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/**
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smack;

import java.util.Collection;

import org.xmpp.packet.Roster;

/**
 * This is an interface for persistent roster store needed to implement roster
 * versioning as per RFC 6121.
 */

public interface RosterStore {

    /**
     * This method returns a collection of all roster items contained in this
     * store.
     * 
     * @return List of {@link RosterEntry}
     */
    public Collection getEntries();

    /**
     * This method returns the roster item in this store for the given JID.
     * 
     * @param bareJid
     *            The bare JID of the RosterEntry
     * @return The {@link RosterEntry} which belongs to that user
     */
    public Roster.Item getEntry(String bareJid);

    /**
     * This method returns the version number as specified by the "ver"
     * attribute of the local store. For a fresh store, this MUST be the empty
     * string.
     * 
     * @return local roster version
     */
    public String getRosterVersion();

    /**
     * This method stores a new roster entry in this store or updates an
     * existing one.
     * 
     * @param item
     *            the entry to store
     * @param version
     *            the new roster version
     * @return True if successful
     */
    public boolean addEntry(Roster.Item item, String version);

    /**
     * This method updates the store so that it contains only the given entries.
     * 
     * @param items
     *            the entries to store
     * @param version
     *            the new roster version
     * @return True if successful
     */
    public boolean resetEntries(Collection items, String version);

    /**
     * Removes an entry from the store
     * 
     * @param bareJid
     *            The bare JID of the entry to be removed
     * @param version
     *            the new roster version
     * @return True if successful
     */
    public boolean removeEntry(String bareJid, String version);

}