Source Code Cross Referenced for JNDIHelper.java in  » Workflow-Engines » obe-1.0 » org » obe » client » api » rmi » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » obe 1.0 » org.obe.client.api.rmi 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*--
002:
003:         Copyright (C) 2002-2005 Adrian Price.
004:         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 copyright
011:            notice, this list of conditions, and the following disclaimer.
012:
013:         2. Redistributions in binary form must reproduce the above copyright
014:            notice, this list of conditions, and the disclaimer that follows
015:            these conditions in the documentation and/or other materials
016:            provided with the distribution.
017:
018:         3. The names "OBE" and "Open Business Engine" must not be used to
019:         	endorse or promote products derived from this software without prior
020:         	written permission.  For written permission, please contact
021:         	adrianprice@sourceforge.net.
022:
023:         4. Products derived from this software may not be called "OBE" or
024:         	"Open Business Engine", nor may "OBE" or "Open Business Engine"
025:         	appear in their name, without prior written permission from
026:         	Adrian Price (adrianprice@users.sourceforge.net).
027:
028:         THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
029:         WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
030:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
031:         DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
032:         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
033:         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
034:         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
035:         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
036:         STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
037:         IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
038:         POSSIBILITY OF SUCH DAMAGE.
039:
040:         For more information on OBE, please see
041:         <http://obe.sourceforge.net/>.
042:
043:         */
044:
045:        package org.obe.client.api.rmi;
046:
047:        import org.obe.client.api.ClientConfig;
048:
049:        import javax.naming.Context;
050:        import javax.naming.InitialContext;
051:        import javax.naming.NamingException;
052:        import javax.sql.DataSource;
053:        import java.util.Hashtable;
054:
055:        /**
056:         * This class can be used for remote access to the JNDI tree.
057:         *
058:         * @author Adrian Price
059:         */
060:        public final class JNDIHelper {
061:            // OBE EJBs all refer to their data source by this environment name.
062:            public static final String EJB_DATA_SOURCE = "java:comp/env/jdbc/TxDataSource";
063:            // This is the external JNDI name for OBE's data source.
064:            public static final String DEFAULT_DATA_SOURCE = "java:/org/obe/jdbc/DataSource";
065:
066:            /**
067:             * This method can be used from a J2EE server.
068:             *
069:             * @return Context
070:             * @throws NamingException
071:             */
072:            public static InitialContext getInitialContext()
073:                    throws NamingException {
074:                return getInitialContext(null, null, null);
075:            }
076:
077:            /**
078:             * This method allows access to different URLs, but with the default
079:             * username.
080:             *
081:             * @param url Server URL.
082:             * @return A JNDI InitialContext object.
083:             * @throws NamingException
084:             */
085:            public static InitialContext getInitialContext(String url)
086:                    throws NamingException {
087:
088:                return getInitialContext(url, null, null);
089:            }
090:
091:            /**
092:             * This method is used on the server when a new username is needed for the
093:             * JNDI context.
094:             *
095:             * @param username
096:             * @param credentials
097:             * @return Context
098:             * @throws NamingException
099:             */
100:            public static InitialContext getInitialContext(String username,
101:                    Object credentials) throws NamingException {
102:
103:                return getInitialContext(null, username, credentials);
104:            }
105:
106:            /**
107:             * This method allows client code to specify URL and credentials with which
108:             * to connect. <em>N.B. The caller must close the returned context.</em>
109:             *
110:             * @param url
111:             * @param username
112:             * @param credentials
113:             * @return A InitialContext object.
114:             * @throws NamingException
115:             */
116:            public static InitialContext getInitialContext(String url,
117:                    String username, Object credentials) throws NamingException {
118:
119:                Hashtable h = new Hashtable();
120:
121:                // Under some circumstances it can be necessary to override the default
122:                // JNDI initial context factory.  For example, certain RPC tunnelling
123:                // protocols wrap default JNDI objects with their own marshalling
124:                // mechanism.
125:                String icfOverride = ClientConfig
126:                        .getJNDIInitialContextFactoryClass();
127:                if (icfOverride != null)
128:                    h.put(Context.INITIAL_CONTEXT_FACTORY, icfOverride);
129:
130:                if (url != null)
131:                    h.put(Context.PROVIDER_URL, url);
132:
133:                if (username != null) {
134:                    h.put(Context.SECURITY_PRINCIPAL, username);
135:
136:                    if (credentials != null)
137:                        h.put(Context.SECURITY_CREDENTIALS, credentials);
138:                }
139:
140:                return new InitialContext(h);
141:            }
142:
143:            /**
144:             * This method returns a DataSource object from JNDI.
145:             *
146:             * @param name Name of the DataSource object
147:             * @param ctx  JNDI Context.
148:             * @return DataSource object from JNDI
149:             * @throws NamingException
150:             */
151:            public static DataSource getDataSource(String name, Context ctx)
152:                    throws NamingException {
153:
154:                return (DataSource) ctx.lookup(name);
155:            }
156:
157:            /**
158:             * This method returns a DataSource object from JNDI. This method will open
159:             * and close a temporary JNDI context.
160:             *
161:             * @param name Name of the DataSource object
162:             * @return DataSource object from JNDI
163:             * @throws NamingException
164:             */
165:            public static DataSource getDataSource(String name)
166:                    throws NamingException {
167:                Context ctx = getInitialContext();
168:                try {
169:                    return getDataSource(name, ctx);
170:                } finally {
171:                    ctx.close();
172:                }
173:            }
174:
175:            // Do not instantiate this class.
176:            private JNDIHelper() {
177:            }
178:        }
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