org.gvsig.raster.impl.buffer

Class DefaultRasterQuery

java.lang.Object

org.gvsig.raster.impl.buffer.DefaultRasterQuery

All Implemented Interfaces:

RasterQuery, DataQuery, SpiRasterQuery, Persistent

public class DefaultRasterQuery
extends java.lang.Object
implements RasterQuery, SpiRasterQuery

Default implementation for RasterQuery

Field Summary

Fields

Modifier and Type	Field and Description
static int	TYPE_ENTIRE
static int	TYPE_ONE_TILE
static int	TYPE_PX
static int	TYPE_PX_RESCALED
static int	TYPE_PX_RESCALED_SHIFT
static int	TYPE_PX_SHIFT
static int	TYPE_TILED
static int	TYPE_UNDEFINED
static int	TYPE_WCOORDS
static int	TYPE_WCOORDS_RESCALED
static int	TYPE_WCOORDS_SHIFT

Constructor Summary

Constructors

Constructor and Description
DefaultRasterQuery()

Method Summary

Modifier and Type	Method and Description
BandList	buildDrawableBandList(BandList storeBandList) Builds a list o bands to draw from the store band list and the drawablebands asigned by the user
void	calculateParameters(RasterDataStore store) Calculates the parameters using the base request.
RasterQuery	clone() Clones this RasterQuery
Buffer	createBuffer(RasterDataStore store)
void	dontBuildBuffer() The buffer won't be built internally when all parameters will be calculated.
void	forceARGBRequest() Force that the built of the buffer be ARGB.
void	forceRGBRequest() Force that the built of the buffer be RGB.
int	getAdjustedBufHeight()
int	getAdjustedBufWidth()
int	getAdjustedHeight()
Extent	getAdjustedRequestBoundingBox() Gets a bounding box of a request in world coordinates adjusted to the bounding box of the source.
java.awt.Rectangle	getAdjustedRequestPxWindow() Gets the adjusted window of the request in pixel coordinates
int	getAdjustedWidth()
int	getAdjustedX()
int	getAdjustedY()
int	getAlphaBandNumber()
BandList	getBandList()
Buffer	getBufferForProviders() Buffer loaded by the provider and created by the store
int	getBufHeight()
int	getBufWidth()
CacheStruct	getCacheStruct()
int[]	getDrawableBands() Gets the list of bands to write in a buffer when the call query be executed.
int	getHeight()
NoData	getNoDataValueToFill()
java.lang.Object	getQueryParameter(java.lang.String name) Returns the value of an query parameter.
Extent	getRequestBoundingBox() Gets a bounding box of a request in world coordinates.
java.awt.Rectangle	getRequestPxWindow() Gets the window of the request in pixel coordinates
int	getResolutionLevel()
double	getScale() Returns the scale of the data to load.
double[]	getStep() Giving a world coordinates, a buffer size and a original raster size.
TaskStatus	getTaskStatus() Gets the task status
int	getTileCol()
TileListener	getTileListener()
int	getTileRow()
Time	getTime() Gets the time information of the viewport requested
int	getType()
int	getWidth()
int	getX()
int	getY()
boolean	isAdjustToExtent() Obtiene el flag que ajusta el extent de la petición al del raster.
boolean	isforcingARGBRequest()
boolean	isforcingRGBRequest()
boolean	isMemoryBuffer() Obtiene el flag que dice si la carga del siguiente buffer es en memoria
boolean	isReadOnly() Returns true if the buffer is not writable
boolean	isStoredLastBuffer() The user can told if the buffer will be stored or not in the RasterDatasource.
boolean	isSupersamplingOptionActive() Returns true if the supersampling is enable and false if it is disable Rendering from gvSIG, the resampling is always disable because if the request is greater than 1:1 scale the resampling will be done in the client Render.
boolean	isSupersamplingTheRequest() Returns true if the request is trying apply supersampling, that is, the size of the result is bigger that the window of maximum resolution of this source
void	loadFromState(PersistentState state) Set the state of the object from the state passed as parameter.
boolean	requestHasShift()
boolean	requestIsInWorldCoordinates()
boolean	requestIsPixelCoordinates()
boolean	requestIsRescaled()
boolean	requestIsTiled()
void	saveToState(PersistentState state) Saves the internal state of the object on the provided PersistentState object.
void	setAdjustedBufHeight(int h)
void	setAdjustedBufWidth(int w)
void	setAdjustedHeight(int h)
void	setAdjustedRequestBoundingBox(Extent adjustedBoundingBox) Sets a bounding box of a request in world coordinates adjusted to the bounding box of the source.
void	setAdjustedWidth(int w)
void	setAdjustedX(int x)
void	setAdjustedY(int y)
void	setAdjustToExtent(boolean adjustToExtent) Asigna el flag que ajusta el extent de la petición al del raster.
void	setAllDrawableBands() Gets a buffer of data with the same number of bands and the same order that the original raster
void	setAlphaBand(int bandNumber) Sets the number of the alpha band.
void	setAreaOfInterest()
void	setAreaOfInterest(Extent boundingBox)
void	setAreaOfInterest(Extent requestBoundingBox, int bufWidth, int bufHeight)
void	setAreaOfInterest(Extent requestBoundingBox, int bufWidth, int bufHeight, TileListener listener)
void	setAreaOfInterest(java.awt.Rectangle pixelWindow)
void	setAreaOfInterest(java.awt.Rectangle pixelWindow, int bufWidth, int bufHeight)
void	setBandList(BandList bandList)
void	setBufferForProviders(Buffer buffer) Buffer loaded by the provider.
void	setBufferResult(Buffer buffer) The buffer is always built by the DataStore but in some cases it's necessary assign the result because the buffer has changed.
void	setBufHeight(int h)
void	setBufWidth(int w)
void	setCacheStruct(CacheStruct cacheStruct)
void	setDrawableBands(int[] drawableBands) Set the list of bands to write in a buffer when the call query be executed.
void	setHeight(int h)
void	setMemoryBuffer(boolean memoryBuffer) Asigna el flag que dice si la carga del siguiente buffer es en memoria
void	setNoDataToFill(NoData noData) Asigna el valor noData con el que se rellenan las celdas cuando se hace una petición en la que no se quiere que se ajuste al �rea del raster.
void	setQueryParameter(java.lang.String name, java.lang.Object value) Sets the value of an query parameter.
void	setReadOnly(boolean readOnly) Asigna el flag que dice si la carga del siguiente buffer es de solo lectura o lectura/escritura.
void	setRequestBoundingBox(Extent requestBoundingBox) Sets a bounding box of a request in world coordinates.
void	setRequestPixelWindow(java.awt.Rectangle pixelWindow)
void	setScale(double scale) Sets the scale.
void	setSupersamplingOption(boolean supersamplingLoadingBuffer) Enables or disables the supersampling loading the buffer.
void	setTaskStatus(TaskStatus taskStatus) Sets the task status
void	setTileListener(TileListener listener)
void	setTileParameters(int level, int tileCol, int tileRow)
void	setTileParameters(int level, int tileCol, int tileRow, Extent bbox, CacheStruct cacheStruct) Deprecated. Use setTileParameters(int level, int tileCol, int tileRow)
void	setTime(Time time) Sets the time information of the viewport requested
void	setWidth(int w)
void	setX(int x)
void	setY(int y)
void	storeLastBuffer(boolean store) The user can told if the buffer will be stored or not in the RasterDatasource.

