geotools/io/DbServerSettings.java

package skrueger.geotools.io;

import java.awt.Component;
import java.net.MalformedURLException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.regex.Pattern;

import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.geotools.data.postgis.PostgisNGDataStoreFactory;
import org.geotools.jdbc.JDBCDataStore;
import org.geotools.jdbc.JDBCDataStoreFactory;
import org.jfree.util.Log;

import schmitzm.swing.BooleanInputOption;
import schmitzm.swing.ManualInputOption;
import schmitzm.swing.ManualInputOption.Integer;
import schmitzm.swing.ManualInputOption.PasswordViewable;
import schmitzm.swing.ManualInputOption.Text;
import schmitzm.swing.MultipleOptionPane;
import schmitzm.swing.SelectionInputOption;
import schmitzm.swing.SelectionInputOption.Combo;
import skrueger.db.PGUtil;

/**
 * This class describes all settings needed to connect to a WFS server. This
 * class extends a {@link HashMap} and contains two groups of keys:<br/>
 * The first group of keys, are all keys provided by Geotools to create a WFS
 * datastore, like: {@link JDBCDataStore#SCHEMA} .<br/>
 * The second group are additional keys defined in the enum
 * {@link DbServerSettings.Key}.<br/>
 * This class can serialize all important parameters needed to define the
 * connection into a {@link String} with {@link #toPropertiesString()} and
 * re-import the String with {@link #parsePropertiesString(String)}.
 */
public class DbServerSettings extends ServerSettings<Object, Object> {

        Logger log = Logger.getLogger(DbServerSettings.class);

        public enum DbType {
                postgis("postgresql");

                private final String protocolString;

                DbType(String protocolString) {
                        this.protocolString = protocolString;
                }

                public String getProtocolString() {
                        return protocolString;
                };
        }

        /**
         * params.put(JDBCDataStoreFactory.DBTYPE.key, "postgis");
         * params.put(JDBCDataStoreFactory.HOST.key, host); // the name or ip
         * params.put(JDBCDataStoreFactory.PORT.key, port); // the port that
         * 
         * params.put(JDBCDataStoreFactory.DATABASE.key, database); // the
         * 
         * // name params.put(JDBCDataStoreFactory.USER.key, username); // the user
         * to params.put(JDBCDataStoreFactory.PASSWD.key, password); // the
         * 
         * params.put(JDBCDataStoreFactory.SCHEMA, schema);
         * 
         * params.put(JDBCDataStoreFactory.EXPOSE_PK.key, true); *
         */

        public enum Key {
        }

        private static Connection dbc;

        /**
         * Opens a GUI that asks the use define a DB connection.
         * 
         * @param dbServer
         *            <code>null</code> to create a new instance, or an instance to
         *            edit.
         * @return <code>null</code> if the user cancelled the creation of a new
         *         {@link DbServerSettings}, otherwise the edited instance.
         */
        public static DbServerSettings createOrEdit(Component owner,
                        DbServerSettings dbServer) {
                boolean newCreated = false;

                if (dbServer == null) {
                        newCreated = true;
                        dbServer = new DbServerSettings(DbType.postgis);
                }

                Combo<DbType> dpTypeInput = new SelectionInputOption.Combo<DbType>(
                                "Database type", true, DbType.values(), ArrayUtils.indexOf(
                                                DbType.values(), dbServer.getDbType()), DbType.values());

                Text hostInput = new ManualInputOption.Text("Hostname", true,
                                dbServer.getHost());

                Integer portInput = new ManualInputOption.Integer("Port", true,
                                dbServer.getPort());

                Text databaseInput = new ManualInputOption.Text("Database", true,
                                dbServer.getDatabase());

                Text schemaInput = new ManualInputOption.Text("Schema", true,
                                dbServer.getSchema());

                Text userInput = new ManualInputOption.Text("Username", true,
                                dbServer.getUsername());

                PasswordViewable passwdInput = new ManualInputOption.PasswordViewable(
                                "Password", true, dbServer.getPassword());

