| /* |
| * 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.hudi.client.bootstrap; |
| |
| import org.apache.hudi.avro.HoodieAvroUtils; |
| import org.apache.hudi.avro.model.HoodieFileStatus; |
| import org.apache.hudi.client.common.HoodieEngineContext; |
| import org.apache.hudi.common.util.collection.Pair; |
| import org.apache.hudi.config.HoodieWriteConfig; |
| |
| import org.apache.avro.Schema; |
| |
| import java.util.List; |
| |
| /** |
| * Bootstrap Schema Provider. Schema provided in config is used. If not available, use schema from Parquet |
| */ |
| public abstract class HoodieBootstrapSchemaProvider { |
| |
| protected final HoodieWriteConfig writeConfig; |
| |
| public HoodieBootstrapSchemaProvider(HoodieWriteConfig writeConfig) { |
| this.writeConfig = writeConfig; |
| } |
| |
| /** |
| * Main API to select avro schema for bootstrapping. |
| * @param context HoodieEngineContext |
| * @param partitions List of partitions with files within them |
| * @return Avro Schema |
| */ |
| public final Schema getBootstrapSchema(HoodieEngineContext context, List<Pair<String, List<HoodieFileStatus>>> partitions) { |
| if (writeConfig.getSchema() != null) { |
| // Use schema specified by user if set |
| Schema userSchema = Schema.parse(writeConfig.getSchema()); |
| if (!HoodieAvroUtils.getNullSchema().equals(userSchema)) { |
| return userSchema; |
| } |
| } |
| return getBootstrapSourceSchema(context, partitions); |
| } |
| |
| /** |
| * Select a random file to be used to generate avro schema. |
| * Override this method to get custom schema selection. |
| * @param context HoodieEngineContext |
| * @param partitions List of partitions with files within them |
| * @return Avro Schema |
| */ |
| protected abstract Schema getBootstrapSourceSchema(HoodieEngineContext context, |
| List<Pair<String, List<HoodieFileStatus>>> partitions); |
| |
| } |