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.List; import java.util.StringTokenizer; import net.unicon.alchemist.access.AccessRule; import net.unicon.alchemist.access.IAccessEntry; import net.unicon.academus.apps.ErrorMessage; import net.unicon.academus.apps.briefcase.BriefcaseAccessType; 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.DemetriusException; import net.unicon.demetrius.IFolder; import net.unicon.demetrius.IResource; import net.unicon.demetrius.IResourceFactory; import net.unicon.demetrius.OperationTimeoutException; import net.unicon.demetrius.ResourceType; import net.unicon.demetrius.fac.shared.SharedResourceFactory.SharedResource; import net.unicon.penelope.IChoiceCollection; import net.unicon.penelope.IDecision; import net.unicon.penelope.IDecisionCollection; 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 org.dom4j.Attribute; import org.dom4j.Element; public final class DeleteResourcesAction 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 DeleteResourcesAction(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()); } BriefcaseUserContext user = (BriefcaseUserContext) ctx; IFolder f = (IFolder) user.getHistory().getLocation().getObject(); // Make sure the user clicked 'yes' to confirm. IDecisionCollection dCol = decisions[0]; IChoiceCollection cCol = dCol.getChoiceCollection(); IDecision d = dCol.getDecision(cCol.getChoice(net.unicon.penelope.Handle.create("deleteConfirmation"))); ISelection sel = d.getSelections()[0]; boolean deleted = false; String msg = ""; String solution = null; String name = f.getName(); String confirmation = sel.getOption().getHandle().getValue(); boolean confirmed = confirmation.equalsIgnoreCase("yes"); if (confirmed) { // user confirmed the delete... // Make sure the user has delete permission on the parent folder. List access = Arrays.asList(user.getAccessRules(f.getOwner())); if (!access.contains(new AccessRule(BriefcaseAccessType.DELETE, true))) { msg = "User does not have delete access to the context folder"; deleted = false; } else { IResource r = null; try { Iterator it = Arrays.asList(user.getResourceSelection()).iterator(); while (it.hasNext()) { r = (IResource) it.next(); if (r instanceof IFolder) { if (user.getDriveSelection().isSharing()) { // We may need to clean up sharing associations. deleteSharing((IFolder) r, app.getDrive(user.getDriveSelection().getShareTarget()), user.getUsername()); } else { deleteSharedSharing((IFolder) r, user.getDriveSelection()); } } r.getOwner().delete(r); } deleted = true; } catch (OperationTimeoutException ote) { msg = "Operation timed out."; name = r.getName(); deleted = false; } catch (DemetriusException e) { deleted = false; name = r.getName(); msg = "The selected resource may have been renamed or deleted. "; e.printStackTrace(); } } } user.clearResourceSelection(); if (!confirmed || deleted) { return new SimpleActionResponse(screen, new FolderQuery(user.getHistory().getLocation(), app, user)); } else { ErrorMessage[] errors = new ErrorMessage[1]; String problem = "Unable to delete folder '" + name + "'. " + msg; errors[0] = new ErrorMessage("other", problem, solution); return new SimpleActionResponse(screen, new FolderQuery(user.getHistory().getLocation(), app, user, errors)); } } /* * Package API. */ private DeleteResourcesAction(IWarlockFactory owner, Handle handle, String[] choices) { super(owner, handle, choices); // Instance Members. this.screen = null; } private void deleteSharing(IFolder folder, Drive shared, String username) throws DemetriusException { ResourceType[] types = new ResourceType[] { ResourceType.FOLDER }; if (folder.getContents(types).length > 0) { IResource[] subFolders = folder.getContents(types); for (int i = 0; i < subFolders.length; i++) { deleteSharing((IFolder) subFolders[i], shared, username); } } if (folder instanceof IFolder) { // We may need to clean up sharing associations. IResourceFactory movedResource = null; IAccessEntry[] entries = app.getSharedEntries(folder, username, shared); if (entries.length > 0) { // remove old sharing shared.getBroker().removeAccess(entries); } } } private void deleteSharedSharing(IFolder target, Drive shared) throws DemetriusException { if (!(target instanceof SharedResource)) { return; } String rootName = target.getOwner().getRoot().getName(); String username = rootName.substring(rootName.lastIndexOf("(") + 1, rootName.lastIndexOf(")")); IResource iTarget = ((SharedResource) target).getResource(); if (iTarget instanceof IFolder) { deleteSharing((IFolder) iTarget, shared, username); } } }