context.arch.widget
Class WDisplay

java.lang.Object
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  +--context.arch.BaseObject
        |
        +--context.arch.widget.Widget
              |
              +--context.arch.widget.WDisplay

public class WDisplay

extends Widget

This class is a context widget that represents a display device. It currently doesn't provide any context but offers a single service DISPLAY_CHOICES, with a single function DISPLAY.

See Also:

Widget

Field Summary

static java.lang.String	CLASSNAME Name of widget
static int	DEFAULT_PORT Default port this widget runs on
java.lang.String	VERSION_NUMBER Widget version number

Fields inherited from class context.arch.widget.Widget

attributes, attributeTypes, callbacks, CLASS, CurrentOffset, DEFAULT_PORT, id, PUT_DATA, PUT_DATA_REPLY, QUERY, QUERY_ATTRIBUTES, QUERY_ATTRIBUTES_REPLY, QUERY_CALLBACKS, QUERY_CALLBACKS_REPLY, QUERY_REPLY, QUERY_SERVICES, QUERY_SERVICES_REPLY, QUERY_VERSION, QUERY_VERSION_REPLY, services, SPACER, storage, subscribers, TIMESTAMP, UPDATE, UPDATE_AND_QUERY, UPDATE_AND_QUERY_REPLY, VERSION, VERSION_NUMBER

Fields inherited from class context.arch.BaseObject

communications, EXIT_OK, handlers, ID, parser, PING, PING_REPLY, serviceHandlers

Constructor Summary

WDisplay(java.lang.String device, int port, java.lang.String width, java.lang.String height, java.lang.String graphics)
Constructor that creates the widget for the given device and monitors communications on the given port .

WDisplay(java.lang.String device, int port, java.lang.String width, java.lang.String height, java.lang.String graphics, boolean storageFlag)
Constructor that creates the widget for the given device and monitors communications on the given port .

WDisplay(java.lang.String device, int port, java.lang.String id, java.lang.String width, java.lang.String height, java.lang.String graphics)
Constructor that creates the widget for the given device and monitors communications on the given port It also sets the id of this widget to the given id.

WDisplay(java.lang.String device, int port, java.lang.String id, java.lang.String width, java.lang.String height, java.lang.String graphics, boolean storageFlag)
Constructor that creates the widget for the given device and monitors communications on the given port It also sets the id of this widget to the given id and sets storage functionality to storageFlag

WDisplay(java.lang.String device, java.lang.String width, java.lang.String height, java.lang.String graphics)
Constructor that creates the widget for the give device and monitors communications on the DEFAULT_PORT.

WDisplay(java.lang.String device, java.lang.String width, java.lang.String height, java.lang.String graphics, boolean storageFlag)
Constructor that creates the widget for the give device and monitors communications on the DEFAULT_PORT.

Method Summary

static void	main(java.lang.String[] argv) Temporary main method to create a widget with location and port specified by command line arguments
void	notify(java.lang.String event, java.lang.Object data) Called by the generator class when a significant event has occurred.
protected AttributeNameValues	queryGenerator() This method returns an empty AttributeNameValues object.
protected Attributes	setAttributes() This method implements the abstract method Widget.setAttributes().
protected Callbacks	setCallbacks() This method implements the abstract method Widget.setCallbacks().
protected Services	setServices() This method implements the abstract method Widget.setServices().

Methods inherited from class context.arch.widget.Widget

addSubscriber, canHandle, canHandle, canHandle, canHandle, executeService, getAttributeType, getCurrentTime, getNewOffset, getNewOffsetNoDelay, isAttribute, isCallback, processCallbackReply, putData, queryAttributes, queryCallbacks, queryServices, queryWidget, removeSubscriber, retrieveData, runUserMethod, runWidgetMethod, sendToSubscribers, setAttribute, store, store, updateWidgetInformation

Methods inherited from class context.arch.BaseObject

askInterpreter, decodeData, encodeData, executeAsynchronousWidgetService, executeSynchronousWidgetService, getHostAddress, getId, getVersion, getVersion, getWidgetAttributes, getWidgetCallbacks, getWidgetServices, pingComponent, pollWidget, putDataInWidget, queryVersion, quit, retrieveDataFrom, retrieveDataFrom, retrieveDataFrom, retrieveDataFrom, retrieveDataFrom, retrieveDataFrom, retrieveDataFrom, returnPing, runComponentMethod, runMethod, serviceResult, setId, setVersion, subscribeTo, subscribeTo, subscribeTo, subscribeTo, unsubscribeFrom, updateAndPollWidget, userCallback, userRequest, userRequest, userRequest

Methods inherited from class java.lang.Object

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

Field Detail

VERSION_NUMBER

public java.lang.String VERSION_NUMBER

Widget version number

CLASSNAME

public static final java.lang.String CLASSNAME

Name of widget

DEFAULT_PORT

public static final int DEFAULT_PORT

Default port this widget runs on

Constructor Detail

WDisplay

public WDisplay(java.lang.String device,
                java.lang.String width,
                java.lang.String height,
                java.lang.String graphics)

Constructor that creates the widget for the give device and monitors communications on the DEFAULT_PORT. It also sets the id of this widget to CLASSNAME_ and uses storage functionality.

