| /* |
| * 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.spark.structuredstreaming.translation.helpers; |
| |
| import static org.apache.spark.sql.types.DataTypes.BinaryType; |
| |
| import org.apache.beam.sdk.coders.Coder; |
| import org.apache.spark.sql.Encoder; |
| import org.apache.spark.sql.catalyst.analysis.GetColumnByOrdinal; |
| import org.apache.spark.sql.catalyst.encoders.ExpressionEncoder; |
| import org.apache.spark.sql.catalyst.expressions.BoundReference; |
| import org.apache.spark.sql.catalyst.expressions.Cast; |
| import org.apache.spark.sql.catalyst.expressions.Expression; |
| import org.apache.spark.sql.types.ObjectType; |
| import scala.reflect.ClassTag; |
| import scala.reflect.ClassTag$; |
| |
| public class EncoderFactory { |
| |
| public static <T> Encoder<T> fromBeamCoder(Coder<T> coder) { |
| Class<? super T> clazz = coder.getEncodedTypeDescriptor().getRawType(); |
| ClassTag<T> classTag = ClassTag$.MODULE$.apply(clazz); |
| Expression serializer = |
| new EncoderHelpers.EncodeUsingBeamCoder<>( |
| new BoundReference(0, new ObjectType(clazz), true), coder); |
| Expression deserializer = |
| new EncoderHelpers.DecodeUsingBeamCoder<>( |
| new Cast( |
| new GetColumnByOrdinal(0, BinaryType), BinaryType, scala.Option.<String>empty()), |
| classTag, |
| coder); |
| return new ExpressionEncoder<>(serializer, deserializer, classTag); |
| } |
| } |