org.ekrich.config.impl.ConfigNull.scala Maven / Gradle / Ivy

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Configuration library for Scala using HOCON files

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/**
 *   Copyright (C) 2011-2012 Typesafe Inc. 
 */
package org.ekrich.config.impl

import java.{lang => jl}
import java.io.ObjectStreamException
import java.io.Serializable
import org.ekrich.config.ConfigOrigin
import org.ekrich.config.ConfigRenderOptions
import org.ekrich.config.ConfigValueType

/**
 * This exists because sometimes null is not the same as missing. Specifically,
 * if a value is set to null we can give a better error message (indicating
 * where it was set to null) in case someone asks for the value. Also, null
 * overrides values set "earlier" in the search path, while missing values do
 * not.
 *
 */
@SerialVersionUID(2L)
final class ConfigNull(origin: ConfigOrigin)
    extends AbstractConfigValue(origin)
    with Serializable {
  override def valueType: ConfigValueType = ConfigValueType.NULL

  override def unwrapped: AnyRef = null

  override def transformToString = "null"

  override def render(
      sb: jl.StringBuilder,
      indent: Int,
      atRoot: Boolean,
      options: ConfigRenderOptions
  ): Unit = {
    sb.append("null")
  }

  override def newCopy(origin: ConfigOrigin) = new ConfigNull(origin)

  // serialization all goes through SerializedConfigValue
  @throws[ObjectStreamException]
  private def writeReplace(): jl.Object = new SerializedConfigValue(this)
}