GroupWriteSupport.java

/**
 * Copyright 2012 Twitter, Inc.
 *
 * Licensed 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.
 *
 * This file is a modified version of GroupWriteSupport.java from original parquet source code
 *
 */


package net.iponweb.hadoop.streaming.parquet;

import org.apache.hadoop.conf.Configuration;
import org.apache.parquet.example.data.Group;
import org.apache.parquet.example.data.GroupWriter;
import org.apache.parquet.io.api.RecordConsumer;
import org.apache.parquet.schema.MessageType;
import org.apache.parquet.schema.MessageTypeParser;

import java.util.HashMap;

public class GroupWriteSupport extends org.apache.parquet.hadoop.api.WriteSupport<Group> {

  public static final String PARQUET_EXAMPLE_SCHEMA = "parquet.example.schema";

  public static void setSchema(MessageType schema, Configuration configuration) {
    configuration.set(PARQUET_EXAMPLE_SCHEMA, schema.toString());
  }

  public static MessageType getSchema(Configuration configuration) {
    return MessageTypeParser.parseMessageType(configuration.get(PARQUET_EXAMPLE_SCHEMA));
  }

  private MessageType schema;
  private GroupWriter groupWriter;

  @Override
  public org.apache.parquet.hadoop.api.WriteSupport.WriteContext init(Configuration configuration) {
    schema = getSchema(configuration);
    return new org.apache.parquet.hadoop.api.WriteSupport.WriteContext(schema, new HashMap<String, String>());
  }

  @Override
  public void prepareForWrite(RecordConsumer recordConsumer) {
    groupWriter = new GroupWriter(recordConsumer, schema);
  }

  @Override
  public void write(Group record) {
    groupWriter.write(record);
  }

}