                BooleanInputOption exposePkInput = new BooleanInputOption(
                                "Expose primary keys", dbServer.getExposePrimaryKey());

                Object[] input = MultipleOptionPane.showMultipleInputDialog(owner,
                                "DB Connection paramters", dpTypeInput, hostInput, portInput,
                                databaseInput, schemaInput, userInput, passwdInput,
                                exposePkInput);

                if (input == null) {
                        if (newCreated)
                                return null;
                        else
                                return dbServer;
                } else {
                        dbServer.setDbType((DbType) input[0]);
                        dbServer.setHost((String) input[1]);
                        dbServer.setPort((java.lang.Integer) input[2]);
                        dbServer.setDatabase((String) input[3]);
                        dbServer.setSchema((String) input[4]);
                        dbServer.setUsername((String) input[5]);
                        dbServer.setPassword(String.valueOf((char[]) input[6]));
                        dbServer.setExposePrimaryKey((Boolean) input[7]);
                }

                return dbServer;

        }

        /**
         * @return transforms the settings to a String that can be stored in a
         *         .properties line. @see #parsePropertiesString
         * @throws MalformedURLException
         */
        public static DbServerSettings parsePropertiesString(String propString)
                        throws MalformedURLException {

                if (propString == null || propString.isEmpty())
                        throw new IllegalArgumentException("parameter to parse was empty");
                try {

                        String[] split = propString.split(Pattern.quote(DELIMITER));

                        int i = 0;
                        DbServerSettings dbServer = new DbServerSettings(
                                        DbType.valueOf(split[i++]));

                        dbServer.setTitle(split[i++]);
                        dbServer.setHost(split[i++]);
                        dbServer.setPort(java.lang.Integer.valueOf(split[i++]));
                        dbServer.setUsername(StringUtils.stripToNull(split[i++]));
                        dbServer.setPassword(split[i++]);
                        dbServer.setDatabase(split[i++]);
                        dbServer.setExposePrimaryKey(Boolean.valueOf(split[i++]));
                        dbServer.setSchema(stringOrNull(split[i++]));

                        return dbServer;
                } catch (Exception e) {
                        Log.warn("couldn't parse " + propString, e);
                        return null;
                }
        }

        private String[] cachedTypeNames = null;
        private String[] cachedGeometryTableNames;

        public DbServerSettings() {
                this(DbType.postgis);
        }

        public DbServerSettings(DbType dbType) {
                setDbType(dbType);
                setHost("localhost");
                setSchema("public");
                put(JDBCDataStoreFactory.PK_METADATA_TABLE.key, null);
        }

        public String[] getCachedTypeNames() {
                return cachedTypeNames;
        }

        public String getDatabase() {
                return (String) get(JDBCDataStoreFactory.DATABASE.key);
        }

        public DbType getDbType() {
                String dbt = (String) get(PostgisNGDataStoreFactory.DBTYPE.key);
                if (dbt != null)
                        return DbType.valueOf(dbt);
                return null;
        }

        public Boolean getExposePrimaryKey() {
                Boolean expk = (Boolean) get(JDBCDataStoreFactory.EXPOSE_PK.key);
                if (expk == null)
                        return (Boolean) JDBCDataStoreFactory.EXPOSE_PK.sample;
                return expk;
        }

        public String getHost() {
                return (String) get(JDBCDataStoreFactory.HOST.key);
        }

        public String getPassword() {
                return (String) get(JDBCDataStoreFactory.PASSWD.key);
        }

        public java.lang.Integer getPort() {
                java.lang.Integer port = (java.lang.Integer) get(JDBCDataStoreFactory.PORT.key);
                if (port == null)
                        return (java.lang.Integer) JDBCDataStoreFactory.PORT.sample;
                return port;
        }

        public String getSchema() {
                return (String) get(JDBCDataStoreFactory.SCHEMA.key);
        }

        public String getUsername() {
                return (String) get(JDBCDataStoreFactory.USER.key);
        }

