org.bdgenomics.utils.parquet.io.S3ByteAccess.scala Maven / Gradle / Ivy

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/**
 * Licensed to Big Data Genomics (BDG) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The BDG 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.bdgenomics.utils.parquet.io

import com.amazonaws.services.s3.AmazonS3
import com.amazonaws.services.s3.model.GetObjectRequest
import java.io.InputStream

class S3ByteAccess(client: AmazonS3, bucket: String, keyName: String) extends ByteAccess {
  assert(bucket != null)
  assert(keyName != null)

  lazy val objectMetadata = client.getObjectMetadata(bucket, keyName)
  override def length(): Long = objectMetadata.getContentLength
  override def readByteStream(offset: Long, length: Int): InputStream = {
    val getObjectRequest = new GetObjectRequest(bucket, keyName).withRange(offset, offset + length)
    client.getObject(getObjectRequest).getObjectContent
  }

}