src/main/scala/li/cil/oc/common/item/Tablet.scala - minecraft/opencomputers - Rivoreo Source Code Repositories

 package li.cil.oc.common.item

 import java.lang.Iterable
 import java.util
 import java.util.UUID
 import java.util.concurrent.Callable
 import java.util.concurrent.TimeUnit

 import com.google.common.cache.CacheBuilder
 import com.google.common.cache.RemovalListener
 import com.google.common.cache.RemovalNotification
 import cpw.mods.fml.common.eventhandler.SubscribeEvent
 import cpw.mods.fml.common.gameevent.TickEvent.ClientTickEvent
 import cpw.mods.fml.common.gameevent.TickEvent.ServerTickEvent
 import cpw.mods.fml.relauncher.Side
 import cpw.mods.fml.relauncher.SideOnly
 import li.cil.oc.Constants
 import li.cil.oc.Localization
 import li.cil.oc.OpenComputers
 import li.cil.oc.Settings
 import li.cil.oc.api
 import li.cil.oc.api.Driver
 import li.cil.oc.api.Machine
 import li.cil.oc.api.driver.item.Container
 import li.cil.oc.api.internal
 import li.cil.oc.api.machine.MachineHost
 import li.cil.oc.api.network.Message
 import li.cil.oc.api.network.Node
 import li.cil.oc.client.KeyBindings
 import li.cil.oc.common.GuiType
 import li.cil.oc.common.Slot
 import li.cil.oc.common.Tier
 import li.cil.oc.common.inventory.ComponentInventory
 import li.cil.oc.common.item.data.TabletData
 import li.cil.oc.integration.opencomputers.DriverScreen
 import li.cil.oc.server.component
 import li.cil.oc.util.Audio
 import li.cil.oc.util.BlockPosition
 import li.cil.oc.util.ExtendedNBT._
 import li.cil.oc.util.Rarity
 import li.cil.oc.util.RotationHelper
 import li.cil.oc.util.Tooltip
 import net.minecraft.entity.Entity
 import net.minecraft.entity.player.EntityPlayer
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.NBTTagCompound
 import net.minecraft.world.World
 import net.minecraftforge.common.util.ForgeDirection
 import net.minecraftforge.event.world.WorldEvent

 import scala.collection.convert.WrapAsJava._
 import scala.collection.convert.WrapAsScala._

 class Tablet(val parent: Delegator) extends Delegate {
   final val TimeToAnalyze = 10

   // Must be assembled to be usable so we hide it in the item list.
   showInItemList = false

   override def maxStackSize = 1

   private var iconOn: Option[Icon] = None
   private var iconOff: Option[Icon] = None

   @SideOnly(Side.CLIENT)
   override def icon(stack: ItemStack, pass: Int) = {
     if (stack.hasTagCompound) {
       val data = new TabletData(stack)
       if (data.isRunning) iconOn else iconOff
     } else super.icon(stack, pass)
   }

   override def registerIcons(iconRegister: IconRegister) = {
     super.registerIcons(iconRegister)

     iconOn = Option(iconRegister.registerIcon(Settings.resourceDomain + ":TabletOn"))
     iconOff = Option(iconRegister.registerIcon(Settings.resourceDomain + ":TabletOff"))
   }

   // ----------------------------------------------------------------------- //

   override protected def tooltipExtended(stack: ItemStack, tooltip: util.List[String]): Unit = {
     if (KeyBindings.showExtendedTooltips) {
       val info = new TabletData(stack)
       // Ignore/hide the screen.
       val components = info.items.drop(1)
       if (components.length > 1) {
         tooltip.addAll(Tooltip.get("Server.Components"))
         components.collect {
           case Some(component) => tooltip.add("- " + component.getDisplayName)
         }
       }
     }
   }

   override def rarity(stack: ItemStack) = {
     val data = new TabletData(stack)
     Rarity.byTier(data.tier)
   }

   override def isDamageable = true

   override def damage(stack: ItemStack) = {
     val nbt = stack.getTagCompound
     if (nbt != null) {
       val data = new TabletData()
       data.load(nbt)
       (data.maxEnergy - data.energy).toInt
     }
     else 100
   }

   override def maxDamage(stack: ItemStack) = {
     val nbt = stack.getTagCompound
     if (nbt != null) {
       val data = new TabletData()
       data.load(nbt)
       data.maxEnergy.toInt max 1
     }
     else 100
   }

