server/extensions/xep0313-mam/src/main/java/org/apache/vysper/xmpp/modules/extension/xep0313_mam/in_memory/InMemoryMessageArchives.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.
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package org.apache.vysper.xmpp.modules.extension.xep0313_mam.in_memory;

import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

import org.apache.vysper.xmpp.addressing.Entity;
import org.apache.vysper.xmpp.modules.extension.xep0313_mam.spi.MessageArchives;
import org.apache.vysper.xmpp.modules.extension.xep0313_mam.spi.UserMessageArchive;

/**
 * @author Réda Housni Alaoui
 */
public class InMemoryMessageArchives implements MessageArchives {

    private final Map<Entity, UserMessageArchive> userMessageArchiveById = new HashMap<>();

    @Override
    public Optional<UserMessageArchive> retrieveUserMessageArchive(Entity userBareJid) {
        UserMessageArchive messageArchive = userMessageArchiveById.computeIfAbsent(userBareJid,
                id -> new InMemoryUserMessageArchive(userBareJid));
        return Optional.of(messageArchive);
    }
}