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.briefcase.engine; import java.util.Arrays; import java.util.Iterator; import java.util.StringTokenizer; import org.dom4j.Attribute; import org.dom4j.Element; import net.unicon.penelope.IChoice; import net.unicon.penelope.IChoiceCollection; import net.unicon.penelope.IDecision; import net.unicon.penelope.IDecisionCollection; import net.unicon.penelope.IEntityStore; import net.unicon.penelope.IOption; import net.unicon.penelope.ISelection; 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 net.unicon.warlock.fac.AbstractWarlockFactory; import net.unicon.warlock.fac.SimpleActionResponse; import net.unicon.warlock.portlet.FileUpload; import net.unicon.academus.apps.ErrorMessage; import net.unicon.academus.apps.briefcase.BriefcaseApplicationContext; import net.unicon.academus.apps.briefcase.BriefcaseUserContext; import net.unicon.academus.apps.briefcase.Drive; import net.unicon.demetrius.IFolder; import net.unicon.demetrius.OperationTimeoutException; import net.unicon.demetrius.ResourceType; public final class UploadAction extends AbstractWarlockFactory.AbstractAction { // Instance Members. private BriefcaseApplicationContext app; private IScreen screen; /* * 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) { StringTokenizer tokens = new StringTokenizer(p.getValue(), ","); choices = new String[tokens.countTokens()]; for (int i = 0; tokens.hasMoreTokens(); i++) { choices[i] = tokens.nextToken(); } } return new UploadAction(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 = (BriefcaseApplicationContext) m.getContext(); screen = m.getScreen(Handle.create("folderview")); } 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); } if (log.isDebugEnabled()) { log.debug("Invoking Briefcase Action: " + getClass().getName()); } // Identify the destination folder. BriefcaseUserContext buc = (BriefcaseUserContext) ctx; IFolder f = (IFolder) buc.getHistory().getLocation().getObject(); boolean uploaded = true; // default... String msg = null; // Add each item. IDecisionCollection dCol = decisions[0]; IChoiceCollection cCol = dCol.getChoiceCollection(); IDecision d = dCol.getDecision(cCol.getChoice(net.unicon.penelope.Handle.create("fileUploads"))); Iterator it = Arrays.asList(d.getSelections()).iterator(); while (uploaded && it.hasNext()) { ISelection s = (ISelection) it.next(); FileUpload fu = (FileUpload) s.getComplement().getValue(); // Check to be sure we don't exceed the size limit. long maxSize = buc.getDriveSelection().getMaxFileSize(); if (maxSize != Drive.NO_MAXIMUM_FILESIZE && fu.getSize() > maxSize) { msg = "The following file exceeds the size limit for file uploads: " + fu.getName(); uploaded = false; break; } try { // File Metadata. IChoiceCollection metaChoices = f.getOwner().getResourceMetadata(ResourceType.FILE); IEntityStore store = metaChoices.getOwner(); IChoice nameChoice = metaChoices.getChoice(net.unicon.penelope.Handle.create("filename")); IOption nameOption = nameChoice.getOptions()[0]; ISelection nameSelection = store.createSelection(nameOption, nameOption.getComplementType().parse(fu.getName())); IDecision nameDecision = store.createDecision(null, nameChoice, new ISelection[] { nameSelection }); IDecisionCollection metaDecisions = store.createDecisionCollection(metaChoices, new IDecision[] { nameDecision }); // Add the file. f.getOwner().addFile(metaDecisions, f, fu.getContents()); // TODO we'll need to handle some errors here... } catch (OperationTimeoutException ote) { msg = "Operation timed out."; uploaded = false; } catch (Throwable t) { msg = t.getMessage(); uploaded = false; } } if (uploaded) { return new SimpleActionResponse(screen, new FolderQuery(buc.getHistory().getLocation(), app, buc)); } else { ErrorMessage[] errors = new ErrorMessage[1]; String problem = "Unable to upload file. " + msg; errors[0] = new ErrorMessage("other", problem, null); return new SimpleActionResponse(screen, new FolderQuery(buc.getHistory().getLocation(), app, buc, errors)); } } /* * Implementation. */ private UploadAction(IWarlockFactory owner, Handle handle, String[] choices) { super(owner, handle, choices); // Instance Members. this.screen = null; } }