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IFilePromise  - AS3

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com.adobe.livecycle.ria.security.api
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com.adobe.mosaic.sparklib.text
com.adobe.mosaic.sparklib.util
com.adobe.solutions.acm.authoring.presentation
com.adobe.solutions.acm.authoring.presentation.actionbar
com.adobe.solutions.acm.authoring.presentation.common
com.adobe.solutions.acm.authoring.presentation.events
com.adobe.solutions.acm.authoring.presentation.fragment
com.adobe.solutions.acm.authoring.presentation.letter
com.adobe.solutions.acm.authoring.presentation.letter.data
com.adobe.solutions.acm.authoring.presentation.preview
com.adobe.solutions.acm.authoring.presentation.rte
com.adobe.solutions.acm.ccr.presentation
com.adobe.solutions.acm.ccr.presentation.contentcapture
com.adobe.solutions.acm.ccr.presentation.contentcapture.events
com.adobe.solutions.acm.ccr.presentation.contentcapture.preview
com.adobe.solutions.acm.ccr.presentation.datacapture
com.adobe.solutions.acm.ccr.presentation.datacapture.renderers
com.adobe.solutions.acm.ccr.presentation.pdf
com.adobe.solutions.exm
com.adobe.solutions.exm.authoring
com.adobe.solutions.exm.authoring.components.controls
com.adobe.solutions.exm.authoring.components.toolbars
com.adobe.solutions.exm.authoring.domain
com.adobe.solutions.exm.authoring.domain.expression
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com.adobe.solutions.exm.authoring.domain.method
com.adobe.solutions.exm.authoring.domain.variable
com.adobe.solutions.exm.authoring.enum
com.adobe.solutions.exm.authoring.events
com.adobe.solutions.exm.authoring.model
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com.adobe.solutions.exm.mock
com.adobe.solutions.exm.mock.method
com.adobe.solutions.exm.runtime
com.adobe.solutions.exm.runtime.impl
com.adobe.solutions.exm.variable
com.adobe.solutions.prm.constant
com.adobe.solutions.prm.domain
com.adobe.solutions.prm.domain.factory
com.adobe.solutions.prm.domain.impl
com.adobe.solutions.prm.domain.manager
com.adobe.solutions.prm.presentation.asset
com.adobe.solutions.prm.presentation.constant
com.adobe.solutions.prm.presentation.document
com.adobe.solutions.prm.presentation.event
com.adobe.solutions.prm.presentation.file
com.adobe.solutions.prm.presentation.project
com.adobe.solutions.prm.presentation.team
com.adobe.solutions.prm.presentation.util
com.adobe.solutions.prm.service
com.adobe.solutions.prm.services.impl
com.adobe.solutions.prm.vo
com.adobe.solutions.rca.constant
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com.adobe.solutions.rca.domain.common
com.adobe.solutions.rca.domain.factory
com.adobe.solutions.rca.domain.impl
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com.adobe.solutions.rca.presentation
com.adobe.solutions.rca.presentation.comment
com.adobe.solutions.rca.presentation.constant
com.adobe.solutions.rca.presentation.event
com.adobe.solutions.rca.presentation.gantt
com.adobe.solutions.rca.presentation.gantt.ruler
com.adobe.solutions.rca.presentation.template
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com.adobe.solutions.rca.presentation.util
com.adobe.solutions.rca.service
com.adobe.solutions.rca.services.impl
com.adobe.solutions.rca.vo
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com.adobe.viewsource
fl.accessibility
fl.containers
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fl.core
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fl.display
fl.events
fl.ik
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fl.transitions.easing
fl.video
flash.accessibility
flash.concurrent
flash.crypto
flash.data
flash.desktop
flash.display
flash.display3D
flash.display3D.textures
flash.errors
flash.events
flash.external
flash.filesystem
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flash.geom
flash.globalization
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flash.media
flash.net
flash.net.dns
flash.net.drm
flash.notifications
flash.permissions
flash.printing
flash.profiler
flash.sampler
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flash.system
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flash.text.engine
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flash.ui
flash.utils
flash.xml
flashx.textLayout
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flashx.textLayout.container
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flashx.textLayout.elements
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flashx.textLayout.factory
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flashx.undo
ga.controls
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lc.foundation
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lc.foundation.ui
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lc.preloader
lc.procmgmt
lc.procmgmt.commands
lc.procmgmt.domain
lc.procmgmt.events
lc.procmgmt.formbridge
lc.procmgmt.impl
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lc.procmgmt.ui.controls.card
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lc.procmgmt.ui.help
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mx.automation.delegates.core
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mx.binding.utils
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mx.charts.effects.effectClasses
mx.charts.events
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mx.charts.series.items
mx.charts.series.renderData
mx.charts.styles
mx.collections
mx.collections.errors
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mx.containers.accordionClasses
mx.containers.dividedBoxClasses
mx.containers.errors
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mx.controls
mx.controls.advancedDataGridClasses
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mx.controls.sliderClasses
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mx.controls.videoClasses
mx.core
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mx.data
mx.data.crypto
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mx.data.mxml
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mx.effects
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mx.effects.effectClasses
mx.events
mx.filters
mx.flash
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mx.graphics
mx.graphics.codec
mx.graphics.shaderClasses
mx.logging
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mx.logging.targets
mx.managers
mx.messaging
mx.messaging.channels
mx.messaging.config
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mx.modules
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mx.olap.aggregators
mx.preloaders
mx.printing
mx.resources
mx.rpc
mx.rpc.events
mx.rpc.http
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mx.rpc.mxml
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mx.rpc.remoting.mxml
mx.rpc.soap
mx.rpc.soap.mxml
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org.osmf.containers
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org.osmf.layout
org.osmf.logging
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org.osmf.net.qos
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spark.accessibility
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spark.automation.delegates.components.mediaClasses
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spark.components.calendarClasses
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xd.core.axm.enterprise.view.components
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Language Elements

