Source Code Cross Referenced for DatabaseLink.java in  » Database-DBMS » axion » org » axiondb » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » axion » org.axiondb 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: DatabaseLink.java,v 1.4 2005/06/30 01:07:47 ahimanikya Exp $
003:         * =======================================================================
004:         * Copyright (c) 2004 Axion Development Team.  All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         *
010:         * 1. Redistributions of source code must retain the above
011:         *    copyright notice, this list of conditions and the following
012:         *    disclaimer.
013:         *
014:         * 2. Redistributions in binary form must reproduce the above copyright
015:         *    notice, this list of conditions and the following disclaimer in
016:         *    the documentation and/or other materials provided with the
017:         *    distribution.
018:         *
019:         * 3. The names "Tigris", "Axion", nor the names of its contributors may
020:         *    not be used to endorse or promote products derived from this
021:         *    software without specific prior written permission.
022:         *
023:         * 4. Products derived from this software may not be called "Axion", nor
024:         *    may "Tigris" or "Axion" appear in their names without specific prior
025:         *    written permission.
026:         *
027:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
028:         * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
029:         * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
030:         * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
031:         * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
032:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
033:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
034:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
035:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
036:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
037:         * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
038:         * =======================================================================
039:         */
040:
041:        package org.axiondb;
042:
043:        import java.sql.Connection;
044:        import java.sql.DriverManager;
045:        import java.sql.SQLException;
046:        import java.util.Properties;
047:
048:        /**
049:         * A Database Link that holds connection spec for a external Database <code>
050:         * CREATE DATABASE LINK
051:         * <name>(DRIVER=' <driver class name, e.g., oracle.jdbc.OracleDriver>' URL='
052:         * <DB-specific URL, e.g., jdbc:oracle:thin:@db1:1521:db1>' USERNAME=' <username>'
053:         * PASSWORD=' <password>');
054:         * </code>
055:         *
056:         * @version $Revision: 1.4 $ $Date: 2005/06/30 01:07:47 $
057:         * @author Ahimanikya Satapathy
058:         */
059:        public class DatabaseLink {
060:            /**
061:             * Create an External Server
062:             */
063:            public DatabaseLink(String name, Properties spec) {
064:                _name = name;
065:                _connProvider = getExternalConnectionProvider();
066:                _connSpec = spec;
067:
068:                _driverClass = spec
069:                        .getProperty(ExternalConnectionProvider.PROP_DRIVERCLASS);
070:                _jdbcUrl = spec
071:                        .getProperty(ExternalConnectionProvider.PROP_JDBCURL);
072:                _userName = spec
073:                        .getProperty(ExternalConnectionProvider.PROP_USERNAME);
074:                _password = spec
075:                        .getProperty(ExternalConnectionProvider.PROP_PASSWORD);
076:
077:                _catalogName = spec
078:                        .getProperty(ExternalConnectionProvider.PROP_CATALOG);
079:                _schemaName = spec
080:                        .getProperty(ExternalConnectionProvider.PROP_SCHEMA);
081:
082:                if ((_connProvider == null)
083:                        && (_driverClass == null
084:                                || _driverClass.trim().length() == 0
085:                                || _jdbcUrl == null
086:                                || _jdbcUrl.trim().length() == 0
087:                                || _userName == null
088:                                || _userName.trim().length() == 0 || _password == null)) {
089:                    throw new IllegalArgumentException(
090:                            "Missing required connection properties.");
091:                }
092:            }
093:
094:            private ExternalConnectionProvider getExternalConnectionProvider() {
095:                Object connectionProvider = null;
096:                String externalConnectionProvider = System
097:                        .getProperty(ExternalConnectionProvider.EXTERNAL_CONNECTION_PROVIDER_PROPERTY_NAME);
098:
099:                if (externalConnectionProvider != null
100:                        && !externalConnectionProvider.trim().equals("")) {
101:                    try {
102:                        connectionProvider = Class.forName(
103:                                externalConnectionProvider).newInstance();
104:                    } catch (Exception e) {
105:                        // ignore for now
106:                    }
107:                }
108:                return (ExternalConnectionProvider) connectionProvider;
109:            }
110:
111:            public Connection getConnection() throws AxionException {
112:                Connection conn = null;
113:                try {
114:                    if (_connProvider == null) {
115:                        Class.forName(_driverClass);
116:                        conn = DriverManager.getConnection(_jdbcUrl, _userName,
117:                                _password);
118:                    } else {
119:                        conn = _connProvider.getConnection(_connSpec);
120:                    }
121:                    conn.setAutoCommit(false);
122:                } catch (ClassNotFoundException e) {
123:                    throw new AxionException(
124:                            "Could not locate class for driver: "
125:                                    + _driverClass);
126:                } catch (SQLException e) {
127:                    throw new AxionException(
128:                            "Could not connect to database for URL: "
129:                                    + _jdbcUrl, e);
130:                }
131:                return conn;
132:            }
133:
134:            /**
135:             * Get the name of this database link.
136:             */
137:            public String getName() {
138:                return _name;
139:            }
140:
141:            /**
142:             * @return Returns the _catalogName.
143:             */
144:            public String getCatalogName() {
145:                return _catalogName;
146:            }
147:
148:            /**
149:             * @return Returns the _schemaName.
150:             */
151:            public String getSchemaName() {
152:                return _schemaName;
153:            }
154:
155:            /**
156:             * @return JDBC URL to use in connecting to the associated server
157:             */
158:            public String getJdbcUrl() {
159:                return _jdbcUrl;
160:            }
161:
162:            /**
163:             * @return user name to authenticate against in connecting to associated server
164:             */
165:            public String getUserName() {
166:                return _userName;
167:            }
168:
169:            private String _name = null;
170:            private String _driverClass = null;
171:            private String _jdbcUrl;
172:            private String _userName;
173:            private String _password;
174:            private String _catalogName;
175:            private String _schemaName;
176:            private Properties _connSpec;
177:            private ExternalConnectionProvider _connProvider;
178:
179:        }
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