   // ----------------------------------------------------------------------- //

   override def update(stack: ItemStack, world: World, entity: Entity, slot: Int, selected: Boolean) =
     entity match {
       case player: EntityPlayer =>
         // Play an audio cue to let players know when they finished analyzing a block.
         if (world.isRemote && player.getItemInUseDuration == TimeToAnalyze && api.Items.get(player.getItemInUse) == api.Items.get(Constants.ItemName.Tablet)) {
           Audio.play(player.posX.toFloat, player.posY.toFloat + 2, player.posZ.toFloat, ".")
         }
         Tablet.get(stack, player).update(world, player, slot, selected)
       case _ =>
     }

   override def onItemUseFirst(stack: ItemStack, player: EntityPlayer, position: BlockPosition, side: Int, hitX: Float, hitY: Float, hitZ: Float): Boolean = {
     Tablet.currentlyAnalyzing = Some((position, side, hitX, hitY, hitZ))
     super.onItemUseFirst(stack, player, position, side, hitX, hitY, hitZ)
   }

   override def onItemUse(stack: ItemStack, player: EntityPlayer, position: BlockPosition, side: Int, hitX: Float, hitY: Float, hitZ: Float): Boolean = {
     player.setItemInUse(stack, getMaxItemUseDuration(stack))
     true
   }

   override def onItemRightClick(stack: ItemStack, world: World, player: EntityPlayer) = {
     player.setItemInUse(stack, getMaxItemUseDuration(stack))
     stack
   }

   override def getMaxItemUseDuration(stack: ItemStack): Int = 72000

   override def onPlayerStoppedUsing(stack: ItemStack, player: EntityPlayer, duration: Int): Unit = {
     val world = player.getEntityWorld
     val didAnalyze = getMaxItemUseDuration(stack) - duration >= TimeToAnalyze
     if (didAnalyze) {
       if (!world.isRemote) {
         Tablet.currentlyAnalyzing match {
           case Some((position, side, hitX, hitY, hitZ)) => try {
             val computer = Tablet.get(stack, player).machine
             if (computer.isRunning) {
               val data = new NBTTagCompound()
               computer.node.sendToReachable("tablet.use", data, stack, player, position, ForgeDirection.getOrientation(side), float2Float(hitX), float2Float(hitY), float2Float(hitZ))
               if (!data.hasNoTags) {
                 computer.signal("tablet_use", data)
               }
             }
           }
           catch {
             case t: Throwable => OpenComputers.log.warn("Block analysis on tablet right click failed gloriously!", t)
           }
           case _ =>
         }
       }
     }
     else {
       if (player.isSneaking) {
         if (!world.isRemote) {
           val tablet = Tablet.Server.get(stack, player)
           tablet.machine.stop()
           if (tablet.data.tier > Tier.One) {
             player.openGui(OpenComputers, GuiType.TabletInner.id, world, 0, 0, 0)
           }
         }
       }
       else {
         if (!world.isRemote) {
           val computer = Tablet.get(stack, player).machine
           computer.start()
           computer.lastError match {
             case message if message != null => player.addChatMessage(Localization.Analyzer.LastError(message))
             case _ =>
           }
         }
         else {
           player.openGui(OpenComputers, GuiType.Tablet.id, world, 0, 0, 0)
         }
       }
     }
   }
 }

 class TabletWrapper(var stack: ItemStack, var player: EntityPlayer) extends ComponentInventory with MachineHost with internal.Tablet {
   // Remember our *original* world, so we know which tablets to clear on dimension
   // changes of players holding tablets - since the player entity instance may be
   // kept the same and components are not required to properly handle world changes.
   val world = player.worldObj

   lazy val machine = if (world.isRemote) null else Machine.create(this)

   val data = new TabletData()

   val tablet = if (world.isRemote) null else new component.Tablet(this)

   private var isInitialized = !world.isRemote

   private var lastRunning = false

   def items = data.items

   override def facing = RotationHelper.fromYaw(player.rotationYaw)

   override def toLocal(value: ForgeDirection) = value // -T-O-D-O- do we care? no we don't

   override def toGlobal(value: ForgeDirection) = value // -T-O-D-O- do we care? no we don't

   def readFromNBT() {
     if (stack.hasTagCompound) {
       val data = stack.getTagCompound
       load(data)
       if (!world.isRemote) {
         tablet.load(data.getCompoundTag(Settings.namespace + "component"))
         machine.load(data.getCompoundTag(Settings.namespace + "data"))
       }
     }
   }

   def writeToNBT() {
     if (!stack.hasTagCompound) {
       stack.setTagCompound(new NBTTagCompound())
     }
     val data = stack.getTagCompound
     if (!world.isRemote) {
       if (!data.hasKey(Settings.namespace + "data")) {
         data.setTag(Settings.namespace + "data", new NBTTagCompound())
       }
       data.setNewCompoundTag(Settings.namespace + "component", tablet.save)
       data.setNewCompoundTag(Settings.namespace + "data", machine.save)

