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coerce.scala
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coerce.scala
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/*
* Copyright (c) 2002-2017 "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.compatibility.v3_3.runtime.commands
import org.neo4j.cypher.internal.compatibility.v3_3.runtime.helpers.{IsList, IsMap}
import org.neo4j.cypher.internal.frontend.v3_3.CypherTypeException
import org.neo4j.cypher.internal.frontend.v3_3.symbols._
import org.neo4j.cypher.internal.spi.v3_3.QueryContext
import org.neo4j.values._
import org.neo4j.values.storable._
import org.neo4j.values.virtual._
import scala.collection.JavaConverters._
object coerce {
def apply(value: AnyValue, typ: CypherType)(implicit context: QueryContext): AnyValue = {
val result = if (value == Values.NO_VALUE) Values.NO_VALUE else try {
typ match {
case CTAny => value
case CTString => value.asInstanceOf[TextValue]
case CTNode => value.asInstanceOf[NodeValue]
case CTRelationship => value.asInstanceOf[EdgeValue]
case CTPath => value.asInstanceOf[PathValue]
case CTInteger => Values.longValue(value.asInstanceOf[NumberValue].longValue())
case CTFloat => Values.doubleValue(value.asInstanceOf[NumberValue].doubleValue())
case CTMap => value match {
case IsMap(m) => m
case _ => throw cantCoerce(value, typ)
}
case t: ListType => value match {
case p: PathValue if t.innerType == CTNode => throw cantCoerce(value, typ)
case p: PathValue if t.innerType == CTRelationship => throw cantCoerce(value, typ)
case p: PathValue => p.asList
case IsList(coll) if t.innerType == CTAny => coll
case IsList(coll) => VirtualValues.list(coll.iterator().asScala.map(coerce(_, t.innerType)).toArray:_*)
case _ => throw cantCoerce(value, typ)
}
case CTBoolean => value.asInstanceOf[BooleanValue]
case CTNumber => value.asInstanceOf[NumberValue]
case CTPoint => value.asInstanceOf[PointValue]
case CTGeometry => value.asInstanceOf[PointValue]
case _ => throw cantCoerce(value, typ)
}
}
catch {
case e: ClassCastException => throw cantCoerce(value, typ, Some(e))
}
result
}
private def cantCoerce(value: Any, typ: CypherType, cause: Option[Throwable] = None) =
new CypherTypeException(s"Can't coerce `$value` to $typ", cause.orNull)
}