org.opencypher.v9_0.expressions.ConstantExpression.scala Maven / Gradle / Ivy

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Cypher expressions

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/*
 * Copyright (c) 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.opencypher.v9_0.expressions

object ConstantExpression {
  def unapply(v: AnyRef): Option[Expression] = v match {
    case expr: Literal => Some(expr)
    case expr: Parameter => Some(expr)
    case expr@ListLiteral(expressions) if expressions.forall(unapply(_).nonEmpty) => Some(expr)
    case _ => None
  }
}