gitorious.org Git - online-glom:gwt-glom.git/blob - src/main/java/org/glom/web/server/OnlineGlomServiceImpl.java

1 /*

3 *

4 * This file is part of GWT-Glom.

5 *

6 * GWT-Glom is free software: you can redistribute it and/or modify it

7 * under the terms of the GNU Lesser General Public License as published by the

8 * Free Software Foundation, either version 3 of the License, or (at your

9 * option) any later version.

10 *

11 * GWT-Glom is distributed in the hope that it will be useful, but WITHOUT

12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License

14 * for more details.

15 *

16 * You should have received a copy of the GNU Lesser General Public License

17 * along with GWT-Glom. If not, see <http://www.gnu.org/licenses/>.

18 */

19

20 package org.glom.web.server;

21

22 import java.beans.PropertyVetoException;

23 import java.sql.Connection;

24 import java.sql.Date;

25 import java.sql.ResultSet;

26 import java.sql.SQLException;

27 import java.sql.Statement;

28 import java.sql.Time;

29 import java.text.DateFormat;

30 import java.text.DecimalFormat;

31 import java.text.NumberFormat;

32 import java.util.ArrayList;

33 import java.util.Currency;

34 import java.util.Locale;

35

36 import org.glom.libglom.Document;

37 import org.glom.libglom.Field;

38 import org.glom.libglom.FieldFormatting;

39 import org.glom.libglom.Glom;

40 import org.glom.libglom.LayoutFieldVector;

41 import org.glom.libglom.LayoutGroupVector;

42 import org.glom.libglom.LayoutItem;

43 import org.glom.libglom.LayoutItemVector;

44 import org.glom.libglom.LayoutItem_Field;

45 import org.glom.libglom.NumericFormat;

46 import org.glom.libglom.SortClause;

47 import org.glom.libglom.SortFieldPair;

48 import org.glom.libglom.StringVector;

49 import org.glom.web.client.OnlineGlomService;

50 import org.glom.web.shared.GlomDocument;

51 import org.glom.web.shared.LayoutListTable;

52

53 import com.google.gwt.user.server.rpc.RemoteServiceServlet;

54 import com.mchange.v2.c3p0.ComboPooledDataSource;

55 import com.mchange.v2.c3p0.DataSources;

56

57 @SuppressWarnings("serial")

58 public class OnlineGlomServiceImpl extends RemoteServiceServlet implements OnlineGlomService {

59 private Document document;

60 private ComboPooledDataSource cpds;

61 // TODO implement locale

62 private Locale locale = Locale.ENGLISH;

63

64 // Called only when the servlet is stopped (the servlet container is stopped or restarted)

65 public OnlineGlomServiceImpl() {

66 Glom.libglom_init();

67 document = new Document();

68 // TODO hardcoded for now, need to figure out something for this

69 document.set_file_uri("file:///home/ben/small-business-example.glom");

70 int error = 0;

71 @SuppressWarnings("unused")

72 boolean retval = document.load(error);

73 // TODO handle error condition (also below)

74

75 cpds = new ComboPooledDataSource();

76 // load the jdbc driver

77 try {

78 cpds.setDriverClass("org.postgresql.Driver");

79 } catch (PropertyVetoException e) {

80 // TODO log error, fatal error can't continue, user can be nofified when db access doesn't work

81 e.printStackTrace();

82 }

83

84 cpds.setJdbcUrl("jdbc:postgresql://" + document.get_connection_server() + "/"

85 + document.get_connection_database());

86 // TODO figure out something for db user name and password

87 cpds.setUser("ben");

88 cpds.setPassword("ChangeMe"); // of course it's not the password I'm using on my server

89 }

90

91 /*

92 * FIXME I think Swig is generating long on 64-bit machines and int on 32-bit machines - need to keep this constant

93 * http://stackoverflow.com/questions/1590831/safely-casting-long-to-int-in-java

94 */

95 public static int safeLongToInt(long l) {

96 if (l < Integer.MIN_VALUE || l > Integer.MAX_VALUE) {

97 throw new IllegalArgumentException(l + " cannot be cast to int without changing its value.");

98 }

99 return (int) l;

100 }

101

102 public GlomDocument getGlomDocument() {

103 GlomDocument glomDocument = new GlomDocument();

104

105 // get arrays of table names and titles, and find the default table index

106 StringVector tablesVec = document.get_table_names();

107 int numTables = safeLongToInt(tablesVec.size());

