| /* |
| * 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.in_memory; |
| |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.concurrent.atomic.AtomicLong; |
| import java.util.stream.Collectors; |
| |
| import org.apache.vysper.xmpp.modules.extension.xep0313_mam.spi.ArchivedMessage; |
| import org.apache.vysper.xmpp.modules.extension.xep0313_mam.spi.ArchivedMessages; |
| import org.apache.vysper.xmpp.modules.extension.xep0313_mam.spi.MessagePageRequest; |
| |
| /** |
| * @author RĂ©da Housni Alaoui |
| */ |
| public class InMemoryArchivedMessagesPage implements ArchivedMessages { |
| |
| private final List<ArchivedMessage> list; |
| |
| private final Long firstMessageIndex; |
| |
| private final long totalNumberOfMessages; |
| |
| public InMemoryArchivedMessagesPage(MessagePageRequest request, List<ArchivedMessage> unlimitedMessages) { |
| totalNumberOfMessages = unlimitedMessages.size(); |
| |
| String firstMessageId = request.firstMessageId().orElse(null); |
| String lastMessageId = request.lastMessageId().orElse(null); |
| Long pageSize = request.pageSize().orElse(null); |
| |
| AtomicBoolean firstMessageFound = new AtomicBoolean(firstMessageId == null); |
| AtomicBoolean lastMessageFound = new AtomicBoolean(); |
| AtomicLong numberOfMessageKept = new AtomicLong(); |
| |
| list = unlimitedMessages.stream().filter(message -> pageSize == null || numberOfMessageKept.get() < pageSize) |
| .peek(message -> lastMessageFound.compareAndSet(false, |
| lastMessageId != null && lastMessageId.equals(message.id()))) |
| .filter(message -> !lastMessageFound.get()) |
| .peek(message -> firstMessageFound.compareAndSet(false, message.id().equals(firstMessageId))) |
| .filter(message -> firstMessageFound.get() && !message.id().equals(firstMessageId)) |
| .peek(message -> numberOfMessageKept.incrementAndGet()).collect(Collectors.toList()); |
| |
| firstMessageIndex = list.stream().findFirst().map(unlimitedMessages::indexOf).map(index -> (long) index) |
| .orElse(null); |
| } |
| |
| @Override |
| public List<ArchivedMessage> list() { |
| return list; |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return list.isEmpty(); |
| } |
| |
| @Override |
| public boolean isComplete() { |
| return list.size() == totalNumberOfMessages; |
| } |
| |
| @Override |
| public Optional<Long> firstMessageIndex() { |
| return Optional.ofNullable(firstMessageIndex); |
| } |
| |
| @Override |
| public Optional<Long> totalNumberOfMessages() { |
| return Optional.of(totalNumberOfMessages); |
| } |
| } |