       // Force tablets into stopped state to avoid errors when trying to
       // load deleted machine states.
       data.getCompoundTag(Settings.namespace + "data").removeTag("state")
     }
     save(data)
   }

   readFromNBT()
   if (!world.isRemote) {
     api.Network.joinNewNetwork(machine.node)
     machine.stop()
     val charge = math.max(0, this.data.energy - tablet.node.globalBuffer)
     tablet.node.changeBuffer(charge)
     writeToNBT()
   }

   // ----------------------------------------------------------------------- //

   override def onConnect(node: Node) {
     if (node == this.node) {
       connectComponents()
       node.connect(tablet.node)
     }
     else node.host match {
       case buffer: api.component.TextBuffer =>
         buffer.setMaximumColorDepth(api.component.TextBuffer.ColorDepth.FourBit)
         buffer.setMaximumResolution(80, 25)
       case _ =>
     }
   }

   override protected def connectItemNode(node: Node) {
     super.connectItemNode(node)
     if (node != null) node.host match {
       case buffer: api.component.TextBuffer => components collect {
         case Some(keyboard: api.component.Keyboard) => buffer.node.connect(keyboard.node)
       }
       case keyboard: api.component.Keyboard => components collect {
         case Some(buffer: api.component.TextBuffer) => keyboard.node.connect(buffer.node)
       }
       case _ =>
     }
   }

   override def onDisconnect(node: Node) {
     if (node == this.node) {
       disconnectComponents()
       tablet.node.remove()
     }
   }

   override def onMessage(message: Message) {}

   override def host = this

   override def getSizeInventory = items.length

   override def isItemValidForSlot(slot: Int, stack: ItemStack) = slot == getSizeInventory - 1 && (Option(Driver.driverFor(stack, getClass)) match {
     case Some(driver) =>
       // Same special cases, similar as in robot, but allow keyboards,
       // because clip-on keyboards kinda seem to make sense, I guess.
       driver != DriverScreen &&
         driver.slot(stack) == containerSlotType &&
         driver.tier(stack) <= containerSlotTier
     case _ => false
   })

   override def isUseableByPlayer(player: EntityPlayer) = machine.canInteract(player.getCommandSenderName)

   override def markDirty(): Unit = {
     data.save(stack)
     player.inventory.markDirty()
   }

   // ----------------------------------------------------------------------- //

   override def xPosition = player.posX

   override def yPosition = player.posY + player.getEyeHeight

   override def zPosition = player.posZ

   override def markChanged() {}

   // ----------------------------------------------------------------------- //

   def containerSlotType = data.container.fold(Slot.None)(stack =>
     Option(Driver.driverFor(stack, getClass)) match {
       case Some(driver: Container) => driver.providedSlot(stack)
       case _ => Slot.None
     })

   def containerSlotTier = data.container.fold(Tier.None)(stack =>
     Option(Driver.driverFor(stack, getClass)) match {
       case Some(driver: Container) => driver.providedTier(stack)
       case _ => Tier.None
     })

   override def internalComponents(): Iterable[ItemStack] = (0 until getSizeInventory).collect {
     case slot if isComponentSlot(slot) && getStackInSlot(slot) != null => getStackInSlot(slot)
   }

   override def componentSlot(address: String) = components.indexWhere(_.exists(env => env.node != null && env.node.address == address))

   override def onMachineConnect(node: Node) = onConnect(node)

   override def onMachineDisconnect(node: Node) = onDisconnect(node)

   // ----------------------------------------------------------------------- //

   override def node = Option(machine).fold(null: Node)(_.node)

   // ----------------------------------------------------------------------- //

   def update(world: World, player: EntityPlayer, slot: Int, selected: Boolean) {
     this.player = player
     if (!isInitialized) {
       isInitialized = true
       // This delayed initialization on the client side is required to allow
       // the server to set up the tablet wrapper first (since packets generated
       // in the component setup would otherwise be queued before the events that
       // caused this wrapper's initialization).
       connectComponents()
       components collect {
         case Some(buffer: api.component.TextBuffer) =>
           buffer.setMaximumColorDepth(api.component.TextBuffer.ColorDepth.FourBit)
           buffer.setMaximumResolution(80, 25)
       }
     }
     if (!world.isRemote) {
       machine.update()
       updateComponents()
       data.isRunning = machine.isRunning
       data.energy = tablet.node.globalBuffer()
       data.maxEnergy = tablet.node.globalBufferSize()

       if (lastRunning != machine.isRunning) {
         lastRunning = machine.isRunning
         markDirty()
       }
     }
   }

