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ExplainExecutionResult.scala
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ExplainExecutionResult.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.compiler.v3_2
import java.io.PrintWriter
import java.util
import java.util.Collections
import org.neo4j.cypher.internal.compiler.v3_2.executionplan.{InternalExecutionResult, InternalQueryType}
import org.neo4j.cypher.internal.compiler.v3_2.planDescription.InternalPlanDescription
import org.neo4j.cypher.internal.compiler.v3_2.spi.InternalResultVisitor
import org.neo4j.cypher.internal.frontend.v3_2.notification.InternalNotification
import org.neo4j.graphdb.ResourceIterator
case class ExplainExecutionResult(columns: List[String],
executionPlanDescription: InternalPlanDescription,
executionType: InternalQueryType,
notifications: Set[InternalNotification])
extends InternalExecutionResult {
def javaIterator: ResourceIterator[util.Map[String, Any]] = new EmptyResourceIterator()
def columnAs[T](column: String) = Iterator.empty
def javaColumns: util.List[String] = Collections.emptyList()
def queryStatistics() = InternalQueryStatistics()
def dumpToString(writer: PrintWriter) {
writer.print(dumpToString)
}
val dumpToString: String =
"""+--------------------------------------------+
|| No data returned, and nothing was changed. |
|+--------------------------------------------+
|""".stripMargin
def javaColumnAs[T](column: String): ResourceIterator[T] = new EmptyResourceIterator()
def planDescriptionRequested = true
def close() {}
def next() = Iterator.empty.next()
def hasNext = false
override def accept[EX <: Exception](visitor: InternalResultVisitor[EX]) = {}
override def executionMode: ExecutionMode = ExplainMode
}
final class EmptyResourceIterator[T]() extends ResourceIterator[T] {
def close() {}
def next(): T= Iterator.empty.next()
def remove() {
throw new UnsupportedOperationException
}
def hasNext = false
}