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• 3.0.0-beta15
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• QueryOptimizer.scala

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com.foursquare.rogue.QueryOptimizer.scala Maven / Gradle / Ivy

// Copyright 2011 Foursquare Labs Inc. All Rights Reserved.
package com.foursquare.rogue

class QueryOptimizer {
  def isEmptyClause(clause: QueryClause[_]): Boolean = clause match {
    case AllQueryClause(_, vs) => vs.isEmpty
    case InQueryClause(_, vs) => vs.isEmpty
    case EmptyQueryClause(_) => true
    case _ => false
  }

  def isEmptyQuery(query: Query[_, _, _]): Boolean = {
    query.condition.clauses.exists(isEmptyClause)
  }

  def isEmptyQuery(query: ModifyQuery[_, _]): Boolean =
    isEmptyQuery(query.query)

  def isEmptyQuery(query: FindAndModifyQuery[_, _]): Boolean =
    isEmptyQuery(query.query)
}