        /**
         * @return <code>true</code>, if all parameters look OK, without actually
         *         opening any connection.
         */
        public boolean isWellDefined() {
                if (getDbType() == null)
                        return false;

                if (getHost() == null)
                        return false;

                if (getUsername() == null)
                        return false;

                if (getPassword() == null)
                        return false;

                if (getPort() == null)
                        return false;

                if (getSchema() == null)
                        return false;

                return true;
        }

        public void setCachedTypeNames(String[] cachedTypeNames) {
                this.cachedTypeNames = cachedTypeNames;
        }

        public void setDatabase(String db) {
                put(JDBCDataStoreFactory.DATABASE.key, db);
        }

        public void setDbType(DbType dbType) {
                put(PostgisNGDataStoreFactory.DBTYPE.key, dbType.toString());

                if (dbType == DbType.postgis) {
                        if (getPort() == null) {
                                // For a PostGIS DBMS automatically set the port to 5432
                                setPort(5432);
                        }
                        if (getUsername() == null) {
                                // For a PostGIS DBMS automatically set the user to postgres
                                setUsername("postgres");
                        }

                }

        }

        public void setExposePrimaryKey(Boolean exportPk) {
                put(JDBCDataStoreFactory.EXPOSE_PK.key, exportPk);
        }

        public void setHost(String host) {
                put(JDBCDataStoreFactory.HOST.key, host);
        }

        public void setPassword(String password) {
                put(JDBCDataStoreFactory.PASSWD.key, password);
        }

        public void setPort(java.lang.Integer port) {
                put(JDBCDataStoreFactory.PORT.key, port);
        }

        public void setSchema(String schema) {
                put(JDBCDataStoreFactory.SCHEMA.key, schema);
        }

        public void setUsername(String username) {
                put(JDBCDataStoreFactory.USER.key, username);
        }

        /**
         * @return transforms the settings to a String that can be stored in a
         *         .properties line. @see #parsePropertiesString
         */
        public String toPropertiesString() {

                StringBuffer serialized = new StringBuffer(100);

                serialized.append(getDbType().toString());
                serialized.append(DELIMITER);

                serialized.append(getTitle());
                serialized.append(DELIMITER);

                serialized.append(getHost());
                serialized.append(DELIMITER);

                serialized.append(getPort().toString());
                serialized.append(DELIMITER);

                serialized.append(getUsername());
                serialized.append(DELIMITER);

                serialized.append(getPassword());
                serialized.append(DELIMITER);

                serialized.append(getDatabase());
                serialized.append(DELIMITER);

                serialized.append(getExposePrimaryKey().toString());
                serialized.append(DELIMITER);

                serialized.append(getSchema().toString());
                // serialized.append(DELIMITER);

                return serialized.toString();
        }

        @Override
        public String toString() {

                StringBuffer s = new StringBuffer();

                if (getDbType() != null) {
                        s.append(getDbType().getProtocolString() + "://");
                }

                s.append(getHost());

                if (getPort() != null && getPort() != 5432) {
                        s.append(":" + getPort());
                }

                s.append("/" + getDatabase());

                return s.toString();
        }

        /**
         * returns a valid Connection to our postgresql Database. Name of database,
         * username and password must be provided.
         * 
         * @param database
         *            name of the database
         * @param username
         *            a valid username
         * @param password
         *            valid password
         * @return database connection
         * @throws SQLException
         * @throws ClassNotFoundException
         */
        public Connection getDatabaseConnection() {

                try {

                        if (dbc == null || dbc.isClosed()) {
                                dbc = createNewDatabaseConnection();
                        }
                        return dbc;
                } catch (Exception e) {
                        return null;
                }
        }

        private Connection createNewDatabaseConnection() throws SQLException {
                try {
                        Class.forName("org.postgresql.Driver");
                } catch (ClassNotFoundException e) {
                        throw new RuntimeException(e);
                }
                String url = "jdbc:postgresql://" + getHost()
                // + (":" + PropertyUtils.getDbPort())
                                + ("/" + getDatabase());

