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.text.DecimalFormat; 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.alchemist.EntityEncoder; import net.unicon.demetrius.IFolder; import net.unicon.penelope.IDecisionCollection; import net.unicon.warlock.Handle; import net.unicon.warlock.IAction; import net.unicon.warlock.IActionResponse; import net.unicon.warlock.IScreen; import net.unicon.warlock.IStateQuery; 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 CheckPermissionAction extends AbstractWarlockFactory.AbstractAction { // Static Members. private static DecimalFormat formatter = new DecimalFormat("##0.##"); // Instance Members. private BriefcaseApplicationContext app; private String toScreen; private IScreen screen; private IScreen folderScreen; /* * 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()); // ToScreen. Attribute s = e.attribute("to-screen"); if (s == null) { String msg = "Element <action> is missing required attribute " + "'to-screen'."; throw new XmlFormatException(msg); } String toScreen = s.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 CheckPermissionAction(owner, handle, choices, toScreen); } 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(toScreen)); folderScreen = 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 buc = (BriefcaseUserContext) ctx; IFolder f = (IFolder) buc.getHistory().getLocation().getObject(); ErrorMessage[] errors = new ErrorMessage[1]; String problem = ""; String msg = ""; String solution = null; boolean hasPermission = true; // Check permissions for ADD List access = Arrays.asList(buc.getAccessRules(f.getOwner())); if (this.toScreen.equals("addedit_folder")) { if (!access.contains(new AccessRule(BriefcaseAccessType.ADD, true))) { msg = "User does not have 'add' access to the context folder."; problem = "Unable to create a folder. " + msg; errors[0] = new ErrorMessage("other", problem, solution); hasPermission = false; } } else if (this.toScreen.equals("addfile")) { if (!access.contains(new AccessRule(BriefcaseAccessType.ADD, true))) { msg = "User does not have 'add' access to the context folder."; problem = "Unable to upload file. " + msg; errors[0] = new ErrorMessage("other", problem, solution); hasPermission = false; } } if (hasPermission) { String sizeLimit = formatSize(buc.getDriveSelection().getMaxFileSize()); StringBuffer state = new StringBuffer(); state.append("<state><settings><upload-limit>").append(sizeLimit) .append("</upload-limit></settings><status>").append("<command>add</command></status>") .append("<location><current><name>").append(EntityEncoder.encodeEntities(f.getName())) .append("</name></current></location>").append("</state>"); return new SimpleActionResponse(screen, new StateQueryImpl(state.toString())); } else { return new SimpleActionResponse(folderScreen, new FolderQuery(buc.getHistory().getLocation(), app, buc, errors)); } } /* * Implementation. */ private CheckPermissionAction(IWarlockFactory owner, Handle handle, String[] choices, String toScreen) { super(owner, handle, choices); // Instance Members. this.app = null; this.toScreen = toScreen; this.screen = null; this.folderScreen = null; } private String formatSize(long size) { StringBuffer formatted = new StringBuffer(); double dSize = size; String units; if (dSize > 1048576) { dSize /= 1048576.0; units = "MB"; } else { dSize /= 1024.0; units = "KB"; } formatted.append(formatter.format(dSize)); formatted.append(" "); formatted.append(units); return formatted.toString(); } /* * Nested Types. */ private static final class StateQueryImpl implements IStateQuery { // Instance Members. private String state; /* * Public API. */ public StateQueryImpl(String state) { // Assertions. if (state == null) { String msg = "Argument 'state' cannot be null."; throw new IllegalArgumentException(msg); } this.state = state; } public String query() { return state; } public IDecisionCollection[] getDecisions() { return new IDecisionCollection[0]; } } }