Group.java 18.1 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517
/**
 * $RCSfile$
 * $Revision$
 * $Date$
 *
 * 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.group;

import org.jivesoftware.util.Log;
import org.jivesoftware.util.Cacheable;
import org.jivesoftware.util.CacheSizes;
import org.jivesoftware.database.DbConnectionManager;
import org.jivesoftware.messenger.event.GroupEventDispatcher;
import org.jivesoftware.messenger.user.UserManager;
import org.jivesoftware.stringprep.Stringprep;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * Groups organize users into a single entity for easier management.
 *
 * @see GroupManager#createGroup(String)
 *
 * @author Matt Tucker
 */
public class Group implements Cacheable {

    private static final String LOAD_PROPERTIES =
        "SELECT name, propValue FROM jiveGroupProp WHERE groupName=?";
    private static final String DELETE_PROPERTY =
        "DELETE FROM jiveGroupProp WHERE groupName=? AND name=?";
    private static final String UPDATE_PROPERTY =
        "UPDATE jiveGroupProp SET propValue=? WHERE name=? AND groupName=?";
    private static final String INSERT_PROPERTY =
        "INSERT INTO jiveGroupProp (groupName, name, propValue) VALUES (?, ?, ?)";

    private GroupProvider provider;
    private GroupManager groupManager;
    private String name;
    private String description;
    private Map<String, String> properties;
    private Collection<String> members;
    private Collection<String> administrators;

    /**
     * Constructs a new group. Note: this constructor is intended for implementors of the
     * {@link GroupProvider} interface. To create a new group, use the
     * {@link GroupManager#createGroup(String)} method. 
     *
     * @param provider the group provider.
     * @param name the name.
     * @param description the description.
     * @param members a Collection of the group members.
     * @param administrators a Collection of the group administrators.
     */
    public Group(GroupProvider provider, String name, String description,
            Collection<String> members, Collection<String> administrators)
    {
        this.provider = provider;
        this.groupManager = GroupManager.getInstance();
        this.name = name;
        this.description = description;
        this.members = members;
        this.administrators = administrators;
    }

    /**
     * Returns the name of the group. For example, 'XYZ Admins'.
     *
     * @return the name of the group.
     */
    public String getName() {
        return name;
    }

    /**
     * Sets the name of the group. For example, 'XYZ Admins'. This
     * method is restricted to those with group administration permission.
     *
     * @param name the name for the group.
     */
    public void setName(String name) {
        try {
            String originalName = this.name;
            provider.setName(this.name, name);
            groupManager.groupCache.remove(this.name);
            this.name = name;
            groupManager.groupCache.put(name, this);

            // Fire event.
            Map<String, Object> params = new HashMap<String, Object>();
            params.put("type", "nameModified");
            params.put("originalValue", originalName);
            GroupEventDispatcher.dispatchEvent(this, GroupEventDispatcher.EventType.group_modified,
                    params);
        }
        catch (Exception e) {
            Log.error(e);
        }
    }

    /**
     * Returns the description of the group. The description often
     * summarizes a group's function, such as 'Administrators of the XYZ forum'.
     *
     * @return the description of the group.
     */
    public String getDescription() {
        return description;
    }

    /**
     * Sets the description of the group. The description often
     * summarizes a group's function, such as 'Administrators of
     * the XYZ forum'. This method is restricted to those with group
     * administration permission.
     *
     * @param description the description of the group.
     */
    public void setDescription(String description) {
        try {
            String originalDescription = this.description;
            provider.setDescription(name, description);
            this.description = description;
            // Fire event.
            Map<String, Object> params = new HashMap<String, Object>();
            params.put("type", "descriptionModified");
            params.put("originalValue", originalDescription);
            GroupEventDispatcher.dispatchEvent(this,
                    GroupEventDispatcher.EventType.group_modified, params);
        }
        catch (Exception e) {
            Log.error(e);
        }
    }

    /**
     * Returns all extended properties of the group. Groups
     * have an arbitrary number of extended properties.
     *
     * @return the extended properties.
     */
    public Map<String,String> getProperties() {
        synchronized (this) {
            if (properties == null) {
                properties = new ConcurrentHashMap<String, String>();
                loadProperties();
            }
        }
        // Return a wrapper that will intercept add and remove commands.
        return new PropertiesMap();
    }

    /**
     * Returns a Collection of the group administrators.
     *
     * @return a Collection of the group administrators.
     */
    public Collection<String> getAdmins() {
        // Return a wrapper that will intercept add and remove commands.
        return new MemberCollection(administrators, true);
    }

