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Apache Hadoop Common

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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.hadoop.fs;

import java.util.Collections;
import java.util.Iterator;

/**
 * EmptyStorageStatistics is a StorageStatistics implementation which has no
 * data.
 */
class EmptyStorageStatistics extends StorageStatistics {
  EmptyStorageStatistics(String name) {
    super(name);
  }

  @Override
  public Iterator getLongStatistics() {
    return Collections.emptyIterator();
  }

  @Override
  public Long getLong(String key) {
    return null;
  }

  @Override
  public boolean isTracked(String key) {
    return false;
  }

  @Override
  public void reset() {
  }
}