org.apache.twill.api.Hosts.java Source code

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Here is the source code for org.apache.twill.api.Hosts.java

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/*
 * 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.twill.api;

import com.google.common.collect.ImmutableSet;

import java.util.Arrays;
import java.util.Set;

/**
 * Represents a list of hosts.
 */

public class Hosts {
    private final Set<String> hosts;

    public Hosts(Set<String> hosts) {
        this.hosts = ImmutableSet.copyOf(hosts);
    }

    public Hosts(String host, String... moreHosts) {
        this.hosts = ImmutableSet.<String>builder().add(host).addAll(Arrays.asList(moreHosts)).build();
    }

    /**
     * Convenience method to create an instance of {@link org.apache.twill.api.Hosts}.
     * @param host A host to be added.
     * @param moreHosts A list of hosts to be added.
     * @return An instance of {@link org.apache.twill.api.Hosts} containing specified hosts.
     */
    public static Hosts of(String host, String... moreHosts) {
        return new Hosts(host, moreHosts);
    }

    /**
     * Get the list of hosts.
     * @return list of hosts.
     */
    public Set<String> get() {
        return this.hosts;
    }

    @Override
    public String toString() {
        return this.hosts.toString();
    }
}