                String password = getPassword();
                String username = getUsername();

                // log.debug("DB URL: " + url + " u=" + username + " p="
                // + password);

                return DriverManager.getConnection(url, username, password);
        }

        public String[] getDescribedTablesWithGeometry() {

                if (cachedGeometryTableNames == null) {

                        Connection dc;
                        try {
                                dc = createNewDatabaseConnection();
                                try {

                                        cachedGeometryTableNames = PGUtil
                                                        .getColumnsDescribedInGeometryColumnsTable(dc
                                                                        .createStatement());

                                } catch (SQLException e) {
                                        log.error(e, e);
                                } finally {
                                        dc.close();
                                }
                        } catch (SQLException e1) {
                                log.error(e1, e1);
                                return new String[0];
                        }
                }
                return cachedGeometryTableNames;
        }

        @Override
        protected void finalize() throws Throwable {
                super.finalize();
                dispose();
        }

        public void dispose() {
                try {
                        if (dbc != null && !dbc.isClosed()) {
                                dbc.close();
                                dbc = null;
                        }
                } catch (SQLException e) {
                        log.error("Error while disposing the database connection to "
                                        + toString(), e);
                }
        }
}
1	package skrueger.geotools.io;
2
3	import java.awt.Component;
4	import java.net.MalformedURLException;
5	import java.sql.Connection;
6	import java.sql.DriverManager;
7	import java.sql.SQLException;
8	import java.util.HashMap;
9	import java.util.regex.Pattern;
10
11	import org.apache.commons.lang.ArrayUtils;
12	import org.apache.commons.lang.StringUtils;
13	import org.apache.log4j.Logger;
14	import org.geotools.data.postgis.PostgisNGDataStoreFactory;
15	import org.geotools.jdbc.JDBCDataStore;
16	import org.geotools.jdbc.JDBCDataStoreFactory;
17	import org.jfree.util.Log;
18
19	import schmitzm.swing.BooleanInputOption;
20	import schmitzm.swing.ManualInputOption;
21	import schmitzm.swing.ManualInputOption.Integer;
22	import schmitzm.swing.ManualInputOption.PasswordViewable;
23	import schmitzm.swing.ManualInputOption.Text;
24	import schmitzm.swing.MultipleOptionPane;
25	import schmitzm.swing.SelectionInputOption;
26	import schmitzm.swing.SelectionInputOption.Combo;
27	import skrueger.db.PGUtil;
28
29	/**
30	* This class describes all settings needed to connect to a WFS server. This
31	* class extends a {@link HashMap} and contains two groups of keys:<br/>
32	* The first group of keys, are all keys provided by Geotools to create a WFS
33	* datastore, like: {@link JDBCDataStore#SCHEMA} .<br/>
34	* The second group are additional keys defined in the enum
35	* {@link DbServerSettings.Key}.<br/>
36	* This class can serialize all important parameters needed to define the
37	* connection into a {@link String} with {@link #toPropertiesString()} and
38	* re-import the String with {@link #parsePropertiesString(String)}.
39	*/
40	public class DbServerSettings extends ServerSettings<Object, Object> {
41
42	Logger log = Logger.getLogger(DbServerSettings.class);