    /**
     * Returns a Collection of the group members.
     *
     * @return a Collection of the group members.
     */
    public Collection<String> getMembers() {
        // Return a wrapper that will intercept add and remove commands.
        return new MemberCollection(members, false);
    }

    /**
     * Returns true if the provided username belongs to a user of the group.
     *
     * @param username the username to check.
     * @return true if the provided username belongs to a user of the group.
     */
    public boolean isUser(String username) {
        if  (username != null) {
        	return members.contains(username) || administrators.contains(username);
        } else {
            return false;
        }
    }

    public int getCachedSize() {
        // Approximate the size of the object in bytes by calculating the size
        // of each field.
        int size = 0;
        size += CacheSizes.sizeOfObject();              // overhead of object
        size += CacheSizes.sizeOfString(name);
        size += CacheSizes.sizeOfString(description);
        return size;
    }

    /**
     * Collection implementation that notifies the GroupProvider of any
     * changes to the collection.
     */
    private class MemberCollection extends AbstractCollection {

        private Collection<String> users;
        private boolean adminCollection;

        public MemberCollection(Collection<String> users, boolean adminCollection) {
            this.users = users;
            this.adminCollection = adminCollection;
        }

        public Iterator iterator() {
            return new Iterator() {

                Iterator iter = users.iterator();
                Object current = null;

                public boolean hasNext() {
                    return iter.hasNext();
                }

                public Object next() {
                    current = iter.next();
                    return current;
                }

                public void remove() {
                    if (current == null) {
                        throw new IllegalStateException();
                    }
                    String user = (String)current;
                    // Remove the user from the collection in memory.
                    iter.remove();
                    // Remove the group user from the backend store.
                    provider.deleteMember(name, user);
                    // Fire event.
                    if (adminCollection) {
                        Map<String, String> params = new HashMap<String, String>();
                        params.put("admin", user);
                        GroupEventDispatcher.dispatchEvent(Group.this,
                                GroupEventDispatcher.EventType.admin_removed, params);
                    }
                    else {
                        Map<String, String> params = new HashMap<String, String>();
                        params.put("member", user);
                        GroupEventDispatcher.dispatchEvent(Group.this,
                                GroupEventDispatcher.EventType.member_removed, params);
                    }
                }
            };
        }

        public int size() {
            return users.size();
        }

        public boolean add(Object member) {
            String username = (String) member;
            try {
                username = Stringprep.nodeprep(username);
                UserManager.getInstance().getUser(username);
            }
            catch (Exception e) {
                throw new IllegalArgumentException("Invalid user.", e);
            }
            // Find out if the user was already a group user
            boolean alreadyGroupUser = false;
            if (adminCollection) {
                alreadyGroupUser = members.contains(username);
            }
            else {
                alreadyGroupUser = administrators.contains(username);
            }
            if (users.add(username)) {
                if (alreadyGroupUser) {
                    // Update the group user privileges in the backend store.
                    provider.updateMember(name, username, adminCollection);
                }
                else {
                    // Add the group user to the backend store.
                    provider.addMember(name, username, adminCollection);
                }

                // Fire event.
                if (adminCollection) {
                    Map<String, String> params = new HashMap<String, String>();
                    params.put("admin", username);
                    if (alreadyGroupUser) {
                        GroupEventDispatcher.dispatchEvent(Group.this,
                                    GroupEventDispatcher.EventType.member_removed, params);
                    }
                    GroupEventDispatcher.dispatchEvent(Group.this,
                                GroupEventDispatcher.EventType.admin_added, params);
                }
                else {
                    Map<String, String> params = new HashMap<String, String>();
                    params.put("member", username);
                    if (alreadyGroupUser) {
                        GroupEventDispatcher.dispatchEvent(Group.this,
                                    GroupEventDispatcher.EventType.admin_removed, params);
                    }
                    GroupEventDispatcher.dispatchEvent(Group.this,
                                GroupEventDispatcher.EventType.member_added, params);
                }
                // If the user was a member that became an admin or vice versa then remove the
                // user from the other collection
                if (alreadyGroupUser) {
                    if (adminCollection) {
                        if (members.contains(username)) {
                            members.remove(username);
                        }
                    }
                    else {
                        if (administrators.contains(username)) {
                            administrators.remove(username);
                        }
                    }
                }
                return true;
            }
            return false;
        }
    }

