com.vaadin.ui

Class Upload

java.lang.Object

com.vaadin.server.AbstractClientConnector

com.vaadin.ui.AbstractComponent

com.vaadin.ui.Upload

All Implemented Interfaces:

ConnectorEventListener, ContextClickEvent.ContextClickNotifier, MethodEventSource, SerializableEventListener, ClientConnector, Sizeable, VariableOwner, Connector, Component, Component.Focusable, LegacyComponent, Serializable, EventListener

public class Upload
extends AbstractComponent
implements Component.Focusable, LegacyComponent

Component for uploading files from client to server.

The visible component consists of a file name input box and a browse button and an upload submit button to start uploading.

The Upload component needs a java.io.OutputStream to write the uploaded data. You need to implement the Upload.Receiver interface and return the output stream in the receiveUpload() method.

You can get an event regarding starting (StartedEvent), progress (ProgressEvent), and finishing (FinishedEvent) of upload by implementing StartedListener, ProgressListener, and FinishedListener, respectively. The FinishedListener is called for both failed and succeeded uploads. If you wish to separate between these two cases, you can use SucceededListener (SucceededEvenet) and FailedListener (FailedEvent).

The upload component does not itself show upload progress, but you can use the ProgressIndicator for providing progress feedback by implementing ProgressListener and updating the indicator in updateProgress().

Setting upload component immediate with setImmediateMode(boolean) initiates the upload as soon as a file is selected, instead of the common pattern of file selection field and upload button.

Note! Because of browser dependent implementations of element, setting size for Upload component is not supported. For some browsers setting size may work to some extend.

Since:

3.0

Author:

Vaadin Ltd.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Upload.ChangeEvent Upload.ChangeEvent event is sent when the value (filename) of the upload changes.
static interface	Upload.ChangeListener Listener for Upload.ChangeEvent
static class	Upload.FailedEvent Upload.FailedEvent event is sent when the upload is received, but the reception is interrupted for some reason.
static interface	Upload.FailedListener Receives events when the uploads are finished, but unsuccessful.
static class	Upload.FinishedEvent Upload.FinishedEvent is sent when the upload receives a file, regardless of whether the reception was successful or failed.
static interface	Upload.FinishedListener Receives the events when the uploads are ready.
static class	Upload.NoInputStreamEvent FailedEvent that indicates that an input stream could not be obtained.
static class	Upload.NoOutputStreamEvent FailedEvent that indicates that an output stream could not be obtained.
static interface	Upload.ProgressListener ProgressListener receives events to track progress of upload.
static interface	Upload.Receiver Interface that must be implemented by the upload receivers to provide the Upload component an output stream to write the uploaded data.
static class	Upload.StartedEvent Upload.StartedEvent event is sent when the upload is started to received.
static interface	Upload.StartedListener Receives the events when the upload starts.
static class	Upload.SucceededEvent Upload.SucceededEvent event is sent when the upload is received successfully.
static interface	Upload.SucceededListener Receives events when the uploads are successfully finished.

Nested classes/interfaces inherited from interface com.vaadin.ui.Component

Component.ErrorEvent, Component.Event, Component.Focusable, Component.Listener

Nested classes/interfaces inherited from interface com.vaadin.server.ClientConnector

ClientConnector.AttachEvent, ClientConnector.AttachListener, ClientConnector.ConnectorErrorEvent, ClientConnector.DetachEvent, ClientConnector.DetachListener

Nested classes/interfaces inherited from interface com.vaadin.server.Sizeable

Sizeable.Unit

Field Summary

Fields inherited from class com.vaadin.ui.AbstractComponent

DESIGN_ATTR_PLAIN_TEXT

Fields inherited from interface com.vaadin.server.Sizeable

SIZE_UNDEFINED, UNITS_CM, UNITS_EM, UNITS_EX, UNITS_INCH, UNITS_MM, UNITS_PERCENTAGE, UNITS_PICAS, UNITS_PIXELS, UNITS_POINTS