43
44	public enum DbType {
45	postgis("postgresql");
46
47	private final String protocolString;
48
49	DbType(String protocolString) {
50	this.protocolString = protocolString;
51	}
52
53	public String getProtocolString() {
54	return protocolString;
55	};
56	}
57
58	/**
59	* params.put(JDBCDataStoreFactory.DBTYPE.key, "postgis");
60	* params.put(JDBCDataStoreFactory.HOST.key, host); // the name or ip
61	* params.put(JDBCDataStoreFactory.PORT.key, port); // the port that
62	*
63	* params.put(JDBCDataStoreFactory.DATABASE.key, database); // the
64	*
65	* // name params.put(JDBCDataStoreFactory.USER.key, username); // the user
66	* to params.put(JDBCDataStoreFactory.PASSWD.key, password); // the
67	*
68	* params.put(JDBCDataStoreFactory.SCHEMA, schema);
69	*
70	* params.put(JDBCDataStoreFactory.EXPOSE_PK.key, true); *
71	*/
72
73	public enum Key {
74	}
75
76	private static Connection dbc;
77
78	/**
79	* Opens a GUI that asks the use define a DB connection.
80	*
81	* @param dbServer
82	* <code>null</code> to create a new instance, or an instance to
83	* edit.
84	* @return <code>null</code> if the user cancelled the creation of a new
85	* {@link DbServerSettings}, otherwise the edited instance.
86	*/
87	public static DbServerSettings createOrEdit(Component owner,
88	DbServerSettings dbServer) {
89	boolean newCreated = false;
90
91	if (dbServer == null) {
92	newCreated = true;
93	dbServer = new DbServerSettings(DbType.postgis);
94	}
95
96	Combo<DbType> dpTypeInput = new SelectionInputOption.Combo<DbType>(
97	"Database type", true, DbType.values(), ArrayUtils.indexOf(
98	DbType.values(), dbServer.getDbType()), DbType.values());
99
100	Text hostInput = new ManualInputOption.Text("Hostname", true,
101	dbServer.getHost());
102
103	Integer portInput = new ManualInputOption.Integer("Port", true,
104	dbServer.getPort());
105
106	Text databaseInput = new ManualInputOption.Text("Database", true,
107	dbServer.getDatabase());
108
109	Text schemaInput = new ManualInputOption.Text("Schema", true,
110	dbServer.getSchema());
111
112	Text userInput = new ManualInputOption.Text("Username", true,
113	dbServer.getUsername());
114
115	PasswordViewable passwdInput = new ManualInputOption.PasswordViewable(
116	"Password", true, dbServer.getPassword());
117
118	BooleanInputOption exposePkInput = new BooleanInputOption(
119	"Expose primary keys", dbServer.getExposePrimaryKey());
120
121	Object[] input = MultipleOptionPane.showMultipleInputDialog(owner,
122	"DB Connection paramters", dpTypeInput, hostInput, portInput,
123	databaseInput, schemaInput, userInput, passwdInput,
124	exposePkInput);
125
126	if (input == null) {
127	if (newCreated)
128	return null;
129	else
130	return dbServer;
131	} else {
132	dbServer.setDbType((DbType) input[0]);
133	dbServer.setHost((String) input[1]);
134	dbServer.setPort((java.lang.Integer) input[2]);
135	dbServer.setDatabase((String) input[3]);
136	dbServer.setSchema((String) input[4]);
137	dbServer.setUsername((String) input[5]);
138	dbServer.setPassword(String.valueOf((char[]) input[6]));
139	dbServer.setExposePrimaryKey((Boolean) input[7]);
140	}
141
142	return dbServer;
143
144	}
145
146	/**
147	* @return transforms the settings to a String that can be stored in a
148	* .properties line. @see #parsePropertiesString
149	* @throws MalformedURLException
150	*/
151	public static DbServerSettings parsePropertiesString(String propString)
152	throws MalformedURLException {
153
154	if (propString == null \|\| propString.isEmpty())
155	throw new IllegalArgumentException("parameter to parse was empty");
156	try {
157
158	String[] split = propString.split(Pattern.quote(DELIMITER));
159
160	int i = 0;
161	DbServerSettings dbServer = new DbServerSettings(
