/*
* 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;
import org.apache.beam.sdk.annotations.Experimental;
import org.apache.beam.sdk.annotations.Experimental.Kind;
import org.apache.beam.sdk.annotations.Internal;
import org.apache.beam.sdk.util.WindowedValue;
/**
* <b><i>For internal use only; no backwards-compatibility guarantees.</i></b>
*
* <p>Utility methods for constructing known {@link Materialization materializations} for a
* {@link ViewFn}.
*/
@Internal
public class Materializations {
/**
* The URN for a {@link Materialization} where the primitive view type is an iterable of fully
* specified windowed values.
*/
@Experimental(Kind.CORE_RUNNERS_ONLY)
public static final String ITERABLE_MATERIALIZATION_URN =
"urn:beam:sideinput:materialization:iterable:0.1";
/**
* <b><i>For internal use only; no backwards-compatibility guarantees.</i></b>
*
* <p>A {@link Materialization} where the primitive view type is an iterable of fully specified
* windowed values.
*/
@Internal
public static <T> Materialization<Iterable<WindowedValue<T>>> iterable() {
return new IterableMaterialization<>();
}
private static class IterableMaterialization<T>
implements Materialization<Iterable<WindowedValue<T>>> {
@Override
public String getUrn() {
return ITERABLE_MATERIALIZATION_URN;
}
}
}