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Comparer.scala
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Comparer.scala
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.cypher.internal.compiler.v3_3
import org.neo4j.cypher.internal.compiler.v3_3.common.CypherOrderability
import org.neo4j.cypher.internal.compiler.v3_3.pipes.QueryState
import org.neo4j.cypher.internal.compiler.v3_3.spi.{NodeIdWrapper, RelationshipIdWrapper}
import org.neo4j.graphdb.{Node, Relationship}
import scala.collection.JavaConverters._
/**
* Comparer is a trait that enables it's subclasses to compare to AnyRef with each other.
*/
trait Comparer extends CypherSerializer {
import Comparer._
def compareForOrderability(operator: Option[String], l: Any, r: Any)(implicit qtx: QueryState): Int = {
CypherOrderability.compare(makeComparable(l), makeComparable(r))
}
private def makeComparable(a: Any): Any = a match {
case n: Node => new NodeIdWrapper {
override def id() = n.getId
}
case r: Relationship => new RelationshipIdWrapper {
override def id() = r.getId
}
case s: Seq[_] => s.map(makeComparable).asJava
case m: Map[_, _] => m.mapValues(makeComparable).asJava
case x => x
}
def compareForComparability(operator: Option[String], l: Any, r: Any)(implicit qtx: QueryState): Option[Int] = {
try {
if ((isString(l) && isString(r)) || (isNumber(l) && isNumber(r)) || (isBoolean(l) && isBoolean(r)))
Some(CypherOrdering.DEFAULT.compare(l, r))
else
None
} catch {
case _: IllegalArgumentException =>
None
}
}
}
object Comparer {
def isString(value: Any): Boolean = value match {
case _: String => true
case _: Character => true
case _ => value == null
}
def isNumber(value: Any): Boolean = value match {
case _: Number => true
case _ => value == null
}
def isBoolean(value: Any): Boolean = value match {
case _: Boolean => true
case _ => value == null
}
}