| /* |
| * 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.extensions.sql.meta.provider.parquet; |
| |
| import com.google.auto.value.AutoValue; |
| import java.io.Serializable; |
| import org.apache.avro.generic.GenericRecord; |
| import org.apache.beam.sdk.schemas.Schema; |
| import org.apache.beam.sdk.schemas.utils.AvroUtils; |
| import org.apache.beam.sdk.transforms.DoFn; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.apache.beam.sdk.transforms.ParDo; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.sdk.values.Row; |
| |
| /** A {@link PTransform} to convert {@link GenericRecord} to {@link Row}. */ |
| @AutoValue |
| public abstract class GenericRecordReadConverter |
| extends PTransform<PCollection<GenericRecord>, PCollection<Row>> implements Serializable { |
| |
| public abstract Schema beamSchema(); |
| |
| public static Builder builder() { |
| return new AutoValue_GenericRecordReadConverter.Builder(); |
| } |
| |
| @Override |
| public PCollection<Row> expand(PCollection<GenericRecord> input) { |
| return input |
| .apply( |
| "GenericRecordsToRows", |
| ParDo.of( |
| new DoFn<GenericRecord, Row>() { |
| @ProcessElement |
| public void processElement(ProcessContext c) { |
| Row row = AvroUtils.toBeamRowStrict(c.element(), beamSchema()); |
| c.output(row); |
| } |
| })) |
| .setRowSchema(beamSchema()); |
| } |
| |
| @AutoValue.Builder |
| abstract static class Builder { |
| public abstract Builder beamSchema(Schema beamSchema); |
| |
| public abstract GenericRecordReadConverter build(); |
| } |
| } |