RosterItem.java 13 KB
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/**
 * $RCSfile$
 * $Revision$
 * $Date$
 *
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 * Copyright (C) 2004 Jive Software. All rights reserved.
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 *
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 * This software is published under the terms of the GNU Public License (GPL),
 * a copy of which is included in this distribution.
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 */
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package org.jivesoftware.messenger.roster;
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import org.jivesoftware.util.IntEnum;
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import org.jivesoftware.util.Cacheable;
import org.jivesoftware.util.CacheSizes;
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import org.jivesoftware.messenger.group.GroupManager;
import org.jivesoftware.messenger.group.GroupNotFoundException;
import org.jivesoftware.messenger.SharedGroupException;
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import org.xmpp.packet.JID;
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import java.util.*;
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/**
 * <p>Represents a single roster item for a User's Roster.</p>
 * <p>The server doesn't need to know anything about roster groups so they are
 * not stored with easy retrieval or manipulation in mind. The important data
 * elements of a roster item (beyond the jid adddress of the roster entry) includes:</p>
 * <p/>
 * <ul>
 * <li>nick   - A nickname for the user when used in this roster</li>
 * <li>sub    - A subscription type: to, from, none, both</li>
 * <li>ask    - An optional subscription ask status: subscribe, unsubscribe</li>
 * <li>groups - A list of groups to organize roster entries under (e.g. friends, co-workers, etc)</li>
 * </ul>
 *
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 * @author Gaston Dombiak
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 */
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public class RosterItem implements Cacheable {
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    public static class SubType extends IntEnum {
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        protected SubType(String name, int value) {
            super(name, value);
            register(this);
        }

        public static SubType getTypeFromInt(int value) {
            return (SubType)getEnumFromInt(SubType.class, value);
        }
    }

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    public static class AskType extends IntEnum {
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        protected AskType(String name, int value) {
            super(name, value);
            register(this);
        }

        public static AskType getTypeFromInt(int value) {
            return (AskType)getEnumFromInt(AskType.class, value);
        }
    }

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    public static class RecvType extends IntEnum {
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        protected RecvType(String name, int value) {
            super(name, value);
            register(this);
        }

        public static RecvType getTypeFromInt(int value) {
            return (RecvType)getEnumFromInt(RecvType.class, value);
        }
    }

    /**
     * <p>Indicates the roster item should be removed.</p>
     */
    public static final SubType SUB_REMOVE = new SubType("remove", -1);
    /**
     * <p>No subscription is established.</p>
     */
    public static final SubType SUB_NONE = new SubType("none", 0);
    /**
     * <p>The roster owner has a subscription to the roster item's presence.</p>
     */
    public static final SubType SUB_TO = new SubType("to", 1);
    /**
     * <p>The roster item has a subscription to the roster owner's presence.</p>
     */
    public static final SubType SUB_FROM = new SubType("from", 2);
    /**
     * <p>The roster item and owner have a mutual subscription.</p>
     */
    public static final SubType SUB_BOTH = new SubType("both", 3);

    /**
     * <p>The roster item has no pending subscripton requests.</p>
     */
    public static final AskType ASK_NONE = new AskType("", -1);
    /**
     * <p>The roster item has been asked for permission to subscribe to their presence
     * but no response has been received.</p>
     */
    public static final AskType ASK_SUBSCRIBE = new AskType("subscribe", 0);
    /**
     * <p>The roster owner has asked to the roster item to unsubscribe from it's
     * presence but has not received confirmation.</p>
     */
    public static final AskType ASK_UNSUBSCRIBE = new AskType("unsubscribe", 1);

    /**
     * <p>There are no subscriptions that have been received but not presented to the user.</p>
     */
    public static final RecvType RECV_NONE = new RecvType("", -1);
    /**
     * <p>The server has received a subscribe request, but has not forwarded it to the user.</p>
     */
    public static final RecvType RECV_SUBSCRIBE = new RecvType("sub", 1);
    /**
     * <p>The server has received an unsubscribe request, but has not forwarded it to the user.</p>
     */
    public static final RecvType RECV_UNSUBSCRIBE = new RecvType("unsub", 2);

