org.neo4j.cypher.internal.expressions.MatchMode.scala Maven / Gradle / Ivy
/*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [https://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.expressions
import org.neo4j.cypher.internal.util.ASTNode
import org.neo4j.cypher.internal.util.InputPosition
object MatchMode {
sealed trait MatchMode extends ASTNode {
def prettified: String
def requiresDifferentRelationships: Boolean
}
def default(position: InputPosition): MatchMode = {
DifferentRelationships(implicitlyCreated = true)(position)
}
case class RepeatableElements()(val position: InputPosition) extends MatchMode {
override def prettified: String = "REPEATABLE ELEMENTS"
override def requiresDifferentRelationships: Boolean = false
}
/**
* @param implicitlyCreated TODO This is tracked so that we in semantic analysis know if someone explicitly wrote
* "DIFFERENT RELATIONSHIPS" or if we added that implicitly. Adding it explicitly should
* for now fail, unless the semantic feature
* {@link org.neo4j.cypher.internal.ast.semantics.SemanticFeature.MatchModes} has been
* explicitly turned on.
*
* TODO This can be removed once "MatchModes" is enabled by default.
*/
case class DifferentRelationships(implicitlyCreated: Boolean = false)(val position: InputPosition) extends MatchMode {
override def prettified: String = if (implicitlyCreated) "" else "DIFFERENT RELATIONSHIPS"
override def requiresDifferentRelationships: Boolean = true
}
}