ai.h2o.sparkling.ml.params.NullableStringPairArrayParam.scala Maven / Gradle / Ivy
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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 ai.h2o.sparkling.ml.params
import org.apache.spark.ml.param.{Param, ParamPair, Params}
import org.json4s.JsonAST.{JArray, JInt}
import org.json4s.jackson.JsonMethods.{compact, parse, render}
import org.json4s.{JNull, JValue}
import water.AutoBuffer
import scala.collection.JavaConverters._
class NullableStringPairArrayParam(
parent: Params,
name: String,
doc: String,
isValid: Array[(String, String)] => Boolean)
extends Param[Array[(String, String)]](parent, name, doc, isValid) {
def this(parent: Params, name: String, doc: String) =
this(parent, name, doc, _ => true)
/** Creates a param pair with a `java.util.List` of values (for Java and Python). */
def w(value: java.util.List[Array[Object]]): ParamPair[Array[(String, String)]] = {
w(value.asScala.map(array => (array(0).toString, array(1).toString)).toArray)
}
override def jsonEncode(value: Array[(String, String)]): String = {
val encoded: JValue = if (value == null) {
JNull
} else {
val ab = new AutoBuffer()
ab.putASer(value.asInstanceOf[Array[AnyRef]])
val bytes = ab.buf()
JArray(bytes.toSeq.map(JInt(_)).toList)
}
compact(render(encoded))
}
override def jsonDecode(json: String): Array[(String, String)] = {
parse(json) match {
case JNull =>
null
case JArray(values) =>
val bytes: Array[Byte] = values.map {
case JInt(x) =>
x.byteValue
case _ =>
throw new IllegalArgumentException(s"Cannot decode $json to Byte.")
}.toArray
val ab = new AutoBuffer(bytes)
ab.getASer[(String, String)](classOf[(String, String)])
case _ =>
throw new IllegalArgumentException(s"Cannot decode $json to Array[(String, String)].")
}
}
}
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