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.mailbox.elasticsearch.json; import java.util.Set; import java.util.stream.Collectors; import com.fasterxml.jackson.annotation.JsonValue; import com.google.common.base.Preconditions; public class EMailers implements Serializable { public static EMailers from(Set<EMailer> emailers) { Preconditions.checkNotNull(emailers, "'emailers' is mandatory"); return new EMailers(emailers); } private final Set<EMailer> emailers; private EMailers(Set<EMailer> emailers) { this.emailers = emailers; } @JsonValue public Set<EMailer> getEmailers() { return emailers; } @Override public String serialize() { return emailers.stream().map(EMailer::serialize).collect(Collectors.joining(" ")); } }