Constructor Summary

Constructors

Constructor and Description
Upload() Creates a new instance of Upload.
Upload(String caption, Upload.Receiver uploadReceiver)

Method Summary

Modifier and Type	Method and Description
Registration	addChangeListener(Upload.ChangeListener listener) Adds a filename change event listener
Registration	addFailedListener(Upload.FailedListener listener) Adds the upload interrupted event listener.
Registration	addFinishedListener(Upload.FinishedListener listener) Adds the upload received event listener.
Registration	addProgressListener(Upload.ProgressListener listener) Adds the upload progress event listener.
Registration	addStartedListener(Upload.StartedListener listener) Adds the upload started event listener.
Registration	addSucceededListener(Upload.SucceededListener listener) Adds the upload success event listener.
void	changeVariables(Object source, Map<String,Object> variables) Invoked when the value of a variable has changed.
protected void	fireNoInputStream(String filename, String MIMEType, long length)
protected void	fireNoOutputStream(String filename, String MIMEType, long length)
protected void	fireStarted(String filename, String MIMEType) Emit upload received event.
protected void	fireUpdateProgress(long totalBytes, long contentLength) Emits the progress event.
protected void	fireUploadInterrupted(String filename, String MIMEType, long length) Emits the upload failed event.
protected void	fireUploadInterrupted(String filename, String MIMEType, long length, Exception e)
protected void	fireUploadSuccess(String filename, String MIMEType, long length) Emits the upload success event.
void	focus() Sets the focus for this component if the component is Focusable.
String	getButtonCaption()
long	getBytesRead() Gets read bytes of the file currently being uploaded.
Collection<?>	getListeners(Class<?> eventType) Returns all listeners that are registered for the given event type or one of its subclasses.
Upload.Receiver	getReceiver() Returns the current receiver.
protected UploadState	getState() Returns the shared state bean with information to be sent from the server to the client.
protected UploadState	getState(boolean markAsDirty) Returns the shared state for this connector.
protected StreamVariable	getStreamVariable()
int	getTabIndex() Gets the Tabulator index of this Focusable component.
long	getUploadSize() Returns size of file currently being uploaded.
void	interruptUpload() Interrupts the upload currently being received.
boolean	isImmediateMode() Returns the immediate mode of the upload.
boolean	isUploading()
void	markAsDirty() Marks that this connector's state might have changed.
void	paintContent(PaintTarget target) Paints the content of this component.
void	removeChangeListener(Upload.ChangeListener listener) Deprecated.
void	removeFailedListener(Upload.FailedListener listener) Deprecated.
void	removeFinishedListener(Upload.FinishedListener listener) Deprecated.
void	removeProgressListener(Upload.ProgressListener listener) Deprecated.
void	removeStartedListener(Upload.StartedListener listener) Deprecated.
void	removeSucceededListener(Upload.SucceededListener listener) Deprecated.
void	setButtonCaption(String buttonCaption) In addition to the actual file chooser, upload components have button that starts actual upload progress.
void	setImmediateMode(boolean immediateMode) Sets the immediate mode of the upload.
void	setReceiver(Upload.Receiver receiver) Sets the receiver.
void	setTabIndex(int tabIndex) Sets the Tabulator index of this Focusable component.
void	startUpload() Go into upload state.
void	submitUpload() Forces the upload the send selected file to the server.

Methods inherited from class com.vaadin.ui.AbstractComponent

addContextClickListener, addListener, addShortcutListener, addStyleName, attach, beforeClientResponse, detach, findAncestor, fireComponentErrorEvent, fireComponentEvent, getActionManager, getCaption, getComponentError, getCustomAttributes, getData, getDebugId, getDescription, getErrorMessage, getHeight, getHeightUnits, getIcon, getId, getLocale, getParent, getPrimaryStyleName, getStyleName, getWidth, getWidthUnits, isCaptionAsHtml, isConnectorEnabled, isEnabled, isOrHasAncestor, isReadOnly, isRequiredIndicatorVisible, isResponsive, isVisible, readDesign, removeContextClickListener, removeListener, removeShortcutListener, removeStyleName, setCaption, setCaptionAsHtml, setComponentError, setData, setDebugId, setDescription, setDescription, setEnabled, setHeight, setHeight, setHeightUndefined, setIcon, setId, setLocale, setParent, setPrimaryStyleName, setReadOnly, setRequiredIndicatorVisible, setResponsive, setSizeFull, setSizeUndefined, setStyleName, setStyleName, setVisible, setWidth, setWidth, setWidthUndefined, writeDesign

