measure/src/main/scala/org/apache/griffin/measure/step/builder/preproc/PreProcParamMaker.scala

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to you under the Apache License, Version 2.0 (the
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  http://www.apache.org/licenses/LICENSE-2.0

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package org.apache.griffin.measure.step.builder.preproc

import org.apache.griffin.measure.configuration.dqdefinition.RuleParam
import org.apache.griffin.measure.configuration.enums._

/**
  * generate each entity pre-proc params by template defined in pre-proc param
  */
object PreProcParamMaker {

  case class StringAnyMap ( values: Map[String, Any] )

  def makePreProcRules(rules: Seq[RuleParam],
                       suffix: String, dfName: String): (Seq[RuleParam], String) = {
    val len = rules.size
    val (newRules, _) = rules.zipWithIndex.foldLeft((Nil: Seq[RuleParam], dfName)) { (ret, pair) =>
      val (rls, prevOutDfName) = ret
      val (rule, i) = pair
      val inName = rule.getInDfName(prevOutDfName)
      val outName = if (i == len - 1) dfName else rule.getOutDfName(genNameWithIndex(dfName, i))
      val ruleWithNames = rule.replaceInOutDfName(inName, outName)
      (rls :+ makeNewPreProcRule(ruleWithNames, suffix), outName)
    }
    (newRules, withSuffix(dfName, suffix))
  }

  private def makeNewPreProcRule(rule: RuleParam, suffix: String): RuleParam = {
    val newInDfName = withSuffix(rule.getInDfName(), suffix)
    val newOutDfName = withSuffix(rule.getOutDfName(), suffix)
    val rpRule = rule.replaceInOutDfName(newInDfName, newOutDfName)
    rule.getDslType match {
      case DataFrameOpsType => rpRule
      case _ =>
        val newRule = replaceDfNameSuffix(rule.getRule, rule.getInDfName(), suffix)
        rpRule.replaceRule(newRule)
    }
  }

  private def genNameWithIndex(name: String, i: Int): String = s"${name}${i}"

  private def replaceDfNameSuffix(str: String, dfName: String, suffix: String): String = {
    val regexStr = s"(?i)${dfName}"
    val replaceDfName = withSuffix(dfName, suffix)
    str.replaceAll(regexStr, replaceDfName)
  }

  def withSuffix(str: String, suffix: String): String = s"${str}_${suffix}"

}