gobblin-utility/src/main/java/org/apache/gobblin/broker/EmptyKey.java

/*
 * 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.gobblin.broker;

import org.apache.gobblin.broker.iface.SharedResourceKey;

import lombok.EqualsAndHashCode;


/**
 * A dummy {@link SharedResourceKey}.
 */
@EqualsAndHashCode
public final class EmptyKey implements SharedResourceKey {
  /** A singleton instance */
  public static final EmptyKey INSTANCE = new EmptyKey();

  @Override
  public String toConfigurationKey() {
    return null;
  }
}