   // ----------------------------------------------------------------------- //

   override def load(nbt: NBTTagCompound) {
     data.load(nbt)
   }

   override def save(nbt: NBTTagCompound) {
     saveComponents()
     data.save(nbt)
   }
 }

 object Tablet {
   // This is super-hacky, but since it's only used on the client we get away
   // with storing context information for analyzing a block in the singleton.
   var currentlyAnalyzing: Option[(BlockPosition, Int, Float, Float, Float)] = None

   def getId(stack: ItemStack) = {

     if (!stack.hasTagCompound) {
       stack.setTagCompound(new NBTTagCompound())
     }
     if (!stack.getTagCompound.hasKey(Settings.namespace + "tablet")) {
       stack.getTagCompound.setString(Settings.namespace + "tablet", UUID.randomUUID().toString)
     }
     stack.getTagCompound.getString(Settings.namespace + "tablet")
   }

   def get(stack: ItemStack, holder: EntityPlayer) = {
     if (holder.worldObj.isRemote) Client.get(stack, holder)
     else Server.get(stack, holder)
   }

   @SubscribeEvent
   def onWorldSave(e: WorldEvent.Save) {
     Server.saveAll(e.world)
   }

   @SubscribeEvent
   def onWorldUnload(e: WorldEvent.Unload) {
     Client.clear(e.world)
     Server.clear(e.world)
   }

   @SubscribeEvent
   def onClientTick(e: ClientTickEvent) {
     Client.cleanUp()
   }

   @SubscribeEvent
   def onServerTick(e: ServerTickEvent) {
     Server.cleanUp()
   }

   abstract class Cache extends Callable[TabletWrapper] with RemovalListener[String, TabletWrapper] {
     val cache = com.google.common.cache.CacheBuilder.newBuilder().
       expireAfterAccess(timeout, TimeUnit.SECONDS).
       removalListener(this).
       asInstanceOf[CacheBuilder[String, TabletWrapper]].
       build[String, TabletWrapper]()

     protected def timeout = 10

     // To allow access in cache entry init.
     private var currentStack: ItemStack = _

     private var currentHolder: EntityPlayer = _

     def get(stack: ItemStack, holder: EntityPlayer) = {
       val id = getId(stack)
       cache.synchronized {
         currentStack = stack
         currentHolder = holder
         var wrapper = cache.get(id, this)

         // Force re-load on world change, in case some components store a
         // reference to the world object.
         if (holder.worldObj != wrapper.world) {
           cache.invalidate(id)
           cache.cleanUp()
           wrapper = cache.get(id, this)
         }

         wrapper.stack = stack
         wrapper.player = holder
         wrapper
       }
     }

     def call = {
       new TabletWrapper(currentStack, currentHolder)
     }

     def onRemoval(e: RemovalNotification[String, TabletWrapper]) {
       val tablet = e.getValue
       if (tablet.node != null) {
         // Server.
         tablet.writeToNBT()
         tablet.machine.stop()
         for (node <- tablet.machine.node.network.nodes) {
           node.remove()
         }
         tablet.writeToNBT()
       }
     }

     def clear(world: World) {
       cache.synchronized {
         val tabletsInWorld = cache.asMap.filter(_._2.world == world)
         cache.invalidateAll(asJavaIterable(tabletsInWorld.keys))
         cache.cleanUp()
       }
     }

     def cleanUp() {
       cache.synchronized(cache.cleanUp())
     }
   }

   object Client extends Cache {
     override protected def timeout = 5

     def get(stack: ItemStack) = {
       if (stack.hasTagCompound && stack.getTagCompound.hasKey(Settings.namespace + "tablet")) {
         val id = stack.getTagCompound.getString(Settings.namespace + "tablet")
         cache.synchronized(Option(cache.getIfPresent(id)))
       }
       else None
     }
   }

   object Server extends Cache {
     def saveAll(world: World) {
       cache.synchronized {
         for (tablet <- cache.asMap.values if tablet.world == world) {
           tablet.writeToNBT()
         }
       }
     }
   }