Methods inherited from class com.vaadin.server.AbstractClientConnector

addAttachListener, addDetachListener, addExtension, addListener, addListener, addListener, addMethodInvocationToQueue, createState, encodeState, equals, fireEvent, getAllChildrenIterable, getConnectorId, getErrorHandler, getExtensions, getResource, getRpcManager, getRpcProxy, getSession, getStateType, getUI, handleConnectorRequest, hashCode, hasListeners, isAttached, isThis, markAsDirtyRecursive, registerRpc, registerRpc, removeAttachListener, removeDetachListener, removeExtension, removeListener, removeListener, removeListener, removeListener, requestRepaint, requestRepaintAll, retrievePendingRpcCalls, setErrorHandler, setResource, updateDiffstate

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.vaadin.server.VariableOwner

isEnabled

Methods inherited from interface com.vaadin.ui.Component

addListener, addStyleName, attach, getCaption, getDescription, getIcon, getId, getLocale, getParent, getPrimaryStyleName, getStyleName, getUI, isEnabled, isVisible, readDesign, removeListener, removeStyleName, setCaption, setEnabled, setIcon, setId, setParent, setPrimaryStyleName, setStyleName, setVisible, writeDesign

Methods inherited from interface com.vaadin.server.ClientConnector

addAttachListener, addDetachListener, beforeClientResponse, detach, encodeState, getErrorHandler, getExtensions, getRpcManager, getStateType, handleConnectorRequest, isAttached, isConnectorEnabled, markAsDirtyRecursive, removeAttachListener, removeDetachListener, removeExtension, requestRepaint, requestRepaintAll, retrievePendingRpcCalls, setErrorHandler

Methods inherited from interface com.vaadin.shared.Connector

getConnectorId

Methods inherited from interface com.vaadin.server.Sizeable

getHeight, getHeightUnits, getWidth, getWidthUnits, setHeight, setHeight, setHeightUndefined, setSizeFull, setSizeUndefined, setWidth, setWidth, setWidthUndefined

Constructor Detail

Upload

public Upload()

Creates a new instance of Upload. The receiver must be set before performing an upload.

Upload

public Upload(String caption,
              Upload.Receiver uploadReceiver)

Method Detail

changeVariables

public void changeVariables(Object source,
                            Map<String,Object> variables)

Invoked when the value of a variable has changed.

Specified by:

changeVariables in interface VariableOwner

Parameters:

source - the Source of the variable change. This is the origin of the event. For example in Web Adapter this is the request.

variables - the Mapping from variable names to new variable values.

See Also:

VariableOwner.changeVariables(java.lang.Object, java.util.Map)

paintContent

public void paintContent(PaintTarget target)
                  throws PaintException

Paints the content of this component.

Specified by:

paintContent in interface LegacyComponent

Parameters:

target - Target to paint the content on.

Throws:

PaintException - if the paint operation failed.

addStartedListener

public Registration addStartedListener(Upload.StartedListener listener)

Adds the upload started event listener.

Parameters:

listener - the Listener to be added, not null

Since:

8.0

removeStartedListener

@Deprecated
public void removeStartedListener(Upload.StartedListener listener)

Deprecated.

Removes the upload started event listener.

Parameters:

listener - the Listener to be removed.

addFinishedListener

public Registration addFinishedListener(Upload.FinishedListener listener)

Adds the upload received event listener.

Parameters:

listener - the Listener to be added, not null

Since:

8.0

removeFinishedListener

@Deprecated
public void removeFinishedListener(Upload.FinishedListener listener)

Deprecated.

Removes the upload received event listener.

