Java tutorial
/* * B3P Kaartenbalie is a OGC WMS/WFS proxy that adds functionality * for authentication/authorization, pricing and usage reporting. * * Copyright 2006, 2007, 2008 B3Partners BV * * This file is part of B3P Kaartenbalie. * * B3P Kaartenbalie is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * B3P Kaartenbalie 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with B3P Kaartenbalie. If not, see <http://www.gnu.org/licenses/>. */ package nl.b3p.kaartenbalie.struts; import java.sql.SQLException; import java.util.Set; import javax.persistence.EntityManager; import javax.persistence.EntityTransaction; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import nl.b3p.commons.struts.CrudAction; import nl.b3p.kaartenbalie.core.server.persistence.MyEMFDatabase; import nl.b3p.kaartenbalie.service.LayerTreeSupport; import nl.b3p.ogc.wfs.v110.WfsLayer; import nl.b3p.wms.capabilities.Layer; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.validator.DynaValidatorForm; import org.json.JSONObject; public class KaartenbalieCrudAction extends CrudAction { private static final Log log = LogFactory.getLog(KaartenbalieCrudAction.class); protected static final String UNKNOWN_SES_USER_ERROR_KEY = "error.sesuser"; protected static final String ACKNOWLEDGE_MESSAGES = "acknowledgeMessages"; protected ActionForward getUnspecifiedAlternateForward(ActionMapping mapping, HttpServletRequest request) { return mapping.findForward(FAILURE); } /** Execute method which handles all incoming request. * * @param mapping action mapping * @param dynaForm dyna validator form * @param request servlet request * @param response servlet response * * @return ActionForward defined by Apache foundation * * @throws Exception */ // <editor-fold defaultstate="" desc="execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) method."> @Override public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { Object identity = null; try { identity = MyEMFDatabase.createEntityManager(MyEMFDatabase.MAIN_EM); ActionForward forward = null; String msg = null; EntityManager em = getEntityManager(); EntityTransaction tx = em.getTransaction(); try { tx.begin(); forward = super.execute(mapping, form, request, response); tx.commit(); return forward; } catch (Exception e) { if (tx.isActive()) { tx.rollback(); } log.error("Exception occured, rollback", e); if (e instanceof org.hibernate.JDBCException) { msg = e.toString(); SQLException sqle = ((org.hibernate.JDBCException) e).getSQLException(); msg = msg + ": " + sqle; SQLException nextSqlE = sqle.getNextException(); if (nextSqlE != null) { msg = msg + ": " + nextSqlE; } } else if (e instanceof java.sql.SQLException) { msg = e.toString(); SQLException nextSqlE = ((java.sql.SQLException) e).getNextException(); if (nextSqlE != null) { msg = msg + ": " + nextSqlE; } } else { msg = e.toString(); } addAlternateMessage(mapping, request, null, msg); } try { tx.begin(); prepareMethod((DynaValidatorForm) form, request, LIST, EDIT); tx.commit(); } catch (Exception e) { if (tx.isActive()) { tx.rollback(); } log.error("Exception occured in second session, rollback", e); addAlternateMessage(mapping, request, null, e.toString()); } } catch (Throwable e) { log.error("Exception occured while getting EntityManager: ", e); addAlternateMessage(mapping, request, null, e.toString()); } finally { log.debug("Closing entity manager ....."); MyEMFDatabase.closeEntityManager(identity, MyEMFDatabase.MAIN_EM); } return getAlternateForward(mapping, request); } protected static EntityManager getEntityManager() throws Exception { log.debug("Getting entity manager ......"); return MyEMFDatabase.getEntityManager(MyEMFDatabase.MAIN_EM); } public Layer getLayerByUniqueName(String uniqueName) throws Exception { EntityManager em = getEntityManager(); return LayerTreeSupport.getLayerByUniqueName(em, uniqueName); } public WfsLayer getWfsLayerByUniqueName(String uniqueName) throws Exception { EntityManager em = getEntityManager(); return LayerTreeSupport.getWfsLayerByUniqueName(em, uniqueName); } protected String getLayerID(DynaValidatorForm dynaForm) { return dynaForm.getString("id"); } public static JSONObject createTree(String rootName) throws Exception { return createTree(rootName, null, false); } public static JSONObject createTree(String rootName, Set organizationLayers) throws Exception { return createTree(rootName, organizationLayers, true); } public static JSONObject createTree(String rootName, Set organizationLayers, boolean checkLayers) throws Exception { EntityManager em = getEntityManager(); return LayerTreeSupport.createTree(em, rootName, organizationLayers, checkLayers); } public static JSONObject createWfsTree(String rootName) throws Exception { return createWfsTree(rootName, null, false); } public static JSONObject createWfsTree(String rootName, Set organizationLayers, boolean checkLayers) throws Exception { EntityManager em = getEntityManager(); return LayerTreeSupport.createWfsTree(em, rootName, organizationLayers, checkLayers); } }