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JavaConversionSupport.scala
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JavaConversionSupport.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.runtime.interpreted
import org.neo4j.collection.primitive.{PrimitiveIntIterator, PrimitiveLongIterator}
import org.neo4j.cypher.internal.util.v3_4.EntityNotFoundException
import org.neo4j.internal.kernel.api.exceptions
object JavaConversionSupport {
def asScala(iterator: PrimitiveIntIterator): Iterator[Int] = new Iterator[Int] {
def hasNext = iterator.hasNext
def next() = iterator.next()
}
def asScalaENFXSafe(iterator: PrimitiveIntIterator): Iterator[Int] = makeENFXSafe(iterator.hasNext, iterator.next)(identity)
// Same as mapToScala, but handles concurrency exceptions by swallowing exceptions
def mapToScalaENFXSafe[T](iterator: PrimitiveLongIterator)(f: Long => T): Iterator[T] = makeENFXSafe(iterator.hasNext, iterator.next)(f)
private def makeENFXSafe[S,T](hasMore: () => Boolean, more: () => S)(f: S => T): Iterator[T] = new Iterator[T] {
private var _next: Option[T] = fetchNext()
// Init
private def fetchNext(): Option[T] = {
_next = None
while (_next.isEmpty && hasMore()) {
try {
_next = Some(f(more()))
} catch {
case _: exceptions.EntityNotFoundException => // IGNORE
case _: EntityNotFoundException => // IGNORE
}
}
_next
}
def hasNext = _next.nonEmpty
def next() = {
val r = _next.getOrElse(throw new NoSuchElementException("next on empty result"))
fetchNext()
r
}
}
}