org.apache.spark.examples.pythonconverters.CassandraConverters.scala Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of snappy-spark-examples_2.10 Show documentation

SnappyData distributed data store and execution engine

There is a newer version: 1.6.2-6

Show newest version

/*
 * 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.spark.examples.pythonconverters

import java.nio.ByteBuffer

import scala.collection.JavaConverters._

import org.apache.cassandra.utils.ByteBufferUtil

import org.apache.spark.api.python.Converter

/**
 * Implementation of [[org.apache.spark.api.python.Converter]] that converts Cassandra
 * output to a Map[String, Int]
 */
class CassandraCQLKeyConverter extends Converter[Any, java.util.Map[String, Int]] {
  override def convert(obj: Any): java.util.Map[String, Int] = {
    val result = obj.asInstanceOf[java.util.Map[String, ByteBuffer]]
    result.asScala.mapValues(ByteBufferUtil.toInt).asJava
  }
}

/**
 * Implementation of [[org.apache.spark.api.python.Converter]] that converts Cassandra
 * output to a Map[String, String]
 */
class CassandraCQLValueConverter extends Converter[Any, java.util.Map[String, String]] {
  override def convert(obj: Any): java.util.Map[String, String] = {
    val result = obj.asInstanceOf[java.util.Map[String, ByteBuffer]]
    result.asScala.mapValues(ByteBufferUtil.string).asJava
  }
}

/**
 * Implementation of [[org.apache.spark.api.python.Converter]] that converts a
 * Map[String, Int] to Cassandra key
 */
class ToCassandraCQLKeyConverter extends Converter[Any, java.util.Map[String, ByteBuffer]] {
  override def convert(obj: Any): java.util.Map[String, ByteBuffer] = {
    val input = obj.asInstanceOf[java.util.Map[String, Int]]
    input.asScala.mapValues(ByteBufferUtil.bytes).asJava
  }
}

/**
 * Implementation of [[org.apache.spark.api.python.Converter]] that converts a
 * List[String] to Cassandra value
 */
class ToCassandraCQLValueConverter extends Converter[Any, java.util.List[ByteBuffer]] {
  override def convert(obj: Any): java.util.List[ByteBuffer] = {
    val input = obj.asInstanceOf[java.util.List[String]]
    input.asScala.map(ByteBufferUtil.bytes).asJava
  }
}