108 String[] tableNames = new String[numTables];

109 String[] tableTitles = new String[numTables];

110 boolean foundDefaultTable = false;

111 for (int i = 0; i < numTables; i++) {

112 String tableName = tablesVec.get(i);

113 tableNames[i] = tableName;

114 // JNI is "expensive", the comparison will only be called if we haven't already found the default table

115 if (!foundDefaultTable && tableName.equals(document.get_default_table())) {

116 glomDocument.setDefaultTableIndex(i);

117 foundDefaultTable = true;

118 }

119 tableTitles[i] = document.get_table_title(tableName);

120 }

121

122 // set everything we need

123 glomDocument.setTableNames(tableNames);

124 glomDocument.setTableTitles(tableTitles);

125 glomDocument.setTitle(document.get_database_title());

126

127 return glomDocument;

128 }

129

130 public LayoutListTable getLayoutListTable(String tableName) {

131 LayoutListTable tableInfo = new LayoutListTable();

132

133 LayoutGroupVector layoutListVec = document.get_data_layout_groups("list", tableName);

134 LayoutItemVector layoutItemsVec = layoutListVec.get(0).get_items();

135 int numItems = safeLongToInt(layoutItemsVec.size());

136 String[] columnTitles = new String[numItems];

137 LayoutFieldVector layoutFields = new LayoutFieldVector();

138 for (int i = 0; i < numItems; i++) {

139 LayoutItem item = layoutItemsVec.get(i);

140 columnTitles[i] = item.get_title_or_name();

141 LayoutItem_Field field = LayoutItem_Field.cast_dynamic(item);

142 if (field != null) {

143 layoutFields.add(field);

144 }

145 }

146

147 tableInfo.setColumnTitles(columnTitles);

148

149 // get the size of the returned query for the pager

150 // TODO since we're executing a query anyway, maybe we should return the rows that will be displayed on the

151 // first page

152 // TODO this code is really similar to code in getTableData, find a way to not duplicate the code

153 Connection conn = null;

154 Statement st = null;

155 ResultSet rs = null;

156 try {

157 // setup and execute the query

158 conn = cpds.getConnection();

159 st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);

160 String query = Glom.build_sql_select_simple(tableName, layoutFields);

161 rs = st.executeQuery(query);

162

163 // get the number of rows in the query

164 rs.setFetchDirection(ResultSet.FETCH_FORWARD);

165 rs.last();

166 tableInfo.setNumRows(rs.getRow());

167

168 } catch (SQLException e) {

169 // TODO log error

170 // we don't know how many rows are in the query

171 e.printStackTrace();

172 tableInfo.setNumRows(0);

173 } finally {

174 // this is a little awkward but we want to ensure that we're cleaning everything up that has been used

175 try {

176 rs.close();

177 st.close();

178 conn.close();

179 } catch (Exception e) {

180 // TODO log error

181 e.printStackTrace();

182 }

183 }

184

185 return tableInfo;

186 }

187

188 public ArrayList<String[]> getTableData(int start, int length, String table) {

189 LayoutGroupVector layoutList = document.get_data_layout_groups("list", table);

190 LayoutItemVector layoutItems = layoutList.get(0).get_items();

191

192 LayoutFieldVector layoutFields = new LayoutFieldVector();

193 SortClause sortClause = new SortClause();

194 int numItems = safeLongToInt(layoutItems.size());

195 for (int i = 0; i < numItems; i++) {

196 LayoutItem item = layoutItems.get(i);

197 LayoutItem_Field field = LayoutItem_Field.cast_dynamic(item);

198 if (field != null) {

199 layoutFields.add(field);

200 Field details = field.get_full_field_details();

201 if (details != null && details.get_primary_key()) {

202 sortClause.addLast(new SortFieldPair(field, true)); // ascending

203 }

204 }

205 }

206

207 ArrayList<String[]> rowsList = new ArrayList<String[]>();

208 Connection conn = null;

209 Statement st = null;

210 ResultSet rs = null;

211 try {

212 // setup and execute the query

213 conn = cpds.getConnection();

214 st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);

215 String query = Glom.build_sql_select_simple(table, layoutFields, sortClause);

216 rs = st.executeQuery(query);

