server/extensions/xep0313-mam/src/main/java/org/apache/vysper/xmpp/modules/extension/xep0313_mam/user/UserInfoRequestListener.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.apache.vysper.xmpp.modules.extension.xep0313_mam.user;

import static java.util.Objects.requireNonNull;

import java.util.Collections;
import java.util.List;

import org.apache.vysper.xmpp.addressing.Entity;
import org.apache.vysper.xmpp.modules.extension.xep0313_mam.spi.MessageArchives;
import org.apache.vysper.xmpp.modules.servicediscovery.management.Feature;
import org.apache.vysper.xmpp.modules.servicediscovery.management.InfoElement;
import org.apache.vysper.xmpp.modules.servicediscovery.management.InfoRequest;
import org.apache.vysper.xmpp.modules.servicediscovery.management.InfoRequestListener;

/**
 * @author Réda Housni Alaoui
 */
public class UserInfoRequestListener implements InfoRequestListener {

    private final MessageArchives messageArchives;

    private final String namespace;

    public UserInfoRequestListener(MessageArchives messageArchives, String namespace) {
        this.messageArchives = requireNonNull(messageArchives);
        this.namespace = requireNonNull(namespace);
    }

    @Override
    public List<InfoElement> getInfosFor(InfoRequest request) {
        Entity archiveId = request.getTo().getBareJID();
        if (!messageArchives.retrieveUserMessageArchive(archiveId).isPresent()) {
            return Collections.emptyList();
        }
        return Collections.singletonList(new Feature(namespace));
    }
}