 }
	package li.cil.oc.common.item

	import java.lang.Iterable
	import java.util
	import java.util.UUID
	import java.util.concurrent.Callable
	import java.util.concurrent.TimeUnit

	import com.google.common.cache.CacheBuilder
	import com.google.common.cache.RemovalListener
	import com.google.common.cache.RemovalNotification
	import cpw.mods.fml.common.eventhandler.SubscribeEvent
	import cpw.mods.fml.common.gameevent.TickEvent.ClientTickEvent
	import cpw.mods.fml.common.gameevent.TickEvent.ServerTickEvent
	import cpw.mods.fml.relauncher.Side
	import cpw.mods.fml.relauncher.SideOnly
	import li.cil.oc.Constants
	import li.cil.oc.Localization
	import li.cil.oc.OpenComputers
	import li.cil.oc.Settings
	import li.cil.oc.api
	import li.cil.oc.api.Driver
	import li.cil.oc.api.Machine
	import li.cil.oc.api.driver.item.Container
	import li.cil.oc.api.internal
	import li.cil.oc.api.machine.MachineHost
	import li.cil.oc.api.network.Message
	import li.cil.oc.api.network.Node
	import li.cil.oc.client.KeyBindings
	import li.cil.oc.common.GuiType
	import li.cil.oc.common.Slot
	import li.cil.oc.common.Tier
	import li.cil.oc.common.inventory.ComponentInventory
	import li.cil.oc.common.item.data.TabletData
	import li.cil.oc.integration.opencomputers.DriverScreen
	import li.cil.oc.server.component
	import li.cil.oc.util.Audio
	import li.cil.oc.util.BlockPosition
	import li.cil.oc.util.ExtendedNBT._
	import li.cil.oc.util.Rarity
	import li.cil.oc.util.RotationHelper
	import li.cil.oc.util.Tooltip
	import net.minecraft.entity.Entity
	import net.minecraft.entity.player.EntityPlayer
	import net.minecraft.item.ItemStack
	import net.minecraft.nbt.NBTTagCompound
	import net.minecraft.world.World
	import net.minecraftforge.common.util.ForgeDirection
	import net.minecraftforge.event.world.WorldEvent

	import scala.collection.convert.WrapAsJava._
	import scala.collection.convert.WrapAsScala._

	class Tablet(val parent: Delegator) extends Delegate {
	final val TimeToAnalyze = 10

	// Must be assembled to be usable so we hide it in the item list.
	showInItemList = false

	override def maxStackSize = 1

	private var iconOn: Option[Icon] = None
	private var iconOff: Option[Icon] = None

	@SideOnly(Side.CLIENT)
	override def icon(stack: ItemStack, pass: Int) = {
	if (stack.hasTagCompound) {
	val data = new TabletData(stack)
	if (data.isRunning) iconOn else iconOff
	} else super.icon(stack, pass)
	}

	override def registerIcons(iconRegister: IconRegister) = {
	super.registerIcons(iconRegister)

	iconOn = Option(iconRegister.registerIcon(Settings.resourceDomain + ":TabletOn"))
	iconOff = Option(iconRegister.registerIcon(Settings.resourceDomain + ":TabletOff"))
	}

	// ----------------------------------------------------------------------- //

	override protected def tooltipExtended(stack: ItemStack, tooltip: util.List[String]): Unit = {
	if (KeyBindings.showExtendedTooltips) {
	val info = new TabletData(stack)
	// Ignore/hide the screen.
	val components = info.items.drop(1)
	if (components.length > 1) {
	tooltip.addAll(Tooltip.get("Server.Components"))
	components.collect {
	case Some(component) => tooltip.add("- " + component.getDisplayName)
	}
	}
	}
	}

	override def rarity(stack: ItemStack) = {
	val data = new TabletData(stack)
	Rarity.byTier(data.tier)
	}

	override def isDamageable = true

	override def damage(stack: ItemStack) = {
	val nbt = stack.getTagCompound
	if (nbt != null) {
	val data = new TabletData()
	data.load(nbt)
	(data.maxEnergy - data.energy).toInt
	}
	else 100
	}

	override def maxDamage(stack: ItemStack) = {
	val nbt = stack.getTagCompound
	if (nbt != null) {
	val data = new TabletData()
	data.load(nbt)
	data.maxEnergy.toInt max 1
	}
	else 100
	}

