/** * $RCSfile$ * $Revision$ * $Date$ * * Copyright (C) 2004 Jive Software. All rights reserved. * * This software is published under the terms of the GNU Public License (GPL), * a copy of which is included in this distribution. */ package org.jivesoftware.messenger.vcard; import org.dom4j.Element; import org.jivesoftware.util.*; import java.util.StringTokenizer; /** * Manages VCard information for users. * * @author Matt Tucker */ public class VCardManager { private static VCardProvider provider; private static VCardManager instance = new VCardManager(); private Cache vcardCache; static { // Load a VCard provider. String className = JiveGlobals.getXMLProperty("provider.vcard.className", DefaultVCardProvider.class.getName()); try { Class c = ClassUtils.forName(className); provider = (VCardProvider)c.newInstance(); } catch (Exception e) { Log.error("Error loading vcard provider: " + className, e); provider = new DefaultVCardProvider(); } } public static VCardManager getInstance() { return instance; } /** * Returns the currently-installed VCardProvider. <b>Warning:</b> in virtually all * cases the vcard provider should not be used directly. Instead, the appropriate * methods in VCardManager should be called. Direct access to the vcard provider is * only provided for special-case logic. * * @return the current VCardProvider. */ public static VCardProvider getProvider() { return provider; } private VCardManager() { CacheManager.initializeCache("vcardCache", 512 * 1024); vcardCache = CacheManager.getCache("vcardCache"); } /** * Returns the user's vCard information for a given vcard property name. If the property * has no defined text then an empty string will be returned. However, if the property * does not exist then a <tt>null</tt> value will be answered. Advanced user systems can * use vCard information to link to user directory information or store other relevant * user information.</p> * * Note that many elements in the vCard may have the same path so the returned value in that * case will be the first found element. For instance, "ADR:STREET" may be present in * many addresses of the user. Use {@link #getVCard(String)} to get the whole vCard of * the user. * * @param username The username of the user to return his vCard property. * @param name The name of the vcard property to retrieve encoded with ':' to denote * the path. * @return The vCard value found */ public String getVCardProperty(String username, String name) { String answer = null; Element vCardElement = getOrLoadVCard(username); if (vCardElement != null) { // A vCard was found for this user so now look for the correct element Element subElement = null; StringTokenizer tokenizer = new StringTokenizer(name, ":"); while (tokenizer.hasMoreTokens()) { String tok = tokenizer.nextToken(); if (subElement == null) { subElement = vCardElement.element(tok); } else { subElement = subElement.element(tok); } if (subElement == null) { break; } } if (subElement != null) { answer = subElement.getTextTrim(); } } return answer; } /** * Sets the user's vCard information. The new vCard information will be persistent. Advanced * user systems can use vCard information to link to user directory information or store * other relevant user information. * * @param username The username of the user to set his new vCard. * @param vCardElement The DOM element sent by the user as his new vcard. * @throws Exception if an error occured while storing the new vCard. */ public void setVCard(String username, Element vCardElement) throws Exception { if (provider.isReadOnly()) { throw new UnsupportedOperationException("VCard provider is read-only."); } Element oldVCard = getOrLoadVCard(username); // See if we need to update the vCard or insert a new one. if (oldVCard != null) { // Only update the vCard in the database if the vCard has changed. if (!oldVCard.equals(vCardElement)) { try { provider.updateVCard(username, vCardElement); } catch (NotFoundException e) { Log.warn("Tried to update a vCard that does not exist", e); provider.createVCard(username, vCardElement); } } } else { try { provider.createVCard(username, vCardElement); } catch (AlreadyExistsException e) { Log.warn("Tried to create a vCard when one already exist", e); provider.updateVCard(username, vCardElement); } } vcardCache.put(username, vCardElement); } /** * Deletes the user's vCard from the user account. * * @param username The username of the user to delete his vCard. */ public void deleteVCard(String username) { if (provider.isReadOnly()) { throw new UnsupportedOperationException("VCard provider is read-only."); } Element oldVCard = getOrLoadVCard(username); if (oldVCard != null) { vcardCache.remove(username); // Delete the property from the DB if it was present in memory provider.deleteVCard(username); } } /** * Returns the vCard of a given user or null if none was defined before. Changes to the * returned vCard will not be stored in the database. Use the returned vCard as a * read-only vCard. * * @return the vCard of a given user. */ public Element getVCard(String username) { Element vCardElement = getOrLoadVCard(username); return vCardElement == null ? null : vCardElement.createCopy(); } private Element getOrLoadVCard(String username) { Element vCardElement = (Element) vcardCache.get(username); if (vCardElement == null) { vCardElement = provider.loadVCard(username); if (vCardElement != null) { vcardCache.put(username, vCardElement); } } return vCardElement; } }