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1
25
29 package org.jresearch.gossip.configuration;
30
31 import java.io.IOException  ;
32 import java.io.InputStream ;
33 import java.sql.Connection ;
34 import java.sql.PreparedStatement ;
35 import java.sql.ResultSet ;
36 import java.sql.SQLException ;
37 import java.sql.Statement ;
38 import java.util.Locale ;
39 import java.util.Properties ;
40
41 import javax.servlet.ServletContext ;
42 import javax.sql.DataSource ;
43
44 import org.apache.log.Logger;
45 import org.jresearch.gossip.IConst;
46 import org.jresearch.gossip.dao.drivers.DbDriver;
47 import org.jresearch.gossip.exception.ConfiguratorException;
48 import org.jresearch.gossip.exception.SystemException;
49 import org.jresearch.gossip.log.avalon.JGossipLog;
50
51
56 public class Configurator implements IConst {
57
58 private static Configurator ourInstance;
59
60 private static Object lock = new Object ();
61
62 private Properties props;
63
64 private DataSource dataSource;
65
66 private DbDriver dbDriver;
67
68 private Configurator() {
69 this.props = new Properties ();
70 this.dbDriver = DbDriver.getInstance();
71
72 }
73
74
80 public static Configurator getInstance() {
81 if (ourInstance == null) {
82 synchronized (lock) {
83 if (ourInstance == null) {
84 ourInstance = new Configurator();
85 }
86 }
87 }
88
89 return ourInstance;
90 }
91
92
103 public String get(String key) throws ConfiguratorException {
104 if (this.props.getProperty(key) == null) {
105 throw new ConfiguratorException("Parameter by key=" + key
106 + " not found");
107 }
108
109 return this.props.getProperty(key);
110 }
111
112
123 public int getInt(String key) throws ConfiguratorException {
124 if (this.props.getProperty(key) == null) {
125 throw new ConfiguratorException("Parameter by key=" + key
126 + " not found");
127 }
128
129 return Integer.parseInt(this.props.getProperty(key));
130 }
131
132
143 public boolean getBoolean(String key) throws ConfiguratorException {
144 if (this.props.getProperty(key) == null) {
145 throw new ConfiguratorException("Parameter by key=" + key
146 + " not found");
147 }
148
149 return this.props.getProperty(key).equalsIgnoreCase(VALUES.TRUE);
150 }
151
152
157 public Locale getLocale(String key) throws ConfiguratorException {
158 if (this.props.getProperty(key) == null) {
159 throw new ConfiguratorException("Parameter by key=" + key
160 + " not found");
161 }
162
163 return new Locale (this.props.getProperty(key));
164 }
165
166
178 public void load(ServletContext servletContext) throws SQLException ,
179 IOException , SystemException {
180 Logger log = JGossipLog.getInstance().getAppLogger();
181 if (log.isDebugEnabled()) {
182 log.debug("try to load app.properties");
183 }
184
185 InputStream is = servletContext
186 .getResourceAsStream("/WEB-INF/classes/org/jresearch/gossip/resources/app.properties");
187
188 try {
189 this.props.load(is);
190 is.close();
191 } catch (IOException e1) {
192 if (log.isErrorEnabled()) {
193 log.error("Loading of jGossip's configuration failed "
194 + e1.getMessage());
195 }
196
197 throw e1;
198 }
199
200 if (log.isDebugEnabled()) {
201 log.debug("try to load configuration from Data Base");
202 }
203
204 Connection conn = this.dataSource.getConnection();
205
206 PreparedStatement st = conn.prepareStatement(dbDriver.getQueries()
207 .getForumQueries().getSql_GET_CONSTANTS());
208 Statement st2 = conn.createStatement();
209 ResultSet rs = null;
210
211 try {
212 rs = (ResultSet ) st.executeQuery();
213
214 while (rs.next()) {
215 if (log.isDebugEnabled()) {
216 log.debug(rs.getString("c_name") + " is loaded");
217 }
218
219 this.props.put(rs.getString("c_name"), rs.getString("c_value"));
220 }
221
222 st2.executeUpdate(dbDriver.getQueries().getForumQueries()
224 .getSql_DELETE_ALL_ENTRIES());
225 } catch (SQLException e) {
226 if (log.isErrorEnabled()) {
227 log.error("Loading of jGossip's configuration failed "
228 + e.getMessage());
229 }
230
231 throw e;
232 } finally {
233 if (rs != null) {
234 rs.close();
235 }
236
237 st2.close();
238 st.close();
239 conn.close();
240 }
241 }
242
243
252 public void reload(ServletContext servletContext) throws SystemException,
253 SQLException , IOException {
254 this.props = new Properties ();
255 load(servletContext);
256 }
257
258
263 public void setDataSource(DataSource source) {
264 dataSource = source;
265 }
266 }
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