1 |
package dk.thoerup.traininfoservice.db; |
2 |
|
3 |
import java.sql.Array; |
4 |
import java.sql.Connection; |
5 |
import java.sql.PreparedStatement; |
6 |
import java.sql.ResultSet; |
7 |
import java.sql.SQLException; |
8 |
import java.sql.Statement; |
9 |
import java.util.Collections; |
10 |
import java.util.Comparator; |
11 |
import java.util.logging.Logger; |
12 |
|
13 |
import dk.thoerup.android.traininfo.common.StationBean; |
14 |
import dk.thoerup.android.traininfo.common.StationEntry; |
15 |
|
16 |
public class StationDAO { |
17 |
|
18 |
private interface StatementParamSetter { |
19 |
public void setParams(PreparedStatement stmt) throws SQLException ; |
20 |
} |
21 |
private class NullSetter implements StatementParamSetter { |
22 |
@Override |
23 |
public void setParams(PreparedStatement stmt) throws SQLException {} |
24 |
} |
25 |
|
26 |
public static class NostationException extends Exception { |
27 |
private static final long serialVersionUID = 1L; |
28 |
} |
29 |
|
30 |
final static int LOCATION_LIMIT = 8; |
31 |
static final Logger logger = Logger.getLogger(StationDAO.class.getName()); |
32 |
|
33 |
|
34 |
private StationEntry convertSingleRow(ResultSet res) throws SQLException { |
35 |
StationEntry station = new StationEntry(); |
36 |
|
37 |
station.setId( res.getInt(1) ); |
38 |
station.setName( res.getString(2) ); |
39 |
station.setLatitude( res.getDouble(3) ); |
40 |
station.setLongitude( res.getDouble(4) ); |
41 |
station.setRegional( res.getString(5) ); |
42 |
station.setStrain( res.getString(6) ); |
43 |
station.setMetro( res.getString(7) ); |
44 |
station.setAddress( res.getString(8) ); |
45 |
station.setCalcdist( (int)res.getDouble(9) ); |
46 |
|
47 |
station.setIsRegional( station.getRegional() != null ); |
48 |
station.setIsStrain( station.getStrain() != null ); |
49 |
station.setIsMetro( station.getMetro() != null ); |
50 |
|
51 |
Array aliases = res.getArray( 10); |
52 |
if (aliases != null) { |
53 |
station.setAliases( (String[]) aliases.getArray() ); |
54 |
} else { |
55 |
String[] emptyArray = {}; |
56 |
station.setAliases( emptyArray ); |
57 |
} |
58 |
|
59 |
station.setTritStation( res.getInt(11) ); |
60 |
if (res.wasNull()) |
61 |
station.setTritStation( -1 ); |
62 |
|
63 |
return station; |
64 |
} |
65 |
|
66 |
private StationBean convertResultset(ResultSet res) throws SQLException { |
67 |
StationBean stations = new StationBean(); |
68 |
while (res.next()) { |
69 |
stations.entries.add( convertSingleRow(res) ); |
70 |
} |
71 |
return stations; |
72 |
|
73 |
} |
74 |
|
75 |
private StationBean fetchStations(String SQL, StatementParamSetter setter) throws SQLException { |
76 |
StationBean stations; |
77 |
Connection conn = null; |
78 |
PreparedStatement stmt = null; |
79 |
ResultSet res = null; |
80 |
try { |
81 |
conn = DBConnection.getConnection(); |
82 |
stmt = conn.prepareStatement(SQL); |
83 |
|
84 |
setter.setParams(stmt); |
85 |
|
86 |
res = stmt.executeQuery(); |
87 |
stations = convertResultset(res); |
88 |
|
89 |
} finally { |
90 |
if (res != null) |
91 |
res.close(); |
92 |
if (stmt != null) |
93 |
stmt.close(); |
94 |
if (conn!= null) |
95 |
conn.close(); |
96 |
} |
97 |
return stations; |
98 |
|
99 |
} |
100 |
|
101 |
public StationEntry getById(int id) throws SQLException,NostationException { |
102 |
String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0,aliases,tritstation " + |
103 |
"FROM trainstations WHERE id=" + id + " AND enabled=true"; |
104 |
|
