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.List; import java.util.StringTokenizer; 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.alchemist.access.AccessRule; import net.unicon.demetrius.IFile; import net.unicon.demetrius.IFolder; import net.unicon.demetrius.OperationTimeoutException; import net.unicon.demetrius.ResourceType; 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 org.dom4j.Attribute; import org.dom4j.Element; public final class UpdateFileAction 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 UpdateFileAction(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()); } // User Input. IDecisionCollection dCol = decisions[0]; IChoiceCollection cCol = dCol.getChoiceCollection(); IDecision d = dCol.getDecision(cCol.getChoice(net.unicon.penelope.Handle.create("fileName"))); String name = (String) d.getSelections()[0].getComplement().getValue(); BriefcaseUserContext user = (BriefcaseUserContext) ctx; IFolder f = (IFolder) user.getHistory().getLocation().getObject(); ErrorMessage[] errors = new ErrorMessage[0]; String problem = ""; String msg = ""; String solution = null; // Make the change. try { IFile target = (IFile) user.getResourceSelection()[0]; // Check if user has edit permissions List access = Arrays.asList(user.getAccessRules(f.getOwner())); if (!access.contains(new AccessRule(BriefcaseAccessType.EDIT, true))) { msg = "You do not have edit permissions."; problem = "Unable to edit '" + target.getName() + "'. " + msg; errors = new ErrorMessage[] { new ErrorMessage("other", problem, solution) }; } else { // 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(name)); IDecision nameDecision = store.createDecision(null, nameChoice, new ISelection[] { nameSelection }); IDecisionCollection metaDecisions = store.createDecisionCollection(metaChoices, new IDecision[] { nameDecision }); // Update the folder. f.getOwner().updateResource(metaDecisions, target); } } catch (OperationTimeoutException ote) { errors = new ErrorMessage[] { new ErrorMessage("other", "Operation timed out.", "") }; } catch (Throwable t) { errors = new ErrorMessage[1]; problem = "Unable to update file. " + t.getMessage(); errors = new ErrorMessage[] { new ErrorMessage("other", problem, null) }; } user.clearResourceSelection(); if (errors.length > 0) { return new SimpleActionResponse(screen, new FolderQuery(user.getHistory().getLocation(), app, user, errors)); } return new SimpleActionResponse(screen, new FolderQuery(user.getHistory().getLocation(), app, user)); } /* * Package API. */ private UpdateFileAction(IWarlockFactory owner, Handle handle, String[] choices) { super(owner, handle, choices); // Instance Members. this.screen = null; } }