	// ----------------------------------------------------------------------- //

	override def update(stack: ItemStack, world: World, entity: Entity, slot: Int, selected: Boolean) =
	entity match {
	case player: EntityPlayer =>
	// Play an audio cue to let players know when they finished analyzing a block.
	if (world.isRemote && player.getItemInUseDuration == TimeToAnalyze && api.Items.get(player.getItemInUse) == api.Items.get(Constants.ItemName.Tablet)) {
	Audio.play(player.posX.toFloat, player.posY.toFloat + 2, player.posZ.toFloat, ".")
	}
	Tablet.get(stack, player).update(world, player, slot, selected)
	case _ =>
	}

	override def onItemUseFirst(stack: ItemStack, player: EntityPlayer, position: BlockPosition, side: Int, hitX: Float, hitY: Float, hitZ: Float): Boolean = {
	Tablet.currentlyAnalyzing = Some((position, side, hitX, hitY, hitZ))
	super.onItemUseFirst(stack, player, position, side, hitX, hitY, hitZ)
	}

	override def onItemUse(stack: ItemStack, player: EntityPlayer, position: BlockPosition, side: Int, hitX: Float, hitY: Float, hitZ: Float): Boolean = {
	player.setItemInUse(stack, getMaxItemUseDuration(stack))
	true
	}

	override def onItemRightClick(stack: ItemStack, world: World, player: EntityPlayer) = {
	player.setItemInUse(stack, getMaxItemUseDuration(stack))
	stack
	}

	override def getMaxItemUseDuration(stack: ItemStack): Int = 72000

	override def onPlayerStoppedUsing(stack: ItemStack, player: EntityPlayer, duration: Int): Unit = {
	val world = player.getEntityWorld
	val didAnalyze = getMaxItemUseDuration(stack) - duration >= TimeToAnalyze
	if (didAnalyze) {
	if (!world.isRemote) {
	Tablet.currentlyAnalyzing match {
	case Some((position, side, hitX, hitY, hitZ)) => try {
	val computer = Tablet.get(stack, player).machine
	if (computer.isRunning) {
	val data = new NBTTagCompound()
	computer.node.sendToReachable("tablet.use", data, stack, player, position, ForgeDirection.getOrientation(side), float2Float(hitX), float2Float(hitY), float2Float(hitZ))
	if (!data.hasNoTags) {
	computer.signal("tablet_use", data)
	}
	}
	}
	catch {
	case t: Throwable => OpenComputers.log.warn("Block analysis on tablet right click failed gloriously!", t)
	}
	case _ =>
	}
	}
	}
	else {
	if (player.isSneaking) {
	if (!world.isRemote) {
	val tablet = Tablet.Server.get(stack, player)
	tablet.machine.stop()
	if (tablet.data.tier > Tier.One) {
	player.openGui(OpenComputers, GuiType.TabletInner.id, world, 0, 0, 0)
	}
	}
	}
	else {
	if (!world.isRemote) {
	val computer = Tablet.get(stack, player).machine
	computer.start()
	computer.lastError match {
	case message if message != null => player.addChatMessage(Localization.Analyzer.LastError(message))
	case _ =>
	}
	}
	else {
	player.openGui(OpenComputers, GuiType.Tablet.id, world, 0, 0, 0)
	}
	}
	}
	}
	}

	class TabletWrapper(var stack: ItemStack, var player: EntityPlayer) extends ComponentInventory with MachineHost with internal.Tablet {
	// Remember our original world, so we know which tablets to clear on dimension
	// changes of players holding tablets - since the player entity instance may be
	// kept the same and components are not required to properly handle world changes.
	val world = player.worldObj

	lazy val machine = if (world.isRemote) null else Machine.create(this)

	val data = new TabletData()

	val tablet = if (world.isRemote) null else new component.Tablet(this)

	private var isInitialized = !world.isRemote

	private var lastRunning = false

	def items = data.items

	override def facing = RotationHelper.fromYaw(player.rotationYaw)

	override def toLocal(value: ForgeDirection) = value // -T-O-D-O- do we care? no we don't

	override def toGlobal(value: ForgeDirection) = value // -T-O-D-O- do we care? no we don't

	def readFromNBT() {
	if (stack.hasTagCompound) {
	val data = stack.getTagCompound
	load(data)
	if (!world.isRemote) {
	tablet.load(data.getCompoundTag(Settings.namespace + "component"))
	machine.load(data.getCompoundTag(Settings.namespace + "data"))
	}
	}
	}

	def writeToNBT() {
	if (!stack.hasTagCompound) {
	stack.setTagCompound(new NBTTagCompound())
	}
	val data = stack.getTagCompound
	if (!world.isRemote) {
	if (!data.hasKey(Settings.namespace + "data")) {
	data.setTag(Settings.namespace + "data", new NBTTagCompound())
	}
	data.setNewCompoundTag(Settings.namespace + "component", tablet.save)
	data.setNewCompoundTag(Settings.namespace + "data", machine.save)