105 |
StationBean stations = fetchStations(SQL, new NullSetter() ); |
106 |
|
107 |
if (stations.entries.size() > 0 ) { |
108 |
return stations.entries.get(0); |
109 |
} else { |
110 |
throw new NostationException(); |
111 |
} |
112 |
} |
113 |
|
114 |
|
115 |
|
116 |
/* |
117 |
* this code requires theses statements are run on database in order to do ILIKE searches against aliases (which is defines as array of varchar(64) ) |
118 |
* create function rlike(text,text) returns bool as |
119 |
* 'select $2 ilike $1' language sql strict immutable; |
120 |
* create operator ~~~ (procedure = rlike, leftarg = text, rightarg = text, commutator = ~~); |
121 |
*/ |
122 |
public StationBean getByNameNormal(final String name) throws SQLException { |
123 |
String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0,aliases,tritstation " + |
124 |
"FROM trainstations " + |
125 |
"WHERE (name ILIKE ? OR ? ~~~ ANY(aliases)) AND enabled = true " + |
126 |
"ORDER BY name "; |
127 |
|
128 |
class NameSetter implements StatementParamSetter { |
129 |
@Override |
130 |
public void setParams(PreparedStatement stmt) throws SQLException { |
131 |
stmt.setString(1, name + "%"); |
132 |
stmt.setString(2, name + "%"); |
133 |
} |
134 |
} |
135 |
|
136 |
return fetchStations(SQL, new NameSetter() ); |
137 |
} |
138 |
|
139 |
|
140 |
public StationBean getByNameFuzzy(final String name) throws SQLException { |
141 |
String SQL = "SELECT * FROM (" + |
142 |
" SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0, aliases, tritstation, " + |
143 |
" levenshtein(lower(name),lower(?) ) as leven " + |
144 |
" FROM trainstations " + |
145 |
" WHERE enabled = true ) as lev2 " + |
146 |
"WHERE (leven <= 3) " + |
147 |
"ORDER BY leven " + |
148 |
"LIMIT 1"; |
149 |
|
150 |
class NameSetter implements StatementParamSetter { |
151 |
@Override |
152 |
public void setParams(PreparedStatement stmt) throws SQLException { |
153 |
stmt.setString(1, name ); |
154 |
} |
155 |
} |
156 |
|
157 |
StationBean stations = fetchStations(SQL, new NameSetter() ); |
158 |
stations.fuzzystrmatch = true; |
159 |
return stations; |
160 |
} |
161 |
|
162 |
private String removeSuffix(String str, String suffix) { |
163 |
if (str.endsWith(suffix)) { |
164 |
return str.substring(0, str.length() - suffix.length() ); |
165 |
} else { |
166 |
return str; |
167 |
} |
168 |
} |
169 |
|
170 |
public StationBean getByName(String name) throws SQLException { |
171 |
name = removeSuffix(name, " st."); |
172 |
name = removeSuffix(name, " st"); |
173 |
name = removeSuffix(name, " station"); |
174 |
|
175 |
StationBean stations = getByNameNormal(name); |
176 |
|
177 |
if (stations.entries.size() == 0) { |
178 |
stations = getByNameFuzzy(name); |
179 |
|
180 |
logger.info("getByName failover: " + name + "(" + (stations.entries.size() >0) + ")" ); |
181 |
} |
182 |
return stations; |
183 |
} |
184 |
|
185 |
|
186 |
|
187 |
//Latitude (horizonal), longitude(vertical) so |
188 |
// 1 degree latitude is ~ 111320 meters, since the distance between the horizonal lines is always the same |
189 |
// 1 degree longitude is ~111320 meters at equator but gets shorter as we get closer to the poles. |
190 |
// so 1 degree longitude is 64.5 km at denmarks southern point (gedser=54.55,11.95) |
191 |
// and is 59.4km at northern point (skagen = 57.75,10.65) |
192 |
// The "hack" with max 0.4 degrees latitude and 0.75 degrees longitude is only valid since we only service danish trains, |
193 |
