spark AbstractParams 源码
spark AbstractParams 代码
文件路径：/examples/src/main/scala/org/apache/spark/examples/mllib/AbstractParams.scala
/*
* 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.mllib
import scala.reflect.runtime.universe._
/**
* Abstract class for parameter case classes.
* This overrides the [[toString]] method to print all case class fields by name and value.
* @tparam T Concrete parameter class.
*/
abstract class AbstractParams[T: TypeTag] {
private def tag: TypeTag[T] = typeTag[T]
/**
* Finds all case class fields in concrete class instance, and outputs them in JSON-style format:
* {
* [field name]:\t[field value]\n
* [field name]:\t[field value]\n
* ...
* }
*/
override def toString: String = {
val tpe = tag.tpe
val allAccessors = tpe.decls.collect {
case m: MethodSymbol if m.isCaseAccessor => m
}
val mirror = runtimeMirror(getClass.getClassLoader)
val instanceMirror = mirror.reflect(this)
allAccessors.map { f =>
val paramName = f.name.toString
val fieldMirror = instanceMirror.reflectField(f)
val paramValue = fieldMirror.get
s" $paramName:\t$paramValue"
}.mkString("{\n", ",\n", "\n}")
}
}
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