Global Constants
Global Functions
Operators
Statements, Keywords & Directives
Special Types

Appendixes

What's New
Compiler Errors
Compiler Warnings
Run-Time Errors
Migrating to ActionScript 3
Supported Character Sets
MXML Only Tags
Motion XML Elements
Timed Text Tags
List of deprecated elements
Accessibility Implementation Constants
How to Use ActionScript Examples
Legal notices
Packageflash.desktop
Interfacepublic interface IFilePromise
Implementors MediaPromise, URLFilePromise

Language Version: ActionScript 3.0
Runtime Versions: AIR 2

The IFilePromise interface defines the interface used by the AIR runtime to read data for a file promise.

A file promise is a drag-and-drop clipboard format that allows a user to drag a file that does not yet exist out of an AIR application. AIR uses the methods and properties defined by the IFilePromise interface to access the data to be written when the file promise is dropped.

When a file promise is dropped on a suitable target, AIR calls the IFilePromise open() method. The implementation of this method must return the data provider as an object that implements the IDataInput interface. The provider object can be one of the built-in classes, such as ByteArray, FileStream, Socket, and URLStream, or it can be a custom class.

If the data from the data provider is accessed synchronously, such as with a ByteArray, AIR reads the amount of data indicated by the IDataInput bytesAvailable property and writes it to the destination file.

If the data from the data provider is accessed asynchronously, such as with a Socket, AIR uses events dispatched by the provider to regulate the process of reading the data and writing it to the file. Data is read at each progress event until a complete or a close event is received. The runtime listens for the following events (but a data provider does not need to dispatch every event):

  • Event.OPEN
  • ProgressEvent.PROGRESS
  • ProgressEvent.SOCKET_DATA
  • Event.COMPLETE
  • Event.CLOSE
  • IOErrorEvent.IOERROR
  • SecurityErrorEvent.SECURITY_ERROR
  • HTTPStatusEvent.HTTP_STATUS
  • HTTPStatusEvent.HTTP_RESPONSE_STATUS

Custom data provider classes should dispatch either a progress event or a socketData event when data is available. Likewise, either a complete or a close event should be dispatched when all the requested data has been read. The error events inform the runtime that the data transfer has failed and should be aborted. The other events should be dispatched as appropriate to aid in error handling and in debugging application logic.

