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iteratorToVisitable.scala
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iteratorToVisitable.scala
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/*
* Copyright (c) 2002-2016 "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_0.helpers
import org.neo4j.cypher.internal.compiler.v3_0.spi.{InternalResultRow, InternalResultVisitor}
import org.neo4j.cypher.internal.frontend.v3_0.helpers.Eagerly
import org.neo4j.graphdb.{Node, Path, Relationship}
import scala.collection.JavaConverters._
import scala.collection.Map
object iteratorToVisitable {
def accept[EX <: Exception](iterator: Iterator[Map[String, Any]], visitor: InternalResultVisitor[EX]) = {
val row = new MapResultRow()
var continue = true
while (continue && iterator.hasNext) {
row.map = iterator.next()
continue = visitor.visit(row)
}
}
private class MapResultRow extends InternalResultRow {
var map: Map[String, Any] = Map.empty
override def getNode(key: String): Node = getWithType(key, classOf[Node])
override def getRelationship(key: String): Relationship = getWithType(key, classOf[Relationship])
override def get(key: String): Object = getWithType(key, classOf[Object])
override def getNumber(key: String): Number = getWithType(key, classOf[Number])
override def getBoolean(key: String): java.lang.Boolean = getWithType(key, classOf[java.lang.Boolean])
override def getPath(key: String): Path = getWithType(key, classOf[Path])
override def getString(key: String): String = getWithType(key, classOf[String])
private def getWithType[T](key: String, clazz: Class[T]): T = {
map.get(key) match {
case None =>
throw new IllegalArgumentException("No column \"" + key + "\" exists")
case Some(value) if clazz.isInstance(value) || value == null =>
clazz.cast(javaValue(value))
case Some(value) =>
throw new NoSuchElementException("The current item in column \"" + key + "\" is not a " + clazz + ": \"" + value + "\"")
}
}
private def javaValue( value: Any ): Any = value match {
case iter: Seq[_] => iter.map( javaValue ).asJava
case iter: Map[_, _] => Eagerly.immutableMapValues( iter, javaValue ).asJava
case x => x
}
}
}