| 29 | * --------------- |
| 30 | * Author: Volker Berlin |
| 31 | * |
| 32 | */ |
| 33 | package smallsql.database; |
| 34 | |
| 35 | /** |
| 36 | * A typed implementation of Arraylist for Column. |
| 37 | * This list is used to descript the meta data of a ResultSet and to descript a Table. |
| 38 | * |
| 39 | * @author Volker Berlin |
| 40 | * |
| 41 | */ |
| 42 | final class Columns { |
| 43 | private int size; |
| 44 | private Column[] data; |
| 45 | |
| 46 | Columns(){ |
| 47 | data = new Column[16]; |
| 48 | } |
| 49 | |
| 50 | /*Columns(int initSize){ |
| 51 | data = new Column[initSize]; |
| 52 | }*/ |
| 53 | |
| 54 | final int size(){ |
| 55 | return size; |
| 56 | } |
| 57 | |
| 58 | final Column get(int idx){ |
| 59 | if (idx >= size) |
| 60 | throw new IndexOutOfBoundsException("Column index: "+idx+", Size: "+size); |
| 61 | return data[idx]; |
| 62 | } |
| 63 | |
| 64 | final void add(Column expr){ |
| 65 | if(size >= data.length ){ |
| 66 | resize(size << 1); |
| 67 | } |
| 68 | data[size++] = expr; |
| 69 | } |
| 70 | |
| 71 | /*final void add(int idx, Column expr){ |
| 72 | if(size >= data.length ){ |
| 73 | resize(size << 1); |
| 74 | } |
| 75 | System.arraycopy( data, idx, data, idx+1, (size++)-idx); |
| 76 | data[idx] = expr; |
| 77 | } |
| 78 | |
| 79 | final void addAll(Columns cols){ |
| 80 | int count = cols.size(); |
| 81 | if(size + count >= data.length ){ |
| 82 | resize(size + count); |
| 83 | } |
| 84 | System.arraycopy( cols.data, 0, data, size, count); |
| 85 | size += count; |
| 86 | } |
| 87 | |
| 88 | final void clear(){ |
| 89 | size = 0; |
| 90 | } |
| 91 | |
| 92 | final void remove(int idx){ |
| 93 | System.arraycopy( data, idx+1, data, idx, (--size)-idx); |
| 94 | }*/ |
| 95 | |
| 96 | /*final void set(int idx, Column expr){ |
| 97 | data[idx] = expr; |
| 98 | } |
| 99 | |
| 100 | final int indexOf(Column expr) { |
| 101 | if (expr == null) { |
| 102 | for (int i = 0; i < size; i++) |
| 103 | if (data[i]==null) |
| 104 | return i; |
| 105 | } else { |
| 106 | for (int i = 0; i < size; i++) |
| 107 | if (expr.equals(data[i])) |
| 108 | return i; |
| 109 | } |
| 110 | return -1; |
| 111 | }*/ |
| 112 | |
| 113 | private final void resize(int newSize){ |
| 114 | Column[] dataNew = new Column[newSize]; |
| 115 | System.arraycopy(data, 0, dataNew, 0, size); |
| 116 | data = dataNew; |
| 117 | } |
| 118 | } |