217

218 // get data we're asked for

219 // TODO need to setup the result set in cursor mode so that not all of the results are pulled into memory

220 rs.setFetchDirection(ResultSet.FETCH_FORWARD);

221 rs.absolute(start);

222 int rowCount = 0;

223 while (rs.next() && rowCount <= length) {

224 int layoutItemsSize = safeLongToInt(layoutItems.size());

225 String[] rowArray = new String[layoutItemsSize];

226 for (int i = 0; i < layoutItemsSize; i++) {

227 LayoutItem_Field field = layoutFields.get(i);

228 FieldFormatting formatting = field.get_formatting_used();

229

230 // field values are converted to strings differently for every glom type

231 Field.glom_field_type fieldType = field.get_glom_type();

232 switch (fieldType) {

233 case TYPE_TEXT:

234 rowArray[i] = rs.getString(i + 1);

235 break;

236 case TYPE_BOOLEAN:

237 rowArray[i] = rs.getBoolean(i + 1) ? "TRUE" : "FALSE";

238 break;

239 case TYPE_NUMERIC:

240 NumericFormat numFormatGlom = formatting.getM_numeric_format();

241 // there's no isCurrency() method in the glom NumericFormat class so we're assuming that the

242 // number should be formatted as a currency if the currency symbol is set

243 String currencySymbol = numFormatGlom.getM_currency_symbol();

244 NumberFormat numFormatJava;

245 if (currencySymbol.length() == 3) {

246 Currency currency = Currency.getInstance(currencySymbol);

247 // we're not using the glom value for digits or grouping when it's a currency

248 int digits = currency.getDefaultFractionDigits();

249 numFormatJava = (DecimalFormat) NumberFormat.getCurrencyInstance(locale);

250 numFormatJava.setCurrency(currency);

251 numFormatJava.setMinimumFractionDigits(digits);

252 numFormatJava.setMaximumFractionDigits(digits);

253 } else {

254 numFormatJava = NumberFormat.getInstance(locale);

255 if (numFormatGlom.getM_decimal_places_restricted()) {

256 int digits = safeLongToInt(numFormatGlom.getM_decimal_places());

257 numFormatJava.setMinimumFractionDigits(digits);

258 numFormatJava.setMaximumFractionDigits(digits);

259 }

260 numFormatJava.setGroupingUsed(numFormatGlom.getM_use_thousands_separator());

261 }

262

263 // TODO: Do I need to do something with this from libglom?

264 // NumericFormat.get_default_precision();

265

266 rowArray[i] = numFormatJava.format(rs.getDouble(i + 1));

267 break;

268 case TYPE_DATE:

269 Date date = rs.getDate(i + 1);

270 if (date != null) {

271 DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.MEDIUM, locale);

272 rowArray[i] = dateFormat.format(rs.getDate(i + 1));

273 } else {

274 rowArray[i] = "";

275 }

276 break;

277 case TYPE_TIME:

278 Time time = rs.getTime(i + 1);

279 if (time != null) {

280 DateFormat timeFormat = DateFormat.getTimeInstance(DateFormat.MEDIUM, locale);

281 rowArray[i] = timeFormat.format(time);

282 } else {

283 rowArray[i] = "";

284 }

285 break;

286 case TYPE_IMAGE:

287 // TODO log warning message

288 break;

289 case TYPE_INVALID:

290 default:

291 // TODO log warning message

292 break;

293 }

294 }

295 rowsList.add(rowArray);

296 rowCount++;

297 }

298 } catch (SQLException e) {

299 // TODO: log error, notify user of problem

300 e.printStackTrace();

301 } finally {

302 // this is a little awkward but we want to ensure that we're cleaning everything up that has been used

303 try {

304 rs.close();

305 st.close();

306 conn.close();

307 } catch (Exception e) {

308 // TODO log error

309 e.printStackTrace();

310 }

311 }

312 return rowsList;

313 }

314

315 // Called only when the servlet is stopped (the servlet container is stopped or restarted)

316 public void destroy() {

317 Glom.libglom_deinit();

318 try {

319 DataSources.destroy(cpds);

320 } catch (SQLException e) {

321 // TODO log error, don't need to notify user because this is a clean up method

322 e.printStackTrace();

323 }

324 }

325

326 }