Java tutorial
/******************************************************************************* * HELIUM V, Open Source ERP software for sustained success * at small and medium-sized enterprises. * Copyright (C) 2004 - 2014 HELIUM V IT-Solutions GmbH * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published * by the Free Software Foundation, either version 3 of theLicense, or * (at your option) any later version. * * According to sec. 7 of the GNU Affero General Public License, version 3, * the terms of the AGPL are supplemented with the following terms: * * "HELIUM V" and "HELIUM 5" are registered trademarks of * HELIUM V IT-Solutions GmbH. The licensing of the program under the * AGPL does not imply a trademark license. Therefore any rights, title and * interest in our trademarks remain entirely with us. If you want to propagate * modified versions of the Program under the name "HELIUM V" or "HELIUM 5", * you may only do so if you have a written permission by HELIUM V IT-Solutions * GmbH (to acquire a permission please contact HELIUM V IT-Solutions * at trademark@heliumv.com). * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * * Contact: developers@heliumv.com ******************************************************************************/ package com.lp.server.system.fastlanereader; import java.util.Iterator; import java.util.List; import java.util.Locale; import org.hibernate.HibernateException; import org.hibernate.Query; import org.hibernate.ScrollableResults; import org.hibernate.Session; import org.hibernate.SessionFactory; import com.lp.server.system.fastlanereader.generated.FLRTheClient; import com.lp.server.system.service.TheClientFac; import com.lp.server.util.fastlanereader.FLRSessionFactory; import com.lp.server.util.fastlanereader.UseCaseHandler; import com.lp.server.util.fastlanereader.service.query.FilterBlock; import com.lp.server.util.fastlanereader.service.query.FilterKriterium; import com.lp.server.util.fastlanereader.service.query.QueryResult; import com.lp.server.util.fastlanereader.service.query.SortierKriterium; import com.lp.server.util.fastlanereader.service.query.TableInfo; import com.lp.util.EJBExceptionLP; public class TheClientHandler extends UseCaseHandler { /** * */ private static final long serialVersionUID = 1L; /** * getPageAt * * @param rowIndex * Integer * @return QueryResult */ public QueryResult getPageAt(Integer rowIndex) { QueryResult result = null; SessionFactory factory = FLRSessionFactory.getFactory(); Session session = null; try { int colCount = getTableInfo().getColumnClasses().length; int pageSize = PAGE_SIZE; int startIndex = Math.max(rowIndex.intValue() - (pageSize / 2), 0); int endIndex = startIndex + pageSize - 1; session = factory.openSession(); String queryString = this.getFromClause() + this.buildWhereClause() + this.buildOrderByClause(); Query query = session.createQuery(queryString); query.setFirstResult(startIndex); query.setMaxResults(pageSize); List<?> resultList = query.list(); Iterator<?> resultListIterator = resultList.iterator(); Object[][] rows = new Object[resultList.size()][colCount]; int row = 0; int col = 0; while (resultListIterator.hasNext()) { FLRTheClient theClient = (FLRTheClient) resultListIterator.next(); // flr: 2 rows[row][col++] = theClient.getCnr(); rows[row][col++] = theClient.getC_benutzername(); rows[row][col++] = theClient.getC_mandant(); rows[row][col++] = theClient.getC_uisprache(); rows[row][col++] = theClient.getC_konzernsprache(); rows[row][col++] = theClient.getT_loggedin() == null ? null : new java.sql.Timestamp(theClient.getT_loggedin().getTime()); rows[row][col++] = theClient.getT_loggedout() == null ? null : new java.sql.Timestamp(theClient.getT_loggedout().getTime()); row++; col = 0; } result = new QueryResult(rows, this.getRowCount(), startIndex, endIndex, 0); } catch (Exception e) { throw new EJBExceptionLP(EJBExceptionLP.FEHLER_FLR, e); } finally { try { session.close(); } catch (HibernateException he) { throw new EJBExceptionLP(EJBExceptionLP.FEHLER_FLR, he); } } return result; } /** * buildOrderByClause * * @return String */ private String buildOrderByClause() { StringBuffer orderBy = new StringBuffer(""); if (this.getQuery() != null) { SortierKriterium[] kriterien = this.getQuery().getSortKrit(); boolean sortAdded = false; if (kriterien != null && kriterien.length > 0) { for (int i = 0; i < kriterien.length; i++) { if (kriterien[i].isKrit) { if (sortAdded) { orderBy.append(", "); } sortAdded = true; // flr: 3 orderBy.append(" theclient." + kriterien[i].kritName); orderBy.append(" "); orderBy.append(kriterien[i].value); } } } else { // flr: 4 // no sort criteria found, add default sort if (sortAdded) { orderBy.append(", "); } orderBy.append(" theclient.t_loggedin DESC "); sortAdded = true; } if (orderBy.indexOf(" theclient.t_loggedin") < 