mailbox/elasticsearch/src/main/java/org/apache/james/mailbox/elasticsearch/json/EMailers.java

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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
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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(" "));
    }
}