Java tutorial
/**************************************************************** * 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.james.mailrepository.memory; import java.util.Set; import java.util.stream.Stream; import org.apache.james.mailrepository.api.MailRepositoryUrl; import org.apache.james.mailrepository.api.MailRepositoryUrlStore; import com.google.common.collect.Sets; public class MemoryMailRepositoryUrlStore implements MailRepositoryUrlStore { private final Set<MailRepositoryUrl> urls; public MemoryMailRepositoryUrlStore() { urls = Sets.newConcurrentHashSet(); } @Override public void add(MailRepositoryUrl url) { urls.add(url); } @Override public Stream<MailRepositoryUrl> listDistinct() { return urls.stream(); } @Override public boolean contains(MailRepositoryUrl url) { return urls.contains(url); } }