org.neo4j.cypher.internal.expressions.PathExpression.scala Maven / Gradle / Ivy

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Cypher expressions

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/*
 * 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.expressions

import org.neo4j.cypher.internal.util.InputPosition

sealed trait PathStep extends Expression {
  def dependencies: Set[LogicalVariable]
}

final case class NodePathStep(node: LogicalVariable, next: PathStep)(val position: InputPosition) extends PathStep {
  override val dependencies: Set[LogicalVariable] = next.dependencies + node
}

final case class SingleRelationshipPathStep(rel: LogicalVariable, direction: SemanticDirection, toNode: Option[LogicalVariable], next: PathStep)(val position: InputPosition) extends PathStep {
  override val dependencies: Set[LogicalVariable] = next.dependencies ++ toNode + rel
}

final case class MultiRelationshipPathStep(rel: LogicalVariable, direction: SemanticDirection, toNode: Option[LogicalVariable], next: PathStep)(val position: InputPosition) extends PathStep {
  override val dependencies: Set[LogicalVariable] = next.dependencies ++ toNode + rel
}

case class NilPathStep()(val position: InputPosition) extends PathStep {
  override def dependencies = Set.empty[LogicalVariable]
}

case class PathExpression(step: PathStep)(val position: InputPosition) extends Expression