	// Force tablets into stopped state to avoid errors when trying to
	// load deleted machine states.
	data.getCompoundTag(Settings.namespace + "data").removeTag("state")
	}
	save(data)
	}

	readFromNBT()
	if (!world.isRemote) {
	api.Network.joinNewNetwork(machine.node)
	machine.stop()
	val charge = math.max(0, this.data.energy - tablet.node.globalBuffer)
	tablet.node.changeBuffer(charge)
	writeToNBT()
	}

	// ----------------------------------------------------------------------- //

	override def onConnect(node: Node) {
	if (node == this.node) {
	connectComponents()
	node.connect(tablet.node)
	}
	else node.host match {
	case buffer: api.component.TextBuffer =>
	buffer.setMaximumColorDepth(api.component.TextBuffer.ColorDepth.FourBit)
	buffer.setMaximumResolution(80, 25)
	case _ =>
	}
	}

	override protected def connectItemNode(node: Node) {
	super.connectItemNode(node)
	if (node != null) node.host match {
	case buffer: api.component.TextBuffer => components collect {
	case Some(keyboard: api.component.Keyboard) => buffer.node.connect(keyboard.node)
	}
	case keyboard: api.component.Keyboard => components collect {
	case Some(buffer: api.component.TextBuffer) => keyboard.node.connect(buffer.node)
	}
	case _ =>
	}
	}

	override def onDisconnect(node: Node) {
	if (node == this.node) {
	disconnectComponents()
	tablet.node.remove()
	}
	}

	override def onMessage(message: Message) {}

	override def host = this

	override def getSizeInventory = items.length

	override def isItemValidForSlot(slot: Int, stack: ItemStack) = slot == getSizeInventory - 1 && (Option(Driver.driverFor(stack, getClass)) match {
	case Some(driver) =>
	// Same special cases, similar as in robot, but allow keyboards,
	// because clip-on keyboards kinda seem to make sense, I guess.
	driver != DriverScreen &&
	driver.slot(stack) == containerSlotType &&
	driver.tier(stack) <= containerSlotTier
	case _ => false
	})

	override def isUseableByPlayer(player: EntityPlayer) = machine.canInteract(player.getCommandSenderName)

	override def markDirty(): Unit = {
	data.save(stack)
	player.inventory.markDirty()
	}

	// ----------------------------------------------------------------------- //

	override def xPosition = player.posX

	override def yPosition = player.posY + player.getEyeHeight

	override def zPosition = player.posZ

	override def markChanged() {}

	// ----------------------------------------------------------------------- //

	def containerSlotType = data.container.fold(Slot.None)(stack =>
	Option(Driver.driverFor(stack, getClass)) match {
	case Some(driver: Container) => driver.providedSlot(stack)
	case _ => Slot.None
	})

	def containerSlotTier = data.container.fold(Tier.None)(stack =>
	Option(Driver.driverFor(stack, getClass)) match {
	case Some(driver: Container) => driver.providedTier(stack)
	case _ => Tier.None
	})

	override def internalComponents(): Iterable[ItemStack] = (0 until getSizeInventory).collect {
	case slot if isComponentSlot(slot) && getStackInSlot(slot) != null => getStackInSlot(slot)
	}

	override def componentSlot(address: String) = components.indexWhere(_.exists(env => env.node != null && env.node.address == address))

	override def onMachineConnect(node: Node) = onConnect(node)

	override def onMachineDisconnect(node: Node) = onDisconnect(node)

	// ----------------------------------------------------------------------- //

	override def node = Option(machine).fold(null: Node)(_.node)

	// ----------------------------------------------------------------------- //

	def update(world: World, player: EntityPlayer, slot: Int, selected: Boolean) {
	this.player = player
	if (!isInitialized) {
	isInitialized = true
	// This delayed initialization on the client side is required to allow
	// the server to set up the tablet wrapper first (since packets generated
	// in the component setup would otherwise be queued before the events that
	// caused this wrapper's initialization).
	connectComponents()
	components collect {
	case Some(buffer: api.component.TextBuffer) =>
	buffer.setMaximumColorDepth(api.component.TextBuffer.ColorDepth.FourBit)
	buffer.setMaximumResolution(80, 25)
	}
	}
	if (!world.isRemote) {
	machine.update()
	updateComponents()
	data.isRunning = machine.isRunning
	data.energy = tablet.node.globalBuffer()
	data.maxEnergy = tablet.node.globalBufferSize()

	if (lastRunning != machine.isRunning) {
	lastRunning = machine.isRunning
	markDirty()
	}
	}
	}

