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Updates.scala
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Updates.scala
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/**
* Copyright (c) 2002-2012 "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.parser.v1_8
import org.neo4j.cypher.internal.mutation._
import org.neo4j.cypher.internal.commands._
import org.neo4j.cypher.SyntaxException
trait Updates extends Base with Expressions with StartClause {
def updates: Parser[(Seq[UpdateAction], Seq[NamedPath])] = rep(delete | set | foreach) ^^ (cmds => reduce(cmds))
def foreach: Parser[(Seq[UpdateAction], Seq[NamedPath])] = ignoreCase("foreach") ~> "(" ~> identity ~ ignoreCase("in") ~ expression ~ ":" ~ opt(createStart) ~ opt(updates) <~ ")" ^^ {
case id ~ in ~ collection ~ ":" ~ creates ~ innerUpdates => {
val createCmds = creates.toSeq.map(_._1.map(_.asInstanceOf[UpdateAction])).flatten
val reducedItems: (Seq[UpdateAction], Seq[NamedPath]) = reduce(innerUpdates.toSeq)
val updateCmds = reducedItems._1
val namedPaths = reducedItems._2 ++ creates.toSeq.flatMap(_._2)
if(namedPaths.nonEmpty) throw new SyntaxException("Paths can't be created inside of foreach")
(Seq(ForeachAction(collection, id, createCmds ++ updateCmds)), Seq())
}
}
def delete: Parser[(Seq[UpdateAction], Seq[NamedPath])] = ignoreCase("delete") ~> commaList(expression) ^^ {
case expressions => val updateActions: List[UpdateAction with Product] = expressions.map {
case Property(entity, property) => DeletePropertyAction(Entity(entity), property)
case x => DeleteEntityAction(x)
}
(updateActions, Seq())
}
def set: Parser[(Seq[UpdateAction], Seq[NamedPath])] = ignoreCase("set") ~> commaList(propertySet) ^^ ((_,Seq()))
def propertySet = property ~ "=" ~ expression ^^ {
case p ~ "=" ~ e => PropertySetAction(p.asInstanceOf[Property], e)
}
}