org.neo4j.cypher.internal.util.AnonymousVariableNameGenerator.scala Maven / Gradle / Ivy
/*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [http://neo4j.com]
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.neo4j.cypher.internal.util
import org.neo4j.cypher.internal.util.AnonymousVariableNameGenerator.prefix
import org.neo4j.cypher.internal.util.helpers.NameDeduplicator.nameGeneratorRegex
class AnonymousVariableNameGenerator() {
private var counter = 0
def nextName: String = {
val result = s"$prefix$counter"
counter += 1
result
}
}
object AnonymousVariableNameGenerator {
val generatorName = "UNNAMED"
private val prefix = s" $generatorName"
def isNamed(x: String): Boolean = !notNamed(x)
def notNamed(x: String): Boolean = x.startsWith(prefix)
def unapply(v: Any): Option[String] = v match {
case str: String =>
val regex = nameGeneratorRegex(generatorName)
regex.findPrefixMatchOf(str).map(_ group 2)
case _ => None
}
}