162	DbType.valueOf(split[i++]));
163
164	dbServer.setTitle(split[i++]);
165	dbServer.setHost(split[i++]);
166	dbServer.setPort(java.lang.Integer.valueOf(split[i++]));
167	dbServer.setUsername(StringUtils.stripToNull(split[i++]));
168	dbServer.setPassword(split[i++]);
169	dbServer.setDatabase(split[i++]);
170	dbServer.setExposePrimaryKey(Boolean.valueOf(split[i++]));
171	dbServer.setSchema(stringOrNull(split[i++]));
172
173	return dbServer;
174	} catch (Exception e) {
175	Log.warn("couldn't parse " + propString, e);
176	return null;
177	}
178	}
179
180	private String[] cachedTypeNames = null;
181	private String[] cachedGeometryTableNames;
182
183	public DbServerSettings() {
184	this(DbType.postgis);
185	}
186
187	public DbServerSettings(DbType dbType) {
188	setDbType(dbType);
189	setHost("localhost");
190	setSchema("public");
191	put(JDBCDataStoreFactory.PK_METADATA_TABLE.key, null);
192	}
193
194	public String[] getCachedTypeNames() {
195	return cachedTypeNames;
196	}
197
198	public String getDatabase() {
199	return (String) get(JDBCDataStoreFactory.DATABASE.key);
200	}
201
202	public DbType getDbType() {
203	String dbt = (String) get(PostgisNGDataStoreFactory.DBTYPE.key);
204	if (dbt != null)
205	return DbType.valueOf(dbt);
206	return null;
207	}
208
209	public Boolean getExposePrimaryKey() {
210	Boolean expk = (Boolean) get(JDBCDataStoreFactory.EXPOSE_PK.key);
211	if (expk == null)
212	return (Boolean) JDBCDataStoreFactory.EXPOSE_PK.sample;
213	return expk;
214	}
215
216	public String getHost() {
217	return (String) get(JDBCDataStoreFactory.HOST.key);
218	}
219
220	public String getPassword() {
221	return (String) get(JDBCDataStoreFactory.PASSWD.key);
222	}
223
224	public java.lang.Integer getPort() {
225	java.lang.Integer port = (java.lang.Integer) get(JDBCDataStoreFactory.PORT.key);
226	if (port == null)
227	return (java.lang.Integer) JDBCDataStoreFactory.PORT.sample;
228	return port;
229	}
230
231	public String getSchema() {
232	return (String) get(JDBCDataStoreFactory.SCHEMA.key);
233	}
234
235	public String getUsername() {
236	return (String) get(JDBCDataStoreFactory.USER.key);
237	}
238
239	/**
240	* @return <code>true</code>, if all parameters look OK, without actually
241	* opening any connection.
242	*/
243	public boolean isWellDefined() {
244	if (getDbType() == null)
245	return false;
246
247	if (getHost() == null)
248	return false;
249
250	if (getUsername() == null)
251	return false;
252
253	if (getPassword() == null)
254	return false;
255
256	if (getPort() == null)
257	return false;
258
259	if (getSchema() == null)
260	return false;
261
262	return true;
263	}
264
265	public void setCachedTypeNames(String[] cachedTypeNames) {
266	this.cachedTypeNames = cachedTypeNames;
267	}
268
269	public void setDatabase(String db) {
270	put(JDBCDataStoreFactory.DATABASE.key, db);
271	}
272
273	public void setDbType(DbType dbType) {
274	put(PostgisNGDataStoreFactory.DBTYPE.key, dbType.toString());
275
276	if (dbType == DbType.postgis) {
277	if (getPort() == null) {
278	// For a PostGIS DBMS automatically set the port to 5432
279	setPort(5432);
280	}
281	if (getUsername() == null) {
282	// For a PostGIS DBMS automatically set the user to postgres
283	setUsername("postgres");
284	}
285
286	}
287
288	}
289
290	public void setExposePrimaryKey(Boolean exportPk) {
291	put(JDBCDataStoreFactory.EXPOSE_PK.key, exportPk);
292	}
293
294	public void setHost(String host) {
295	put(JDBCDataStoreFactory.HOST.key, host);
296	}
297
298	public void setPassword(String password) {
299	put(JDBCDataStoreFactory.PASSWD.key, password);
300	}
301
302	public void setPort(java.lang.Integer port) {
303	put(JDBCDataStoreFactory.PORT.key, port);
304	}
305
306	public void setSchema(String schema) {