	// ----------------------------------------------------------------------- //

	override def load(nbt: NBTTagCompound) {
	data.load(nbt)
	}

	override def save(nbt: NBTTagCompound) {
	saveComponents()
	data.save(nbt)
	}
	}

	object Tablet {
	// This is super-hacky, but since it's only used on the client we get away
	// with storing context information for analyzing a block in the singleton.
	var currentlyAnalyzing: Option[(BlockPosition, Int, Float, Float, Float)] = None

	def getId(stack: ItemStack) = {

	if (!stack.hasTagCompound) {
	stack.setTagCompound(new NBTTagCompound())
	}
	if (!stack.getTagCompound.hasKey(Settings.namespace + "tablet")) {
	stack.getTagCompound.setString(Settings.namespace + "tablet", UUID.randomUUID().toString)
	}
	stack.getTagCompound.getString(Settings.namespace + "tablet")
	}

	def get(stack: ItemStack, holder: EntityPlayer) = {
	if (holder.worldObj.isRemote) Client.get(stack, holder)
	else Server.get(stack, holder)
	}

	@SubscribeEvent
	def onWorldSave(e: WorldEvent.Save) {
	Server.saveAll(e.world)
	}

	@SubscribeEvent
	def onWorldUnload(e: WorldEvent.Unload) {
	Client.clear(e.world)
	Server.clear(e.world)
	}

	@SubscribeEvent
	def onClientTick(e: ClientTickEvent) {
	Client.cleanUp()
	}

	@SubscribeEvent
	def onServerTick(e: ServerTickEvent) {
	Server.cleanUp()
	}

	abstract class Cache extends Callable[TabletWrapper] with RemovalListener[String, TabletWrapper] {
	val cache = com.google.common.cache.CacheBuilder.newBuilder().
	expireAfterAccess(timeout, TimeUnit.SECONDS).
	removalListener(this).
	asInstanceOf[CacheBuilder[String, TabletWrapper]].
	build[String, TabletWrapper]()

	protected def timeout = 10

	// To allow access in cache entry init.
	private var currentStack: ItemStack = _

	private var currentHolder: EntityPlayer = _

	def get(stack: ItemStack, holder: EntityPlayer) = {
	val id = getId(stack)
	cache.synchronized {
	currentStack = stack
	currentHolder = holder
	var wrapper = cache.get(id, this)

	// Force re-load on world change, in case some components store a
	// reference to the world object.
	if (holder.worldObj != wrapper.world) {
	cache.invalidate(id)
	cache.cleanUp()
	wrapper = cache.get(id, this)
	}

	wrapper.stack = stack
	wrapper.player = holder
	wrapper
	}
	}

	def call = {
	new TabletWrapper(currentStack, currentHolder)
	}

	def onRemoval(e: RemovalNotification[String, TabletWrapper]) {
	val tablet = e.getValue
	if (tablet.node != null) {
	// Server.
	tablet.writeToNBT()
	tablet.machine.stop()
	for (node <- tablet.machine.node.network.nodes) {
	node.remove()
	}
	tablet.writeToNBT()
	}
	}

	def clear(world: World) {
	cache.synchronized {
	val tabletsInWorld = cache.asMap.filter(_._2.world == world)
	cache.invalidateAll(asJavaIterable(tabletsInWorld.keys))
	cache.cleanUp()
	}
	}

	def cleanUp() {
	cache.synchronized(cache.cleanUp())
	}
	}

	object Client extends Cache {
	override protected def timeout = 5

	def get(stack: ItemStack) = {
	if (stack.hasTagCompound && stack.getTagCompound.hasKey(Settings.namespace + "tablet")) {
	val id = stack.getTagCompound.getString(Settings.namespace + "tablet")
	cache.synchronized(Option(cache.getIfPresent(id)))
	}
	else None
	}
	}

	object Server extends Cache {
	def saveAll(world: World) {
	cache.synchronized {
	for (tablet <- cache.asMap.values if tablet.world == world) {
	tablet.writeToNBT()
	}
	}
	}
	}

	}