0) { // unique sort required because otherwise rowNumber of // selectedId // within sort() method may be different from the position of // selectedId // as returned in the page of getPageAt(). if (sortAdded) { orderBy.append(", "); } orderBy.append(" theclient.t_loggedin "); sortAdded = true; } if (sortAdded) { orderBy.insert(0, " ORDER BY "); } } return orderBy.toString(); } /** * buildWhereClause * * @return String */ private String buildWhereClause() { StringBuffer where = new StringBuffer(""); if (this.getQuery() != null && this.getQuery().getFilterBlock() != null && this.getQuery().getFilterBlock().filterKrit != null) { FilterBlock filterBlock = this.getQuery().getFilterBlock(); FilterKriterium[] filterKriterien = this.getQuery().getFilterBlock().filterKrit; String booleanOperator = filterBlock.boolOperator; boolean filterAdded = false; for (int i = 0; i < filterKriterien.length; i++) { if (filterKriterien[i].isKrit) { if (filterAdded) { where.append(" " + booleanOperator); } filterAdded = true; // flr: 5 where.append(" theclient." + filterKriterien[i].kritName); where.append(" " + filterKriterien[i].operator); where.append(" " + filterKriterien[i].value); } } if (filterAdded) { where.insert(0, " WHERE"); } } return where.toString(); } /** * getFromClause * * @return String */ private String getFromClause() { // flr: 6 Hochinteressant: hier wird der alias theclient festgelegt, // der hier ueberall verwendent wird return "from FLRTheClient theclient "; } /** * getRowCountFromDataBase * * @return int * @throws EJBExceptionLP */ protected long getRowCountFromDataBase() throws EJBExceptionLP { long rowCount = 0; SessionFactory factory = FLRSessionFactory.getFactory(); Session session = null; try { session = factory.openSession(); String queryString = "select count(*) " + this.getFromClause() + this.buildWhereClause(); Query query = session.createQuery(queryString); List<?> rowCountResult = query.list(); if (rowCountResult != null && rowCountResult.size() > 0) { rowCount = ((Long) rowCountResult.get(0)).longValue(); } } catch (Exception e) { throw new EJBExceptionLP(EJBExceptionLP.FEHLER, e); } finally { if (session != null) { try { session.close(); } catch (HibernateException he) { throw new EJBExceptionLP(EJBExceptionLP.FEHLER, he); } } } return rowCount; } /** * getTableInfo * * @return TableInfo */ public TableInfo getTableInfo() { if (super.getTableInfo() == null) { String mandantCNr = theClientDto.getMandant(); Locale locUI = theClientDto.getLocUi(); setTableInfo(new TableInfo( // flr: 6 die javadatentypen der aller spalten new Class[] { String.class, String.class, String.class, Locale.class, Locale.class, java.sql.Timestamp.class, java.sql.Timestamp.class }, // flr: 7 die spaltenueberschriften - clienttabelle new String[] { "User-ID", getTextRespectUISpr("client.benutzername", mandantCNr, locUI), getTextRespectUISpr("report.mandant", mandantCNr, locUI), getTextRespectUISpr("client.uisprache", mandantCNr, locUI), getTextRespectUISpr("client.konzernsprache", mandantCNr, locUI), getTextRespectUISpr("client.logondatum", mandantCNr, locUI), getTextRespectUISpr("client.logoutdatum", mandantCNr, locUI), }, // flr: 8 die hibernatespaltenname new String[] { "cnr", TheClientFac.FLRSPALTE_C_BENUTZERNAME, "mandant_c_nr", TheClientFac.FLRSPALTE_C_UILOCALE, TheClientFac.FLRSPALTE_C_KONZERNLOCALE, TheClientFac.FLRSPALTE_T_LOGGEDIN, TheClientFac.FLRSPALTE_T_LOGGEDOUT })); } return super.getTableInfo(); } /** * sort * * @param sortierKriterien * SortierKriterium[] * @param selectedId * Object * @return QueryResult */ public QueryResult sort(SortierKriterium[] sortierKriterien, Object selectedId) { this.getQuery().setSortKrit(sortierKriterien); QueryResult result = null; int rowNumber = 0; if (selectedId != null /* && ( (Integer) selectedId).intValue() >= 0 */) { SessionFactory factory = FLRSessionFactory.getFactory(); Session session = null; try { session = factory.openSession(); // flr: 7 String queryString = "select theclient.cnr from FLRTheClient theclient " + this.buildWhereClause() + this.buildOrderByClause(); Query query = session.createQuery(queryString); ScrollableResults scrollableResult = query.scroll(); boolean idFound = false; if (scrollableResult != null) { scrollableResult.beforeFirst(); while (scrollableResult.next()) { // flr: 8 String id = (String) scrollableResult.getString(0); if (selectedId.equals(id)) { rowNumber = scrollableResult.getRowNumber(); break; } } } } catch (Exception e) { throw new EJBExceptionLP(EJBExceptionLP.FEHLER_FLR, e); } finally { try { session.close(); } catch (HibernateException he) { throw new EJBExceptionLP(EJBExceptionLP.FEHLER_FLR, he); } } } if (rowNumber < 0 || rowNumber >= this.getRowCount()) { rowNumber = 0; } result = this.getPageAt(new Integer(rowNumber)); result.setIndexOfSelectedRow(rowNumber); return result; } }