Parameters:

listener - the Listener to be removed.

addFailedListener

public Registration addFailedListener(Upload.FailedListener listener)

Adds the upload interrupted event listener.

Parameters:

listener - the Listener to be added, not null

Since:

8.0

removeFailedListener

@Deprecated
public void removeFailedListener(Upload.FailedListener listener)

Deprecated.

Removes the upload interrupted event listener.

Parameters:

listener - the Listener to be removed.

addSucceededListener

public Registration addSucceededListener(Upload.SucceededListener listener)

Adds the upload success event listener.

Parameters:

listener - the Listener to be added, not null

Since:

8.0

removeSucceededListener

@Deprecated
public void removeSucceededListener(Upload.SucceededListener listener)

Deprecated.

Removes the upload success event listener.

Parameters:

listener - the Listener to be removed.

addProgressListener

public Registration addProgressListener(Upload.ProgressListener listener)

Adds the upload progress event listener.

Parameters:

listener - the progress listener to be added

Since:

8.0

removeProgressListener

@Deprecated
public void removeProgressListener(Upload.ProgressListener listener)

Deprecated.

Removes the upload progress event listener.

Parameters:

listener - the progress listener to be removed

addChangeListener

public Registration addChangeListener(Upload.ChangeListener listener)

Adds a filename change event listener

Parameters:

listener - the Listener to add, not null

Since:

8.0

removeChangeListener

@Deprecated
public void removeChangeListener(Upload.ChangeListener listener)

Deprecated.

Removes a filename change event listener

Parameters:

listener - the listener to be removed

fireStarted

protected void fireStarted(String filename,
                           String MIMEType)

Emit upload received event.

Parameters:

filename -

MIMEType -

fireUploadInterrupted

protected void fireUploadInterrupted(String filename,
                                     String MIMEType,
                                     long length)

Emits the upload failed event.

Parameters:

filename -

MIMEType -

length -

fireNoInputStream

protected void fireNoInputStream(String filename,
                                 String MIMEType,
                                 long length)

fireNoOutputStream

protected void fireNoOutputStream(String filename,
                                  String MIMEType,
                                  long length)

fireUploadInterrupted

protected void fireUploadInterrupted(String filename,
                                     String MIMEType,
                                     long length,
                                     Exception e)

fireUploadSuccess

protected void fireUploadSuccess(String filename,
                                 String MIMEType,
                                 long length)

Emits the upload success event.

Parameters:

filename -

MIMEType -

length -

fireUpdateProgress

protected void fireUpdateProgress(long totalBytes,
                                  long contentLength)

Emits the progress event.

Parameters:

totalBytes - bytes received so far

contentLength - actual size of the file being uploaded, if known

getReceiver

public Upload.Receiver getReceiver()

Returns the current receiver.

Returns:

the StreamVariable.

setReceiver

public void setReceiver(Upload.Receiver receiver)

Sets the receiver.

Parameters:

receiver - the receiver to set.

focus

public void focus()

Sets the focus for this component if the component is Focusable.

Specified by:

focus in interface Component.Focusable

Overrides:

focus in class AbstractComponent

See Also:

FieldEvents, FieldEvents.FocusEvent, FieldEvents.FocusListener, FieldEvents.BlurEvent, FieldEvents.BlurListener

getTabIndex

public int getTabIndex()

Gets the Tabulator index of this Focusable component.

Specified by:

getTabIndex in interface Component.Focusable

Returns:

tab index set for the Focusable component

See Also:

Component.Focusable.getTabIndex()

setTabIndex

public void setTabIndex(int tabIndex)

Sets the Tabulator index of this Focusable component.

Specified by:

setTabIndex in interface Component.Focusable

Parameters:

tabIndex - the tab order of this component. Indexes usually start from 1. Zero means that default tab order should be used. A negative value means that the field should not be included in the tabbing sequence.

