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/*
* 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
}
}
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