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    protected RecvType recvStatus;
    protected JID jid;
    protected String nickname;
    protected List<String> groups;
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    protected Set<String> sharedGroups = new HashSet<String>();
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    protected SubType subStatus;
    protected AskType askStatus;
    private long rosterID;

    public RosterItem(long id,
                                JID jid,
                                SubType subStatus,
                                AskType askStatus,
                                RecvType recvStatus,
                                String nickname,
                                List<String> groups) {
        this(jid, subStatus, askStatus, recvStatus, nickname, groups);
        this.rosterID = id;
    }

    public RosterItem(JID jid,
                           SubType subStatus,
                           AskType askStatus,
                           RecvType recvStatus,
                           String nickname,
                           List<String> groups) {
        this.jid = jid;
        this.subStatus = subStatus;
        this.askStatus = askStatus;
        this.recvStatus = recvStatus;
        this.nickname = nickname;
        this.groups = new LinkedList<String>();
        if (groups != null) {
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            for (String group : groups) {
                this.groups.add(group);
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            }
        }
    }

    /**
     * <p>Create a roster item from the data in another one.</p>
     *
     * @param item
     */
    public RosterItem(org.xmpp.packet.Roster.Item item) {
        this(item.getJID(),
                getSubType(item),
                getAskStatus(item),
                RosterItem.RECV_NONE,
                item.getName(),
                new LinkedList<String>(item.getGroups()));
    }

    private static RosterItem.AskType getAskStatus(org.xmpp.packet.Roster.Item item) {
        if (item.getAsk() == org.xmpp.packet.Roster.Ask.subscribe) {
            return RosterItem.ASK_SUBSCRIBE;
        }
        else if (item.getAsk() == org.xmpp.packet.Roster.Ask.unsubscribe) {
            return RosterItem.ASK_UNSUBSCRIBE;
        }
        else {
            return RosterItem.ASK_NONE;
        }
    }

    private static RosterItem.SubType getSubType(org.xmpp.packet.Roster.Item item) {
        if (item.getSubscription() == org.xmpp.packet.Roster.Subscription.to) {
            return RosterItem.SUB_TO;
        }
        else if (item.getSubscription() == org.xmpp.packet.Roster.Subscription.from) {
            return RosterItem.SUB_FROM;
        }
        else if (item.getSubscription() == org.xmpp.packet.Roster.Subscription.both) {
            return RosterItem.SUB_BOTH;
        }
        else if (item.getSubscription() == org.xmpp.packet.Roster.Subscription.remove) {
            return RosterItem.SUB_REMOVE;
        }
        else {
            return RosterItem.SUB_NONE;
        }
    }

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    /**
     * <p>Obtain the current subscription status of the item.</p>
     *
     * @return The subscription status of the item
     */
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    public SubType getSubStatus() {
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        return subStatus;
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    }
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    /**
     * <p>Set the current subscription status of the item.</p>
     *
     * @param subStatus The subscription status of the item
     */
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    public void setSubStatus(SubType subStatus) {
        this.subStatus = subStatus;
    }
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    /**
     * <p>Obtain the current ask status of the item.</p>
     *
     * @return The ask status of the item
     */
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    public AskType getAskStatus() {
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        if (isShared()) {
            // Redefine the ask status since the item belongs to a shared group
            return ASK_NONE;
        }
        else {
            return askStatus;
        }
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    }
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    /**
     * <p>Set the current ask status of the item.</p>
     *
     * @param askStatus The ask status of the item
     */
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    public void setAskStatus(AskType askStatus) {
        this.askStatus = askStatus;
    }
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    /**
     * <p>Obtain the current recv status of the item.</p>
     *
     * @return The recv status of the item
     */
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    public RecvType getRecvStatus() {
        return recvStatus;
    }
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    /**
     * <p>Set the current recv status of the item.</p>
     *
     * @param recvStatus The recv status of the item
     */
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    public void setRecvStatus(RecvType recvStatus) {
        this.recvStatus = recvStatus;
    }
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    /**
     * <p>Obtain the address of the item.</p>
     *
     * @return The address of the item
     */
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    public JID getJid() {
        return jid;
    }
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    /**
     * <p>Obtain the current nickname for the item.</p>
     *
     * @return The subscription status of the item
     */
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    public String getNickname() {
        return nickname;
    }
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    /**
     * <p>Set the current nickname for the item.</p>
     *
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     * @param nickname The subscription status of the item
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     */
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    public void setNickname(String nickname) {
        this.nickname = nickname;
    }
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    /**
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     * Returns the groups for the item. Shared groups won't be included in the answer.
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     *
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     * @return The groups for the item.
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     */
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    public List<String> getGroups() {
        return groups;
    }
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    /**
     * <p>Set the current groups for the item.</p>
     *
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     * @param groups The new lists of groups the item belongs to.
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     */
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    public void setGroups(List<String> groups) throws SharedGroupException {
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        if (groups == null) {
            this.groups = new LinkedList<String>();
        }
        else {
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            // Raise an error if the user is trying to remove the item from a shared group
            for (String groupName : getSharedGroups()) {
                // Check if the group has been removed from the new groups list
                if (!groups.contains(groupName)) {
                    throw new SharedGroupException("Cannot remove item from shared group");
                }
            }