// in denmark 0.4dg latitude ~ 44km, 0.75dg longitude ~ 47km |
194 |
|
195 |
// the ultra fast method (and only slightly inaccurate as long as we only cover a limited geographically area) |
196 |
// is using an aproximation of the length of 1 latitude degree and 1 longitude degree and just use pythagoras to |
197 |
// calculate the distance: |
198 |
// sqrt( power(abs(latitude-?)*111320, 2) + power(abs(longitude-?)*63000,2) )::int as calcdist |
199 |
|
200 |
public StationBean getByLocationWorker(final double latitude, final double longitude, final boolean geolimit) throws SQLException { |
201 |
|
202 |
String limitExpression = (geolimit == true) ? "AND abs(latitude-?)<0.4 AND abs(longitude-?)<0.75 " : ""; |
203 |
|
204 |
String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, " + |
205 |
"earth_distance( earth_coord, ll_to_earth(?,?))::int AS calcdist,aliases,tritstation " + |
206 |
"FROM trainstations " + |
207 |
"WHERE enabled = true " + limitExpression + |
208 |
"ORDER BY calcdist ASC " + |
209 |
"LIMIT " + LOCATION_LIMIT; |
210 |
|
211 |
|
212 |
class LatlongSetter implements StatementParamSetter { |
213 |
@Override |
214 |
public void setParams(PreparedStatement stmt) throws SQLException { |
215 |
stmt.setDouble(1, latitude); |
216 |
stmt.setDouble(2, longitude); |
217 |
if (geolimit == true) { |
218 |
stmt.setDouble(3, latitude); |
219 |
stmt.setDouble(4, longitude); |
220 |
} |
221 |
} |
222 |
} |
223 |
|
224 |
return fetchStations(SQL, new LatlongSetter() ); |
225 |
} |
226 |
|
227 |
public StationBean getByLocation(double latitude, double longitude) throws SQLException { |
228 |
StationBean result = getByLocationWorker(latitude, longitude, true); |
229 |
|
230 |
if (result.entries.size() < LOCATION_LIMIT) { //failover |
231 |
logger.info("getByLocation failover: " +latitude + "," + longitude); |
232 |
|
233 |
result = getByLocationWorker(latitude, longitude, false); |
234 |
} |
235 |
|
236 |
return result; |
237 |
} |
238 |
|
239 |
|
240 |
|
241 |
public StationBean getByList(String list) throws SQLException { |
242 |
String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro, address,0.0,aliases,tritstation " + |
243 |
"FROM trainstations " + |
244 |
"WHERE id IN " + list + " AND enabled = true " + |
245 |
"ORDER BY name "; |
246 |
|
247 |
return fetchStations(SQL, new NullSetter() ); |
248 |
} |
249 |
|
250 |
|
251 |
|
252 |
public StationEntry getSimpleByName(final String name) throws SQLException { |
253 |
String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0,aliases,tritstation " + |
254 |
"FROM trainstations " + |
255 |
"WHERE name = ? AND enabled = true " + |
256 |
"LIMIT 1 "; |
257 |
|
258 |
class NameSetter implements StatementParamSetter { |
259 |
@Override |
260 |
public void setParams(PreparedStatement stmt) throws SQLException { |
261 |
stmt.setString(1, name ); |
262 |
} |
263 |
} |
264 |
|
265 |
StationBean stations = fetchStations(SQL, new NameSetter() ); |
266 |
|
267 |
if (stations.entries.size() == 1) { |
268 |
return stations.entries.get(0); |
269 |
} else { |
270 |
return null; |
271 |
} |
272 |
} |
273 |
|
274 |
Comparator<StationEntry> nameComparator = new Comparator<StationEntry>() { |
275 |
@Override |
276 |
public int compare(StationEntry arg0, StationEntry arg1) { |
277 |
return arg0.getName().compareTo( arg1.getName() ); |
278 |
} |
279 |
}; |
280 |
|
281 |
//used to create full dump in order to populate Google Appengine DB |
282 |
//after 1.1.0 also used to populate client-side station list |
