Source Code Cross Referenced for UserCredentialsDataSourceAdapter.java in  » J2EE » spring-framework-2.5 » org » springframework » jdbc » datasource » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.jdbc.datasource 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.jdbc.datasource;
018:
019:        import java.sql.Connection;
020:        import java.sql.SQLException;
021:
022:        import org.springframework.util.Assert;
023:        import org.springframework.util.StringUtils;
024:
025:        /**
026:         * An adapter for a target JDBC {@link javax.sql.DataSource}, applying the specified
027:         * user credentials to every standard <code>getConnection()</code> call, implicitly
028:         * invoking <code>getConnection(username, password)</code> on the target.
029:         * All other methods simply delegate to the corresponding methods of the
030:         * target DataSource.
031:         *
032:         * <p>Can be used to proxy a target JNDI DataSource that does not have user
033:         * credentials configured. Client code can work with this DataSource as usual,
034:         * using the standard <code>getConnection()</code> call.
035:         *
036:         * <p>In the following example, client code can simply transparently work with
037:         * the preconfigured "myDataSource", implicitly accessing "myTargetDataSource"
038:         * with the specified user credentials.
039:         *
040:         * <pre class="code">
041:         * &lt;bean id="myTargetDataSource" class="org.springframework.jndi.JndiObjectFactoryBean"&gt;
042:         *   &lt;property name="jndiName" value="java:comp/env/jdbc/myds"/&gt;
043:         * &lt;/bean&gt;
044:         *
045:         * &lt;bean id="myDataSource" class="org.springframework.jdbc.datasource.UserCredentialsDataSourceAdapter"&gt;
046:         *   &lt;property name="targetDataSource" ref="myTargetDataSource"/&gt;
047:         *   &lt;property name="username" value="myusername"/&gt;
048:         *   &lt;property name="password" value="mypassword"/&gt;
049:         * &lt;/bean></pre>
050:         *
051:         * <p>If the "username" is empty, this proxy will simply delegate to the
052:         * standard <code>getConnection()</code> method of the target DataSource.
053:         * This can be used to keep a UserCredentialsDataSourceAdapter bean definition
054:         * just for the <i>option</i> of implicitly passing in user credentials if
055:         * the particular target DataSource requires it.
056:         *
057:         * @author Juergen Hoeller
058:         * @since 1.0.2
059:         * @see #getConnection
060:         */
061:        public class UserCredentialsDataSourceAdapter extends
062:                DelegatingDataSource {
063:
064:            private String username;
065:
066:            private String password;
067:
068:            private final ThreadLocal threadBoundCredentials = new ThreadLocal();
069:
070:            /**
071:             * Set the default username that this adapter should use for retrieving Connections.
072:             * <p>Default is no specific user. Note that an explicitly specified username
073:             * will always override any username/password specified at the DataSource level.
074:             * @see #setPassword
075:             * @see #setCredentialsForCurrentThread(String, String)
076:             * @see #getConnection(String, String)
077:             */
078:            public void setUsername(String username) {
079:                this .username = username;
080:            }
081:
082:            /**
083:             * Set the default user's password that this adapter should use for retrieving Connections.
084:             * <p>Default is no specific password. Note that an explicitly specified username
085:             * will always override any username/password specified at the DataSource level.
086:             * @see #setUsername
087:             * @see #setCredentialsForCurrentThread(String, String)
088:             * @see #getConnection(String, String)
089:             */
090:            public void setPassword(String password) {
091:                this .password = password;
092:            }
093:
094:            /**
095:             * Set user credententials for this proxy and the current thread.
096:             * The given username and password will be applied to all subsequent
097:             * <code>getConnection()</code> calls on this DataSource proxy.
098:             * <p>This will override any statically specified user credentials,
099:             * that is, values of the "username" and "password" bean properties.
100:             * @param username the username to apply
101:             * @param password the password to apply
102:             * @see #removeCredentialsFromCurrentThread
103:             */
104:            public void setCredentialsForCurrentThread(String username,
105:                    String password) {
106:                this .threadBoundCredentials.set(new String[] { username,
107:                        password });
108:            }
109:
110:            /**
111:             * Remove any user credentials for this proxy from the current thread.
112:             * Statically specified user credentials apply again afterwards.
113:             * @see #setCredentialsForCurrentThread
114:             */
115:            public void removeCredentialsFromCurrentThread() {
116:                this .threadBoundCredentials.set(null);
117:            }
118:
119:            /**
120:             * Determine whether there are currently thread-bound credentials,
121:             * using them if available, falling back to the statically specified
122:             * username and password (i.e. values of the bean properties) else.
123:             * <p>Delegates to {@link #doGetConnection(String, String)} with the
124:             * determined credentials as parameters.
125:             */
126:            public Connection getConnection() throws SQLException {
127:                String[] threadCredentials = (String[]) this .threadBoundCredentials
128:                        .get();
129:                if (threadCredentials != null) {
130:                    return doGetConnection(threadCredentials[0],
131:                            threadCredentials[1]);
132:                } else {
133:                    return doGetConnection(this .username, this .password);
134:                }
135:            }
136:
137:            /**
138:             * Simply delegates to {@link #doGetConnection(String, String)},
139:             * keeping the given user credentials as-is.
140:             */
141:            public Connection getConnection(String username, String password)
142:                    throws SQLException {
143:                return doGetConnection(username, password);
144:            }
145:
146:            /**
147:             * This implementation delegates to the <code>getConnection(username, password)</code>
148:             * method of the target DataSource, passing in the specified user credentials.
149:             * If the specified username is empty, it will simply delegate to the standard
150:             * <code>getConnection()</code> method of the target DataSource.
151:             * @param username the username to use
152:             * @param password the password to use
153:             * @return the Connection
154:             * @see javax.sql.DataSource#getConnection(String, String)
155:             * @see javax.sql.DataSource#getConnection()
156:             */
157:            protected Connection doGetConnection(String username,
158:                    String password) throws SQLException {
159:                Assert.state(getTargetDataSource() != null,
160:                        "'targetDataSource' is required");
161:                if (StringUtils.hasLength(username)) {
162:                    return getTargetDataSource().getConnection(username,
163:                            password);
164:                } else {
165:                    return getTargetDataSource().getConnection();
166:                }
167:            }
168:
169:        }
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