1 /*
2 * $Source$
3 * $Revision$
4 *
5 * Copyright (C) 2000 Chris Kimpton
6 *
7 * Part of Melati (http://melati.org), a framework for the rapid
8 * development of clean, maintainable web applications.
9 *
10 * Melati is free software; Permission is granted to copy, distribute
11 * and/or modify this software under the terms either:
12 *
13 * a) the GNU General Public License as published by the Free Software
14 * Foundation; either version 2 of the License, or (at your option)
15 * any later version,
16 *
17 * or
18 *
19 * b) any version of the Melati Software License, as published
20 * at http://melati.org
21 *
22 * You should have received a copy of the GNU General Public License and
23 * the Melati Software License along with this program;
24 * if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
26 * GNU General Public License and visit http://melati.org to obtain the
27 * Melati Software License.
28 *
29 * Feel free to contact the Developers of Melati (http://melati.org),
30 * if you would like to work out a different arrangement than the options
31 * outlined here. It is our intention to allow Melati to be used by as
32 * wide an audience as possible.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * Contact details for copyright holder:
40 *
41 * Chris Kimpton (kimtoc@techie.com)
42 *
43 */
44 package org.melati.poem.odmg;
45
46 import java.util.Map;
47 import java.util.HashMap;
48
49 import org.melati.LogicalDatabase;
50 import org.melati.util.DatabaseInitException;
51
52 /** POEM implementation of the ODMG Database API. **/
53 final class Database implements org.odmg.Database {
54
55 /** Hide this from general use. **/
56 private Database() {}
57
58 /** Provide a package factory method
59 so we could return a different type if needed. **/
60 static Database getNewDatabase() {
61 return new Database();
62 }
63
64 private org.melati.poem.Database _poemDB = null;
65 private String _logicalDB = null;
66
67 org.melati.poem.Database getPoemDatabase()
68 throws org.odmg.ODMGRuntimeException {
69 if (_poemDB == null) throw new org.odmg.DatabaseClosedException(
70 "org.melati.poem.odmg.Database::getPoemDatabase - POEM DB not set");
71 return _poemDB;
72 }
73
74 /** Opens a connection to the db
75 * @param openParameters the Poem logical db name
76 */
77 public void open(String openParameters, int openType)
78 throws org.odmg.ODMGException {
79 _logicalDB = openParameters;
80 try {
81 _poemDB = LogicalDatabase.getDatabase(_logicalDB);
82 _cachedTables = new HashMap<String,PoemTableAsDCollection<?>>();
83 } catch (DatabaseInitException err) {
84 err.printStackTrace();
85 throw new org.odmg.ODMGException(err.getMessage());
86 }
87 }
88
89 public void close() {
90 _poemDB.disconnect();
91 _poemDB = null;
92 _cachedTables = null;
93 ODMGFactory.resetDb();
94 }
95
96 private Map<String,PoemTableAsDCollection<?>> _cachedTables = null;
97
98 /**
99 * Retrieves a collection wrapper for the selected table.
100 *
101 * @param objectIdentifier the name of the table for which a collection
102 * is required
103 **/
104 @SuppressWarnings({ "unchecked", "rawtypes" })
105 public Object lookup(String objectIdentifier)
106 throws org.odmg.ObjectNameNotFoundException {
107 if (_poemDB == null) throw new org.odmg.DatabaseClosedException();
108 PoemTableAsDCollection<?> theObject = _cachedTables.get(objectIdentifier);
109 if (theObject == null) {
110 theObject = new PoemTableAsDCollection(_poemDB.
111 getTable(objectIdentifier));
112 _cachedTables.put(objectIdentifier,theObject);
113 }
114 return theObject;
115 }
116
117 /** Not supported with the Poem / ODMG wrapper **/
118 public void makePersistent(Object objectToBePersistent) {
119 throw new org.odmg.NotImplementedException();
120 }
121 /** Not supported with the Poem / ODMG wrapper **/
122 public void deletePersistent(Object persistedObject) {
123 throw new org.odmg.NotImplementedException();
124 }
125 /** Not supported with the Poem / ODMG wrapper **/
126 public void bind(Object objectToBePersistent, String objectIdentifier) {
127 throw new org.odmg.NotImplementedException();
128 }
129 /** Not supported with the Poem / ODMG wrapper **/
130 public void unbind(String objectIdentifier) {
131 throw new org.odmg.NotImplementedException();
132 }
133
134 }
135