| /* |
| * 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.parquet.hadoop.example; |
| |
| import java.util.Map; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| import org.apache.parquet.example.data.Group; |
| import org.apache.parquet.example.data.simple.convert.GroupRecordConverter; |
| import org.apache.parquet.hadoop.api.ReadSupport; |
| import org.apache.parquet.io.api.RecordMaterializer; |
| import org.apache.parquet.schema.MessageType; |
| |
| public class GroupReadSupport extends ReadSupport<Group> { |
| |
| @Override |
| public org.apache.parquet.hadoop.api.ReadSupport.ReadContext init( |
| Configuration configuration, Map<String, String> keyValueMetaData, |
| MessageType fileSchema) { |
| String partialSchemaString = configuration.get(ReadSupport.PARQUET_READ_SCHEMA); |
| MessageType requestedProjection = getSchemaForRead(fileSchema, partialSchemaString); |
| return new ReadContext(requestedProjection); |
| } |
| |
| @Override |
| public RecordMaterializer<Group> prepareForRead(Configuration configuration, |
| Map<String, String> keyValueMetaData, MessageType fileSchema, |
| org.apache.parquet.hadoop.api.ReadSupport.ReadContext readContext) { |
| return new GroupRecordConverter(readContext.getRequestedSchema()); |
| } |
| |
| } |