The methods defined by IFilePromise are only intended to be called by the AIR runtime after a drag and drop operation has completed. Developers should not typically call these methods from their own code.

Note: The URLFilePromise class, available in the air.desktop library implements the IFilePromise interface and uses the URLStream as a data provider. The air.desktop library is included as separate SWF and SWC files in the AIR SDK.

More examples

Related API Elements



Public Properties
 PropertyDefined By
      isAsync : Boolean
[read-only] Indicates whether asynchronous data transfer is supported.
IFilePromise
      relativePath : String
[read-only] The relative path and file name of the file that will be created by this file promise.
IFilePromise
Public Methods
 MethodDefined By
  
    close():void
Called by the AIR runtime when it has finished reading all data.
IFilePromise
  
    open():IDataInput
Returns the data provider object.
IFilePromise
  
Called by the AIR runtime to inform the IFilePromise implementation of errors that occur when reading data from the data provider object.
IFilePromise
Property Detail
    

isAsync

property
isAsync:Boolean  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: AIR 2

Indicates whether asynchronous data transfer is supported.

If true, then the data provider object returned by the open() method must implement the IEventDispatcher interface (or extend a class implementing this interface). The data transfer is driven by progress or socketData events. AIR waits for these data progress events until a complete or a close event is dispatched.

If isAsync returns false, then the AIR runtime assumes that all data is available immediately. In this case, the runtime reads the bytesAvailable property of the data provider object to determine the amount of data available and synchronously reads that amount of data.



Implementation
    public function get isAsync():Boolean
    

relativePath

property 
relativePath:String  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: AIR 2

The relative path and file name of the file that will be created by this file promise.

This property must provide a valid path or an argument error is thrown when the file promise is dropped.

The path can include subdirectories, which are resolved based on the drop location. The subdirectories are created, if needed. When including subdirectories, use the File.separator constant to insert the proper path separator character for the current operating system. Using the .. shortcut to navigate to a parent directory is not allowed. If attempted, an argument error is thrown. Invalid file system characters are stripped from the path without throwing an error.

Note: To allow client code to set the path, you can implement a setter function with the signature: function set relativePath( value:String ):void.



Implementation
    public function get relativePath():String

Throws
ArgumentError — if the relative path uses .. shortcuts to traverse one or more parent directories of the drop target.
Method Detail

    close

()method
public function close():void

Language Version: ActionScript 3.0
Runtime Versions: AIR 2

Called by the AIR runtime when it has finished reading all data.

No methods will be called on the object reference returned by open() after close() has been called. The data provider object can be safely destroyed.

    open

()method 
public function open():IDataInput

Language Version: ActionScript 3.0
Runtime Versions: AIR 2

Returns the data provider object.

The data provider object must implement the IDataInput interface, which defines methods for reading data. If the IFilePromise isAsync property returns true, then the data provider object must also implement the IEventDispatcher interface. The following built-in classes can be used as a data provider:

  • ByteArray (synchronous)
  • FileStream (synchronous or asynchronous)
  • Socket (asynchronous)
  • URLStream (asynchronous)

You can also provide an object of a custom class that implements the required interfaces (or extends another class that implements them).

Returns
IDataInput — IDataInput An object implementing the IDataInput interface. If the data is provided asynchronously, the returned object must also implement the IEventDispatcher interface.

    reportError

()method 
public function reportError(e:ErrorEvent):void

Language Version: ActionScript 3.0
Runtime Versions: AIR 2

Called by the AIR runtime to inform the IFilePromise implementation of errors that occur when reading data from the data provider object.

Parameters

e:ErrorEvent — The error event containing detailed error information.