Parameters:

device - Tag for the display device

width - Width of the display in pixels

height - Height of the display in pixels

graphics - Type of display: text or graphics

WDisplay

public WDisplay(java.lang.String device,
                java.lang.String width,
                java.lang.String height,
                java.lang.String graphics,
                boolean storageFlag)

Constructor that creates the widget for the give device and monitors communications on the DEFAULT_PORT. It also sets the id of this widget to CLASSNAME_ and sets storage functionality to storageFlag.

Parameters:

device - Tag for the display device

width - Width of the display in pixels

height - Height of the display in pixels

graphics - Type of display: text or graphics

storageFlag - Flag to indicate whether or not to use storage

WDisplay

public WDisplay(java.lang.String device,
                int port,
                java.lang.String width,
                java.lang.String height,
                java.lang.String graphics)

Constructor that creates the widget for the given device and monitors communications on the given port . It also sets the id of this widget to CLASSNAME_ and uses storage functionality.

Parameters:

device - Tag for the display device

port - Port to run the widget on

width - Width of the display in pixels

height - Height of the display in pixels

graphics - Type of display: text or graphics

WDisplay

public WDisplay(java.lang.String device,
                int port,
                java.lang.String width,
                java.lang.String height,
                java.lang.String graphics,
                boolean storageFlag)

Constructor that creates the widget for the given device and monitors communications on the given port . It also sets the id of this widget to CLASSNAME_ and sets storage functionality to storageFlag.

Parameters:

device - Tag for the display device

port - Port to run the widget on

width - Width of the display in pixels

height - Height of the display in pixels

graphics - Type of display: text or graphics

storageFlag - Flag to indicate whether or not to use storage.

WDisplay

public WDisplay(java.lang.String device,
                int port,
                java.lang.String id,
                java.lang.String width,
                java.lang.String height,
                java.lang.String graphics)

Constructor that creates the widget for the given device and monitors communications on the given port It also sets the id of this widget to the given id.

Parameters:

device - Tag for the display device

port - Port to run the widget on

id - Widget id

width - Width of the display in pixels

height - Height of the display in pixels

graphics - Type of display: text or graphics

WDisplay

public WDisplay(java.lang.String device,
                int port,
                java.lang.String id,
                java.lang.String width,
                java.lang.String height,
                java.lang.String graphics,
                boolean storageFlag)

Constructor that creates the widget for the given device and monitors communications on the given port It also sets the id of this widget to the given id and sets storage functionality to storageFlag

Parameters:

device - Tag for the display device

port - Port to run the widget on

id - Widget id

width - Width of the display in pixels

height - Height of the display in pixels

graphics - Type of display: text or graphics

storageFlag - Flag to indicate whether or not to use storage

Method Detail

setAttributes

protected Attributes setAttributes()

This method implements the abstract method Widget.setAttributes(). It defines the attributes as HEIGHT, WIDTH, and GRAPHICS.

Overrides:

setAttributes in class Widget

Returns:

the Attributes used by this widget

setCallbacks

protected Callbacks setCallbacks()

This method implements the abstract method Widget.setCallbacks(). This has no callbacks.

Overrides:

setCallbacks in class Widget

Returns:

the Callbacks used by this widget

setServices

protected Services setServices()

This method implements the abstract method Widget.setServices(). It has a single service: DISPLAY_CHOICES

Overrides:

setServices in class Widget

Returns:

the Services provided by this widget

See Also:

DisplayChoiceService

queryGenerator

protected AttributeNameValues queryGenerator()

This method returns an empty AttributeNameValues object.

Overrides:

queryGenerator in class Widget

Returns:

empty AttributeNameValues

notify

public void notify(java.lang.String event,
                   java.lang.Object data)

Called by the generator class when a significant event has occurred. It creates a frame to collect data from the registrant.

Overrides:

notify in class Widget

Parameters:

event - Name of the event that has occurred

data - Object containing relevant event data

See Also:

Widget.sendToSubscribers(String, AttributeNameValues), Widget.store(AttributeNameValues)

main

public static void main(java.lang.String[] argv)

Temporary main method to create a widget with location and port specified by command line arguments