    /**
     * Map implementation that updates the database when properties are modified.
     */
    private class PropertiesMap extends AbstractMap {

        public Object put(Object key, Object value) {
            if (key == null || value == null) {
                throw new NullPointerException();
            }
            Map<String, Object> eventParams = new HashMap<String, Object>();
            Object answer;
            String keyString = (String) key;
            synchronized (keyString.intern()) {
                if (properties.containsKey(keyString)) {
                    String originalValue = properties.get(keyString);
                    answer = properties.put(keyString, (String)value);
                    updateProperty(keyString, (String)value);
                    // Configure event.
                    eventParams.put("type", "propertyModified");
                    eventParams.put("propertyKey", key);
                    eventParams.put("originalValue", originalValue);
                }
                else {
                    answer = properties.put(keyString, (String)value);
                    insertProperty(keyString, (String)value);
                    // Configure event.
                    eventParams.put("type", "propertyAdded");
                    eventParams.put("propertyKey", key);
                }
            }
            // Fire event.
            GroupEventDispatcher.dispatchEvent(Group.this,
                    GroupEventDispatcher.EventType.group_modified, eventParams);
            return answer;
        }

        public Set<Entry> entrySet() {
            return new PropertiesEntrySet();
        }
    }

    /**
     * Set implementation that updates the database when properties are deleted.
     */
    private class PropertiesEntrySet extends AbstractSet {

        public int size() {
            return properties.entrySet().size();
        }

        public Iterator iterator() {
            return new Iterator() {

                Iterator iter = properties.entrySet().iterator();
                Map.Entry current = null;

                public boolean hasNext() {
                    return iter.hasNext();
                }

                public Object next() {
                    current = (Map.Entry)iter.next();
                    return current;
                }

                public void remove() {
                    if (current == null) {
                        throw new IllegalStateException();
                    }
                    String key = (String)current.getKey();
                    deleteProperty(key);
                    iter.remove();
                    // Fire event.
                    Map<String, Object> params = new HashMap<String, Object>();
                    params.put("type", "propertyDeleted");
                    params.put("propertyKey", key);
                    GroupEventDispatcher.dispatchEvent(Group.this,
                        GroupEventDispatcher.EventType.group_modified, params);
                }
            };
        }
    }

    private void loadProperties() {
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = con.prepareStatement(LOAD_PROPERTIES);
            pstmt.setString(1, name);
            ResultSet rs = pstmt.executeQuery();
            while (rs.next()) {
                String key = rs.getString(1);
                String value = rs.getString(2);
                if (key != null) {
                    if (value == null) {
                        value = "";
                        Log.warn("There is a group property whose value is null of Group: " + name);
                    }
                    properties.put(key, value);
                }
                else {
                    Log.warn("There is a group property whose key is null of Group: " + name);
                }
            }
            rs.close();
        }
        catch (SQLException sqle) {
            Log.error(sqle);
        }
        finally {
            try { if (pstmt != null) pstmt.close(); }
            catch (Exception e) { Log.error(e); }
            try { if (con != null) con.close(); }
            catch (Exception e) { Log.error(e); }
        }
    }

    private void insertProperty(String propName, String propValue) {
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = con.prepareStatement(INSERT_PROPERTY);
            pstmt.setString(1, name);
            pstmt.setString(2, propName);
            pstmt.setString(3, propValue);
            pstmt.executeUpdate();
        }
        catch (SQLException e) {
            Log.error(e);
        }
        finally {
            try { if (pstmt != null) pstmt.close(); }
            catch (Exception e) { Log.error(e); }
            try { if (con != null) con.close(); }
            catch (Exception e) { Log.error(e); }
        }
    }

    private void updateProperty(String propName, String propValue) {
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = con.prepareStatement(UPDATE_PROPERTY);
            pstmt.setString(1, propValue);
            pstmt.setString(2, propName);
            pstmt.setString(3, name);
            pstmt.executeUpdate();
        }
        catch (SQLException e) {
            Log.error(e);
        }
        finally {
            try { if (pstmt != null) pstmt.close(); }
            catch (Exception e) { Log.error(e); }
            try { if (con != null) con.close(); }
            catch (Exception e) { Log.error(e); }
        }
    }

    private void deleteProperty(String propName) {
        Connection con = null;
        PreparedStatement pstmt = null;
        try {
            con = DbConnectionManager.getConnection();
            pstmt = con.prepareStatement(DELETE_PROPERTY);
            pstmt.setString(1, name);
            pstmt.setString(2, propName);
            pstmt.executeUpdate();
        }
        catch (SQLException e) {
            Log.error(e);
        }
        finally {
            try { if (pstmt != null) pstmt.close(); }
            catch (Exception e) { Log.error(e); }
            try { if (con != null) con.close(); }
            catch (Exception e) { Log.error(e); }
        }
    }
}