/*
* 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.runners.dataflow;
import org.apache.beam.sdk.transforms.PTransform;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.PCollectionView;
/** A {@link DataflowRunner} marker class for creating a {@link PCollectionView}. */
public class CreateDataflowView<ElemT, ViewT>
extends PTransform<PCollection<ElemT>, PCollectionView<ViewT>> {
public static <ElemT, ViewT> CreateDataflowView<ElemT, ViewT> of(PCollectionView<ViewT> view) {
return new CreateDataflowView<>(view);
}
private final PCollectionView<ViewT> view;
private CreateDataflowView(PCollectionView<ViewT> view) {
this.view = view;
}
@Override
public PCollectionView<ViewT> expand(PCollection<ElemT> input) {
return view;
}
public PCollectionView<ViewT> getView() {
return view;
}
}