See Also:

Component.Focusable.setTabIndex(int)

startUpload

public void startUpload()

Go into upload state. This is to prevent double uploading on same component. Warning: this is an internal method used by the framework and should not be used by user of the Upload component. Using it results in the Upload component going in wrong state and not working. It is currently public because it is used by another class.

interruptUpload

public void interruptUpload()

Interrupts the upload currently being received. The interruption will be done by the receiving thread so this method will return immediately and the actual interrupt will happen a bit later.

isUploading

public boolean isUploading()

getBytesRead

public long getBytesRead()

Gets read bytes of the file currently being uploaded.

Returns:

bytes

getUploadSize

public long getUploadSize()

Returns size of file currently being uploaded. Value sane only during upload.

Returns:

size in bytes

getButtonCaption

public String getButtonCaption()

Returns:

String to be rendered into button that fires uploading

setButtonCaption

public void setButtonCaption(String buttonCaption)

In addition to the actual file chooser, upload components have button that starts actual upload progress. This method is used to set text in that button.

In case the button text is set to null, the button is hidden. In this case developer must explicitly initiate the upload process with submitUpload().

In case the Upload is used in immediate mode using setImmediateMode(boolean), the file choose (html input with type "file") is hidden and only the button with this text is shown.

Note the string given is set as is to the button. HTML formatting is not stripped. Be sure to properly validate your value according to your needs.

Parameters:

buttonCaption - text for upload components button.

submitUpload

public void submitUpload()

Forces the upload the send selected file to the server.

In case developer wants to use this feature, he/she will most probably want to hide the uploads internal submit button by setting its caption to null with setButtonCaption(String) method.

Note, that the upload runs asynchronous. Developer should use normal upload listeners to trac the process of upload. If the field is empty uploaded the file name will be empty string and file length 0 in the upload finished event.

Also note, that the developer should not remove or modify the upload in the same user transaction where the upload submit is requested. The upload may safely be hidden or removed once the upload started event is fired.

markAsDirty

public void markAsDirty()

Description copied from interface: ClientConnector

Marks that this connector's state might have changed. When the framework is about to send new data to the client-side, it will run ClientConnector.beforeClientResponse(boolean) followed by ClientConnector.encodeState() for all connectors that are marked as dirty and send any updated state info to the client.

Specified by:

markAsDirty in interface ClientConnector

Specified by:

markAsDirty in interface LegacyComponent

Overrides:

markAsDirty in class AbstractClientConnector

See Also:

ClientConnector.markAsDirty()

getStreamVariable

protected StreamVariable getStreamVariable()

getListeners

public Collection<?> getListeners(Class<?> eventType)

Description copied from class: AbstractClientConnector

Returns all listeners that are registered for the given event type or one of its subclasses.

Overrides:

getListeners in class AbstractClientConnector

Parameters:

eventType - The type of event to return listeners for.

Returns:

A collection with all registered listeners. Empty if no listeners are found.

setImmediateMode

public void setImmediateMode(boolean immediateMode)

Sets the immediate mode of the upload.

If the upload is in immediate mode, the file upload is started immediately after the user has selected the file.

If the upload is not in immediate mode, after selecting the file the user must click another button to start the upload.

The default mode of an Upload component is immediate.

Parameters:

immediateMode - true for immediate mode, false for not

Since:

8.0

isImmediateMode

public boolean isImmediateMode()

Returns the immediate mode of the upload.

The default mode of an Upload component is immediate.

Returns:

true if the upload is in immediate mode, false if the upload is not in immediate mode

Since:

8.0

See Also:

setImmediateMode(boolean)

getState

protected UploadState getState()

Description copied from class: AbstractComponent

Returns the shared state bean with information to be sent from the server to the client. Subclasses should override this method and set any relevant fields of the state returned by super.getState().

Overrides:

getState in class AbstractComponent

Returns:

updated component shared state

getState

protected UploadState getState(boolean markAsDirty)

Description copied from class: AbstractClientConnector

Returns the shared state for this connector.

Overrides:

getState in class AbstractComponent

Parameters:

markAsDirty - true if the connector should automatically be marked dirty, false otherwise

Returns:

The shared state for this connector. Never null.

See Also:

AbstractClientConnector.getState()