283 |
public StationBean dumpAll() throws SQLException { |
284 |
|
285 |
String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog,stationcode_metro,address,0.0,aliases,tritstation " + |
286 |
"FROM trainstations WHERE enabled = true"; |
287 |
|
288 |
|
289 |
StationBean stations = fetchStations(SQL, new NullSetter() ); |
290 |
Collections.sort( stations.entries,nameComparator ); |
291 |
|
292 |
return stations; |
293 |
|
294 |
/* |
295 |
Connection conn = null; |
296 |
Statement stmt = null; |
297 |
ResultSet res = null; |
298 |
|
299 |
|
300 |
try { |
301 |
conn = DBConnection.getConnection(); |
302 |
|
303 |
stmt = conn.createStatement(); |
304 |
res = stmt.executeQuery(SQL); |
305 |
|
306 |
// Does mostly the same as convertResultset() |
307 |
StationBean stations = new StationBean(); |
308 |
while (res.next()) { |
309 |
StationEntry entry = convertSingleRow(res); |
310 |
|
311 |
Array arr = res.getArray(10); |
312 |
if (arr != null) { |
313 |
String[] aliases = (String[]) arr.getArray(); |
314 |
entry.setAliases(aliases); |
315 |
} |
316 |
|
317 |
stations.entries.add( entry ); |
318 |
|
319 |
} |
320 |
Collections.sort( stations.entries,nameComparator ); |
321 |
return stations; |
322 |
|
323 |
|
324 |
} finally { |
325 |
if (res != null) |
326 |
res.close(); |
327 |
if (stmt != null) |
328 |
stmt.close(); |
329 |
if (conn != null) |
330 |
conn.close(); |
331 |
}*/ |
332 |
|
333 |
} |
334 |
|
335 |
/* |
336 |
@Deprecated |
337 |
public static String getStationName(int stationID) { |
338 |
String station = ""; |
339 |
|
340 |
Connection conn = null; |
341 |
try { |
342 |
conn = DBConnection.getConnection(); |
343 |
Statement stmt = conn.createStatement(); |
344 |
ResultSet rs = stmt.executeQuery("SELECT name FROM trainstations WHERE id=" + stationID); |
345 |
if (rs.next()) { |
346 |
station = rs.getString(1); |
347 |
} |
348 |
|
349 |
} catch (Exception e) { |
350 |
} finally { |
351 |
try { |
352 |
if (conn != null && !conn.isClosed()) |
353 |
conn.close(); |
354 |
} catch (Exception e) {} |
355 |
} |
356 |
|
357 |
return station; |
358 |
}*/ |
359 |
|
360 |
public boolean hasDisabledStation(final String name) throws SQLException { |
361 |
String SQL = "Select count(*) as antal from trainstations where name = '" + name + "' and enabled=false " ; |
362 |
|
363 |
Connection conn = DBConnection.getConnection(); |
364 |
Statement stmt = conn.createStatement(); |
365 |
ResultSet rs = stmt.executeQuery( SQL ); |
366 |
|
367 |
rs.next(); |
368 |
|
369 |
int antal = rs.getInt(1); |
370 |
|
371 |
rs.close(); |
372 |
stmt.close(); |
373 |
conn.close(); |
374 |
|
375 |
return (antal > 0); |
376 |
} |
377 |
|
378 |
/* |
379 |
@Deprecated |
380 |
public int getIdByName(final String name) throws SQLException { |
381 |
String SQL = "SELECT id,name,latitude,longitude,stationcode_fjrn,stationcode_stog, stationcode_metro, address, 0.0 " + |
382 |
"FROM trainstations " + |
383 |
"WHERE name = ? AND enabled = true " + |
384 |
"LIMIT 1 "; |
385 |
|
386 |
class NameSetter implements StatementParamSetter { |
387 |
@Override |
388 |
public void setParams(PreparedStatement stmt) throws SQLException { |
389 |
stmt.setString(1, name ); |
390 |
} |
391 |
} |
392 |
|
393 |
StationBean stations = fetchStations(SQL, new NameSetter() ); |
394 |
|
395 |
if (stations.entries.size() == 1) { |
396 |
return stations.entries.get(0).getId(); |
397 |
} else { |
398 |
return -1; |
399 |
} |
400 |
}*/ |
401 |
} |