307	put(JDBCDataStoreFactory.SCHEMA.key, schema);
308	}
309
310	public void setUsername(String username) {
311	put(JDBCDataStoreFactory.USER.key, username);
312	}
313
314	/**
315	* @return transforms the settings to a String that can be stored in a
316	* .properties line. @see #parsePropertiesString
317	*/
318	public String toPropertiesString() {
319
320	StringBuffer serialized = new StringBuffer(100);
321
322	serialized.append(getDbType().toString());
323	serialized.append(DELIMITER);
324
325	serialized.append(getTitle());
326	serialized.append(DELIMITER);
327
328	serialized.append(getHost());
329	serialized.append(DELIMITER);
330
331	serialized.append(getPort().toString());
332	serialized.append(DELIMITER);
333
334	serialized.append(getUsername());
335	serialized.append(DELIMITER);
336
337	serialized.append(getPassword());
338	serialized.append(DELIMITER);
339
340	serialized.append(getDatabase());
341	serialized.append(DELIMITER);
342
343	serialized.append(getExposePrimaryKey().toString());
344	serialized.append(DELIMITER);
345
346	serialized.append(getSchema().toString());
347	// serialized.append(DELIMITER);
348
349	return serialized.toString();
350	}
351
352	@Override
353	public String toString() {
354
355	StringBuffer s = new StringBuffer();
356
357	if (getDbType() != null) {
358	s.append(getDbType().getProtocolString() + "://");
359	}
360
361	s.append(getHost());
362
363	if (getPort() != null && getPort() != 5432) {
364	s.append(":" + getPort());
365	}
366
367	s.append("/" + getDatabase());
368
369	return s.toString();
370	}
371
372	/**
373	* returns a valid Connection to our postgresql Database. Name of database,
374	* username and password must be provided.
375	*
376	* @param database
377	* name of the database
378	* @param username
379	* a valid username
380	* @param password
381	* valid password
382	* @return database connection
383	* @throws SQLException
384	* @throws ClassNotFoundException
385	*/
386	public Connection getDatabaseConnection() {
387
388	try {
389
390	if (dbc == null \|\| dbc.isClosed()) {
391	dbc = createNewDatabaseConnection();
392	}
393	return dbc;
394	} catch (Exception e) {
395	return null;
396	}
397	}
398
399	private Connection createNewDatabaseConnection() throws SQLException {
400	try {
401	Class.forName("org.postgresql.Driver");
402	} catch (ClassNotFoundException e) {
403	throw new RuntimeException(e);
404	}
405	String url = "jdbc:postgresql://" + getHost()
406	// + (":" + PropertyUtils.getDbPort())
407	+ ("/" + getDatabase());
408
409	String password = getPassword();
410	String username = getUsername();
411
412	// log.debug("DB URL: " + url + " u=" + username + " p="
413	// + password);
414
415	return DriverManager.getConnection(url, username, password);
416	}
417
418	public String[] getDescribedTablesWithGeometry() {
419
420	if (cachedGeometryTableNames == null) {
421
422	Connection dc;
423	try {
424	dc = createNewDatabaseConnection();
425	try {
426
427	cachedGeometryTableNames = PGUtil
428	.getColumnsDescribedInGeometryColumnsTable(dc
429	.createStatement());
430
431	} catch (SQLException e) {
432	log.error(e, e);
433	} finally {
434	dc.close();
435	}
436	} catch (SQLException e1) {
437	log.error(e1, e1);
438	return new String[0];
439	}
440	}
441	return cachedGeometryTableNames;
442	}
443
444	@Override
445	protected void finalize() throws Throwable {
446	super.finalize();
447	dispose();
448	}
449
450	public void dispose() {
451	try {
452	if (dbc != null && !dbc.isClosed()) {
453	dbc.close();
454	dbc = null;
455	}
456	} catch (SQLException e) {
457	log.error("Error while disposing the database connection to "
458	+ toString(), e);
459	}
460	}
461	}
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