com.twitter.scalding.commons.source.LzoCodecSource.scala Maven / Gradle / Ivy

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/*
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.
*/

package com.twitter.scalding.commons.source

import com.twitter.chill.Externalizer
import com.twitter.scalding._
import com.twitter.bijection.Injection

/**
 * Source used to write some type T into an LZO-compressed SequenceFile using a
 * codec on T for serialization.
 */

object LzoCodecSource {
  def apply[T](paths: String*)(implicit passedInjection: Injection[T, Array[Byte]]) =
    new LzoCodec[T] {
      val hdfsPaths = paths
      val localPath = { assert(paths.size == 1, "Cannot use multiple input files on local mode"); paths(0) }
      val boxed = Externalizer(passedInjection)
      override def injection = boxed.get
    }
}