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Java > Open Source Codes > smallsql > database > Columns


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 JavaDoc("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 }
119
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