iotdb-core/tsfile/src/main/java/org/apache/iotdb/tsfile/file/metadata/IMetadata.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.iotdb.tsfile.file.metadata;

import org.apache.iotdb.tsfile.file.metadata.statistics.Statistics;

import java.io.Serializable;
import java.util.Optional;

public interface IMetadata {

  Statistics<? extends Serializable> getStatistics();

  Statistics<? extends Serializable> getTimeStatistics();

  Optional<Statistics<? extends Serializable>> getMeasurementStatistics(int measurementIndex);

  boolean hasNullValue(int measurementIndex);

  default boolean timeAllSelected() {
    return true;
  }

  default int getMeasurementCount() {
    return 1;
  }
}