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There is a newer version: 6.0.2

/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.grn.providers;

import org.graylog.grn.GRN;
import org.graylog.grn.GRNDescriptor;
import org.graylog.grn.GRNDescriptorProvider;
import org.graylog2.shared.users.UserService;

import javax.inject.Inject;
import java.util.Optional;

public class UserGRNDescriptorProvider implements GRNDescriptorProvider {
    private final UserService userService;

    @Inject
    public UserGRNDescriptorProvider(UserService userService) {
        this.userService = userService;
    }

    @Override
    public GRNDescriptor get(GRN grn) {
        return Optional.ofNullable(userService.loadById(grn.entity()))
                .map(user -> GRNDescriptor.create(grn, user.getFullName()))
                .orElse(GRNDescriptor.create(grn, "ERROR: User for <" + grn.toString() + "> not found!"));
    }
}