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.IDecisionCollection; 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 ReadMessageAction extends AbstractWarlockFactory.AbstractAction { // Instance Members. private MessagingApplicationContext app; private IScreen screen; private IScreen errScreen; private String mode; /* * 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(","); } String mode = null; h = e.attribute("mode"); if (h != null) { mode = h.getValue(); } return new ReadMessageAction(owner, handle, choices, mode); } 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(); screen = m.getScreen(Handle.create("message_detail_view")); errScreen = m.getScreen(Handle.create("message_list")); } 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; muc.getDetailPref().reset(); String msgId = null; if (mode != null && mode.equals("report")) msgId = decisions[0].getDecision("readMessageRecipients").getFirstSelectionHandle(); else msgId = decisions[0].getDecision("readMessage").getFirstSelectionHandle(); // For error messages String msg = null; String solution = null; try { IMessage m = null; IMessage[] messages = muc.getMessageList(); int curIndex = -1; for (int i = 0; curIndex == -1 && i < messages.length; i++) { if (messages[i].getId().equals(msgId)) { curIndex = i; m = messages[i]; } } if (m == null) throw new WarlockException("No such message with identifier: " + msgId); // set the message to read if (m.isUnread()) { m.setRead(true); } muc.getDetailPref().setCurrentMessageIndex(curIndex); if (mode != null) muc.getDetailPref().setMode(mode); // Prepare the attachments for download AttachmentsHelper.prepareAttachments(muc, m); } catch (Exception me) { /* TODO: Log exception! */ me.printStackTrace(System.err); msg = "Failed to retrieve message with identifier: " + msgId + ". " + me.getMessage(); solution = "Please contact a Portal administrator for assistance, or try again."; } if (msg != null) { ErrorMessage[] errors = new ErrorMessage[1]; errors[0] = new ErrorMessage("other", "Unable to read message. " + msg, solution); return new SimpleActionResponse(errScreen, new MessageListQuery(muc)); } else { return new SimpleActionResponse(screen, new ReadMessageQuery(muc)); } } /* * Package API. */ private ReadMessageAction(IWarlockFactory owner, Handle handle, String[] choices, String mode) { super(owner, handle, choices); // Instance Members. this.screen = null; this.errScreen = null; this.mode = mode; } }