/*
 * 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.read.query.timegenerator;

import java.io.IOException;
import org.apache.iotdb.tsfile.read.common.Path;

/**
 * All SingleSeriesExpression involved in a IExpression will be transferred to a TimeGenerator tree
 * whose leaf nodes are all SeriesReaders, The TimeGenerator tree can generate the next timestamp
 * that satisfies the filter condition. Then we use this timestamp to get values in other series
 * that are not included in IExpression
 */
public interface TimeGenerator {

  boolean hasNext() throws IOException;

  long next() throws IOException;

  Object getValue(Path path, long time) throws IOException;

}
