/*
* 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.beam.sdk.transforms.windowing;
/**
* Abstract base class for {@link WindowFn WindowFns} that do not merge windows.
*
* @param <T> type of elements being windowed
* @param <W> {@link BoundedWindow} subclass used to represent the windows used by this
* {@code WindowFn}
*/
public abstract class NonMergingWindowFn<T, W extends BoundedWindow>
extends WindowFn<T, W> {
@Override
public final void mergeWindows(MergeContext c) { }
@Override
public final boolean isNonMerging() {
return true;
}
}