/*
* 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.flink.streaming.api.windowing.windows;
import org.apache.flink.annotation.PublicEvolving;
/**
* A {@code Window} is a grouping of elements into finite buckets. Windows have a maximum timestamp
* which means that, at some point, all elements that go into one window will have arrived.
*
* <p>Subclasses should implement {@code equals()} and {@code hashCode()} so that logically
* same windows are treated the same.
*/
@PublicEvolving
public abstract class Window {
/**
* Gets the largest timestamp that still belongs to this window.
*
* @return The largest timestamp that still belongs to this window.
*/
public abstract long maxTimestamp();
}