parquet-protobuf/src/main/java/parquet/proto/ProtoParquetWriter.java

/**
 * Copyright 2013 Lukas Nalezenec
 *
 * 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.
 */
package parquet.proto;

import com.google.protobuf.Message;
import com.google.protobuf.MessageOrBuilder;
import org.apache.hadoop.fs.Path;
import parquet.hadoop.ParquetWriter;
import parquet.hadoop.api.WriteSupport;
import parquet.hadoop.metadata.CompressionCodecName;

import java.io.IOException;

/**
 * Write Protobuf records to a Parquet file.
 */
public class ProtoParquetWriter<T extends MessageOrBuilder> extends ParquetWriter<T> {

  /**
   * Create a new {@link ProtoParquetWriter}.
   *
   * @param file
   * @param compressionCodecName
   * @param blockSize
   * @param pageSize
   * @throws IOException
   */
  public ProtoParquetWriter(Path file, Class<? extends Message> protoMessage,
                            CompressionCodecName compressionCodecName, int blockSize,
                            int pageSize) throws IOException {
    super(file, new ProtoWriteSupport(protoMessage),
            compressionCodecName, blockSize, pageSize);
  }

  /**
   * Create a new {@link ProtoParquetWriter}.
   *
   * @param file                 The file name to write to.
   * @param compressionCodecName Compression code to use, or CompressionCodecName.UNCOMPRESSED
   * @param blockSize            HDFS block size
   * @param pageSize             See parquet write up. Blocks are subdivided into pages for alignment and other purposes.
   * @param enableDictionary     Whether to use a dictionary to compress columns.
   * @param validating           to turn on validation using the schema
   * @throws IOException
   */
  public ProtoParquetWriter(Path file, Class<? extends Message> protoMessage,
                            CompressionCodecName compressionCodecName, int blockSize,
                            int pageSize, boolean enableDictionary, boolean validating) throws IOException {
    super(file, new ProtoWriteSupport(protoMessage),
            compressionCodecName, blockSize, pageSize, enableDictionary, validating);
  }

  /**
   * Create a new {@link ProtoParquetWriter}. The default block size is 50 MB.The default
   * page size is 1 MB.  Default compression is no compression. (Inherited from {@link ParquetWriter})
   *
   * @param file The file name to write to.
   * @throws IOException
   */
  public ProtoParquetWriter(Path file, Class<? extends Message> protoMessage) throws IOException {
    this(file, protoMessage, CompressionCodecName.UNCOMPRESSED,
            DEFAULT_BLOCK_SIZE, DEFAULT_PAGE_SIZE);
  }

}