            // Remove shared groups from the param
            for (Iterator<String> it=groups.iterator(); it.hasNext();) {
                try {
                    String group = it.next();
                    // Check if exists a shared group with this name
                    GroupManager.getInstance().getGroup(group);
                    // Remove the shared group from the list (since it exists)
                    it.remove();
                }
                catch (GroupNotFoundException e) {
                    // Do nothing since the group is a personal group
                }
            }
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            this.groups = groups;
        }
    }

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    /**
     * Returns the shared groups for the item.
     *
     * @return The shared groups this item belongs to.
     */
    public Collection<String> getSharedGroups() {
        return sharedGroups;
    }

    /**
     * Adds a new group to the shared groups list.
     *
     * @param sharedGroup The shared group to add to the list of shared groups.
     */
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    public void addSharedGroup(String sharedGroup) {
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        sharedGroups.add(sharedGroup);
    }

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    /**
     * Removes a group from the shared groups list.
     *
     * @param sharedGroup The shared group to remove from the list of shared groups.
     */
    public void removeSharedGroup(String sharedGroup) {
        sharedGroups.remove(sharedGroup);
    }

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    /**
     * Returns true if this item belongs to a shared group. Return true even if the item belongs
     * to a personal group and a shared group.
     *
     * @return true if this item belongs to a shared group.
     */
    public boolean isShared() {
        return !sharedGroups.isEmpty();
    }

    /**
     * Returns true if this item belongs ONLY to shared groups. This means that the the item is
     * considered to be "only shared" if it doesn't belong to a personal group but only to shared
     * groups.
     *
     * @return true if this item belongs ONLY to shared groups.
     */
    public boolean isOnlyShared() {
        return !sharedGroups.isEmpty() && groups.isEmpty();
    }

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    /**
     * <p>Obtain the roster ID associated with this particular roster item.</p>
     * <p/>
     * <p>Databases can use the roster ID as the key in locating roster items.</p>
     *
     * @return The roster ID
     */
    public long getID() {
        return rosterID;
    }

    public void setID(long rosterID) {
        this.rosterID = rosterID;
    }

    /**
     * <p>Update the cached item as a copy of the given item.</p>
     * <p/>
     * <p>A convenience for getting the item and setting each attribute.</p>
     *
     * @param item The item who's settings will be copied into the cached copy
     */
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    public void setAsCopyOf(org.xmpp.packet.Roster.Item item) throws SharedGroupException {
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        setGroups(new LinkedList<String>(item.getGroups()));
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        setNickname(item.getName());
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    }

    public int getCachedSize() {
        int size = jid.toBareJID().length();
        size += CacheSizes.sizeOfString(nickname);
        size += CacheSizes.sizeOfCollection(groups);
        size += CacheSizes.sizeOfInt(); // subStatus
        size += CacheSizes.sizeOfInt(); // askStatus
        size += CacheSizes.sizeOfLong(); // id
        return size;
    }
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}