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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetDataSource.java @ 295:003ae6d881db

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Add "final" keyword to method arguments and local variables where possible. It discovered some bugs in the MonetStatement constructor (changed the argument instead of object variable) which are fixed now. See also https://en.wikipedia.org/wiki/Final_(Java)
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 01 Aug 2019 20:18:43 +0200 (2019-08-01)
parents 2d62ca1f758b
children 54137aeb1f92
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1 /*
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2 * This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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5 *
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2019 MonetDB B.V.
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7 */
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8
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9 package nl.cwi.monetdb.jdbc;
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10
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11 import java.io.PrintWriter;
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12 import java.sql.Connection;
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13 import java.sql.SQLException;
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14 import java.sql.SQLFeatureNotSupportedException;
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15 import javax.sql.DataSource;
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16 import java.util.Properties;
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18 /**
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19 * A DataSource suitable for the MonetDB database.
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20 *
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21 * This DataSource allows retrieval of a Connection using the JNDI bean like
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22 * framework. A DataSource has numerous advantages over using the DriverManager
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23 * to retrieve a Connection object. Using the DataSource interface enables a
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24 * more transparent application where the location or database can be changed
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25 * without changing any application code.
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26 *
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27 * Additionally, pooled connections can be used when using a DataSource.
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28 *
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29 * @author Fabian Groffen
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30 * @version 0.2
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31 */
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32 public final class MonetDataSource
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33 extends MonetWrapper
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34 implements DataSource
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35 {
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36 private String description;
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37 private int loginTimeout = 0;
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38 private String user;
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39 // insecure, but how to do it better?
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40 private String password;
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41 private String url;
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42
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43 // the following properties are also standard:
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44 // private String dataSourceName;
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45 // private String networkProtocol;
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46 // private String serverName;
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47 // private String role;
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49
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50 private final MonetDriver driver;
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51
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52 /**
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53 * Constructor of a MonetDataSource which uses default settings for a
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54 * connection. You probably want to change this setting using the
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55 * method setURL.
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56 */
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57 public MonetDataSource() {
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58 description = "MonetDB database";
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59 url = "jdbc:monetdb://localhost/";
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60
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61 driver = new MonetDriver();
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62 }
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63
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64 /**
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65 * Attempts to establish a connection with the data source that this
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66 * DataSource object represents.
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67 *
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68 * @return a MonetConnection
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69 * @throws SQLException if connecting to the database fails
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70 */
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71 @Override
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72 public Connection getConnection() throws SQLException {
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73 return getConnection(user, password);
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74 }
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75
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76 /**
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77 * Attempts to establish a connection with the data source that this
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78 * DataSource object represents.
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79 *
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80 * @param username the username to use
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81 * @param password the password to use
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82 * @return a MonetConnection
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83 * @throws SQLException if connecting to the database fails
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84 */
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85 @Override
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86 public Connection getConnection(final String username, final String password)
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87 throws SQLException
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88 {
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89 if (loginTimeout > 0) {
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90 /// could enable Socket.setSoTimeout(int timeout) here...
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91 }
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92 final Properties props = new Properties();
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93 props.put("user", username);
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94 props.put("password", password);
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95
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96 return driver.connect(url, props);
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97 }
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99
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100 /**
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101 * Gets the maximum time in seconds that this data source can wait while
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102 * attempting to connect to a database.
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103 *
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104 * @return login timeout default is 0 (infinite)
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105 */
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106 @Override
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107 public int getLoginTimeout() {
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108 return loginTimeout;
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109 }
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110
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111 /**
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112 * Sets the maximum time in seconds that this data source will wait while
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113 * attempting to connect to a database.
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114 *
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115 * @param seconds the number of seconds to wait before aborting the connect
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116 */
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117 @Override
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118 public void setLoginTimeout(final int seconds) {
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119 loginTimeout = seconds;
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120 }
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121
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122 /**
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123 * Retrieves the log writer for this DataSource object.
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124 *
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125 * @return null, since there is no log writer
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126 */
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127 @Override
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128 public PrintWriter getLogWriter() {
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129 return null;
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130 }
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131
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132 /**
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133 * Sets the log writer for this DataSource object to the given
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134 * java.io.PrintWriter object.
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135 *
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136 * @param out a PrintWriter - ignored
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137 */
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138 @Override
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139 public void setLogWriter(final PrintWriter out) {
0
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140 }
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141
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142 /**
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143 * Sets the password to use when connecting. There is no getter
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144 * for obvious reasons.
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145 *
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146 * @param password the password
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147 */
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148 public void setPassword(final String password) {
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149 this.password = password;
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150 }
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151
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152 /**
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153 * Gets the username
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154 *
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155 * @return the username
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156 */
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157 public String getUser() {
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158 return user;
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159 }
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160
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161 /**
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162 * Sets the username
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163 *
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164 * @param user the username
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165 */
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166 public void setUser(final String user) {
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167 this.user = user;
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168 }
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169
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170 /**
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171 * Gets the connection URL
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172 *
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173 * @return the connection URL
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174 */
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175 public String getURL() {
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176 return url;
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177 }
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178
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179 /**
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180 * Sets the connection URL
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181 *
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182 * @param url the connection URL
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183 */
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184 public void setDatabaseName(final String url) {
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185 this.url = url;
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186 }
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187
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188 /**
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189 * Gets the description
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190 *
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191 * @return the description
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192 */
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193 public String getDescription() {
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194 return description;
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195 }
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196
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197 /**
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198 * Sets the description
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199 *
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200 * @param description the description
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201 */
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202 public void setDescription(final String description) {
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203 this.description = description;
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204 }
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205
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206 /**
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207 * Return the parent Logger of all the Loggers used by this data
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208 * source. This should be the Logger farthest from the root Logger
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209 * that is still an ancestor of all of the Loggers used by this data
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210 * source. Configuring this Logger will affect all of the log
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211 * messages generated by the data source. In the worst case, this
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212 * may be the root Logger.
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213 *
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214 * @return the parent Logger for this data source
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215 * @throws SQLFeatureNotSupportedException if the data source does
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216 * not use java.util.logging
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217 */
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218 @Override
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219 public java.util.logging.Logger getParentLogger() throws SQLFeatureNotSupportedException {
262
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220 throw newSQLFeatureNotSupportedException("getParentLogger");
0
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221 }
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222 }