org.eclipse.birt.chart.device
Class DisplayAdapter

java.lang.Object
  org.eclipse.birt.chart.device.DisplayAdapter

All Implemented Interfaces:

IDisplayServer

public abstract class DisplayAdapter

extends java.lang.Object

implements IDisplayServer

A no-op adapter implementation for the IDisplayServerinterface definition.

Constructor Summary

DisplayAdapter()

Method Summary

java.lang.Object	createFont(FontDefinition fd) Attempts to create a new font resource associated with a specific device for use in rendering or computations
void	debug() Lists out all resources that were previously logged explicitly by the logCreation(Object) method or those internally created by each of the resource creation methods.
java.lang.Object	getColor(ColorDefinition cd) Attempts to create a new color resource associated with a specific device
int	getDpiResolution() Returns the resolution of the device in dots per inch As an example, for a display screen, the dots correspond to pixels and a typical value for a Win32 OS is 96 DPI.
java.util.Locale	getLocale() Provides the locale to display server implementations as needed to retrieve localized resources for presentation.
java.lang.Object	getObserver() An observer is typically associated with certain device types to aid in image loading and image metadata retrieval.
Size	getSize(java.lang.Object oImage) Returns the size(width, height) of the device specific image that was previously loaded by the loadImage(URL) method
ITextMetrics	getTextMetrics(Label la) An instance of a text metrics computation class capable of providing text metric information associated with a given Label to aid in typically computing the size of rendered text
com.ibm.icu.util.ULocale	getULocale() Provides the locale to display server implementations as needed to retrieve localized resources for presentation.
java.lang.Object	loadImage(java.net.URL url) Attempts to use device specific libraries to load an image for use with the device renderer
void	logCreation(java.lang.Object oMisc) Log creation of a resource for which leaks are to be tracked
void	setDpiResolution(int dpi) Sets the dpi resolution.
void	setLocale(com.ibm.icu.util.ULocale lcl) A convenience method provided to associate a locale with a display server

Methods inherited from class java.lang.Object

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

Constructor Detail

DisplayAdapter

public DisplayAdapter()

Method Detail

debug

public void debug()

Description copied from interface: IDisplayServer

Lists out all resources that were previously logged explicitly by the logCreation(Object) method or those internally created by each of the resource creation methods. Once this method is invoked, all entries written into the log should be flushed.

Specified by:

debug in interface IDisplayServer

logCreation

public void logCreation(java.lang.Object oMisc)

Description copied from interface: IDisplayServer

Log creation of a resource for which leaks are to be tracked

Specified by:

logCreation in interface IDisplayServer

Parameters:

oMisc - A device-specific object being created

createFont

public java.lang.Object createFont(FontDefinition fd)

Description copied from interface: IDisplayServer

Attempts to create a new font resource associated with a specific device for use in rendering or computations

Specified by:

createFont in interface IDisplayServer

Parameters:

fd - An font description for which a device specific resource is being requested

Returns:

A device specific font

getColor

public java.lang.Object getColor(ColorDefinition cd)

Description copied from interface: IDisplayServer

Attempts to create a new color resource associated with a specific device

Specified by:

getColor in interface IDisplayServer

Parameters:

cd - A color description for which a device specific resource is being requested

Returns:

A device specific color

getDpiResolution

public int getDpiResolution()

Description copied from interface: IDisplayServer

Returns the resolution of the device in dots per inch As an example, for a display screen, the dots correspond to pixels and a typical value for a Win32 OS is 96 DPI.

Specified by:

getDpiResolution in interface IDisplayServer

Returns:

The integral dots per inch associated with the device

setDpiResolution

public void setDpiResolution(int dpi)

Description copied from interface: IDisplayServer

Sets the dpi resolution. This defines how many dots per inch to use for rendering the chart. This is optional, the display server will compute the default dpi resolution of the display where the chart is rendered. It is mostly intended to be used for creating high resolution images.

Specified by:

setDpiResolution in interface IDisplayServer

Parameters:

dpi - The number of dots per inch

loadImage

public java.lang.Object loadImage(java.net.URL url)
                           throws ChartException

Description copied from interface: IDisplayServer

Attempts to use device specific libraries to load an image for use with the device renderer

Specified by:

loadImage in interface IDisplayServer

Parameters:

url - The URL associated with the image location

Returns:

An instance of an image associated with the specified URL

Throws:

ChartException

getSize

public Size getSize(java.lang.Object oImage)

Description copied from interface: IDisplayServer

Returns the size(width, height) of the device specific image that was previously loaded by the loadImage(URL) method

Specified by:

getSize in interface IDisplayServer

Parameters:

oImage - The image for which the size is being requested

Returns:

The size of the image

getObserver

public java.lang.Object getObserver()

Description copied from interface: IDisplayServer

An observer is typically associated with certain device types to aid in image loading and image metadata retrieval.

Specified by:

getObserver in interface IDisplayServer

Returns:

An image observer associated with a specific device renderer

getTextMetrics

public ITextMetrics getTextMetrics(Label la)

Description copied from interface: IDisplayServer

An instance of a text metrics computation class capable of providing text metric information associated with a given Label to aid in typically computing the size of rendered text

Specified by:

getTextMetrics in interface IDisplayServer

Parameters:

la - The Label instance for which text metrics are being requested

Returns:

Text metrics associated with the specified Label instance

getLocale

public final java.util.Locale getLocale()

Description copied from interface: IDisplayServer

Provides the locale to display server implementations as needed to retrieve localized resources for presentation.

Specified by:

getLocale in interface IDisplayServer

Returns:

locale

getULocale

public final com.ibm.icu.util.ULocale getULocale()

Description copied from interface: IDisplayServer

Provides the locale to display server implementations as needed to retrieve localized resources for presentation.

Specified by:

getULocale in interface IDisplayServer

Returns:

ulocale

setLocale

public final void setLocale(com.ibm.icu.util.ULocale lcl)

A convenience method provided to associate a locale with a display server

Parameters:

lcl - The locale to be set