Java tutorial
/* * Copyright (C) 2007 Unicon, Inc. * * This program 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 2 * of the License, or (at your option) any later version. * * 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this distribution. It is also available here: * http://www.fsf.org/licensing/licenses/gpl.html * * As a special exception to the terms and conditions of version * 2 of the GPL, you may redistribute this Program in connection * with Free/Libre and Open Source Software ("FLOSS") applications * as described in the GPL FLOSS exception. You should have received * a copy of the text describing the FLOSS exception along with this * distribution. */ package net.unicon.academus.apps.messaging.engine; import net.unicon.academus.apps.ErrorMessage; import net.unicon.academus.apps.messaging.AttachmentsHelper; import net.unicon.academus.apps.messaging.MessagingApplicationContext; import net.unicon.academus.apps.messaging.MessagingUserContext; import net.unicon.mercury.IFolder; import net.unicon.mercury.IMessage; import net.unicon.mercury.MercuryException; import net.unicon.penelope.IDecision; import net.unicon.penelope.IDecisionCollection; import net.unicon.penelope.ISelection; import net.unicon.warlock.fac.AbstractWarlockFactory; import net.unicon.warlock.fac.SimpleActionResponse; import net.unicon.warlock.Handle; import net.unicon.warlock.IAction; import net.unicon.warlock.IActionResponse; import net.unicon.warlock.IScreen; import net.unicon.warlock.IUserContext; import net.unicon.warlock.IWarlockFactory; import net.unicon.warlock.StateMachine; import net.unicon.warlock.WarlockException; import net.unicon.warlock.XmlFormatException; import org.dom4j.Attribute; import org.dom4j.Element; public final class ExportMessageAction extends AbstractWarlockFactory.AbstractAction { // Instance Members. private MessagingApplicationContext app; private IScreen screenList; private IScreen screenDetail; private IScreen screenExport; /* * Public API. */ public static IAction parse(Element e, IWarlockFactory owner) throws WarlockException { // Assertions. if (e == null) { String msg = "Argument 'e [Element]' cannot be null."; throw new IllegalArgumentException(msg); } if (!e.getName().equals("action")) { String msg = "Argument 'e [Element]' must be an <action> element."; throw new IllegalArgumentException(msg); } if (owner == null) { String msg = "Argument 'owner+' cannot be null."; throw new IllegalArgumentException(msg); } // Handle. Attribute h = e.attribute("handle"); if (h == null) { String msg = "Element <action> is missing required attribute " + "'handle'."; throw new XmlFormatException(msg); } Handle handle = Handle.create(h.getValue()); // Choices. String[] choices = new String[0]; Attribute p = e.attribute("inpt"); if (p != null) { choices = p.getValue().split(","); } return new ExportMessageAction(owner, handle, choices); } public void init(StateMachine m) { // Assertions. if (m == null) { String msg = "Argument 'm [StateMachine]' cannot be null."; throw new IllegalArgumentException(msg); } app = (MessagingApplicationContext) m.getContext(); screenExport = m.getScreen(Handle.create("message_export")); screenList = m.getScreen(Handle.create("message_list")); screenDetail = m.getScreen(Handle.create("message_detail_view")); } public IActionResponse invoke(IDecisionCollection[] decisions, IUserContext ctx) throws WarlockException { // Assertions. if (decisions == null) { String msg = "Argument 'decisions' cannot be null."; throw new IllegalArgumentException(msg); } if (ctx == null) { String msg = "Argument 'ctx' cannot be null."; throw new IllegalArgumentException(msg); } MessagingUserContext muc = (MessagingUserContext) ctx; IDecision d = decisions[0].getDecision("selectedItems"); ISelection[] selections = d.getSelections(); IFolder f = muc.getFolderSelection(); // For error handling String msg = null; String solution = null; if (selections.length == 0) { msg = "No messages selected for exporting."; solution = "Please select the messages you would like to export, then press the Export button."; } else { // the user selected targets... try { IMessage[] targets = new IMessage[selections.length]; for (int i = 0; i < selections.length; i++) { String msgId = selections[i].getOption().getHandle().getValue(); targets[i] = f.getMessage(msgId); } muc.setMessageSelection(targets); } catch (MercuryException e) { /* TODO: Log exception! */ e.printStackTrace(System.err); msg = "Error during message selection."; solution = "Please contact a Portal administrator for assistance, or try again."; } } IActionResponse rslt = null; if (msg == null) { // Move to the export screen rslt = new SimpleActionResponse(screenExport, new ExportMessageQuery(muc)); } else { ErrorMessage[] errors = new ErrorMessage[1]; errors[0] = new ErrorMessage("other", "Unable to export message(s). " + msg, solution); if (muc.getDetailPref().getCurrentMessageIndex() != -1) { // Go back to detail view rslt = new SimpleActionResponse(screenDetail, new ReadMessageQuery(muc, errors)); } else { // Cleanup any prepared attachments AttachmentsHelper.cleanupAttachments(muc); // Go to message list rslt = new SimpleActionResponse(screenList, new MessageListQuery(muc, errors)); } } return rslt; } /* * Implementation. */ private ExportMessageAction(IWarlockFactory owner, Handle handle, String[] choices) { super(owner, handle, choices); } }