Methods inherited from class java.lang.Object

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

Field Detail

TYPE_UNDEFINED

public static final int TYPE_UNDEFINED

See Also:

Constant Field Values

TYPE_ENTIRE

public static final int TYPE_ENTIRE

See Also:

Constant Field Values

TYPE_WCOORDS

public static final int TYPE_WCOORDS

See Also:

Constant Field Values

TYPE_WCOORDS_RESCALED

public static final int TYPE_WCOORDS_RESCALED

See Also:

Constant Field Values

TYPE_WCOORDS_SHIFT

public static final int TYPE_WCOORDS_SHIFT

See Also:

Constant Field Values

TYPE_PX

public static final int TYPE_PX

See Also:

Constant Field Values

TYPE_PX_RESCALED

public static final int TYPE_PX_RESCALED

See Also:

Constant Field Values

TYPE_PX_SHIFT

public static final int TYPE_PX_SHIFT

See Also:

Constant Field Values

TYPE_PX_RESCALED_SHIFT

public static final int TYPE_PX_RESCALED_SHIFT

See Also:

Constant Field Values

TYPE_TILED

public static final int TYPE_TILED

See Also:

Constant Field Values

TYPE_ONE_TILE

public static final int TYPE_ONE_TILE

See Also:

Constant Field Values

Constructor Detail

DefaultRasterQuery

public DefaultRasterQuery()

Method Detail

setAreaOfInterest

public void setAreaOfInterest()

Specified by:

setAreaOfInterest in interface RasterQuery

setAreaOfInterest

public void setAreaOfInterest(java.awt.Rectangle pixelWindow)

Specified by:

setAreaOfInterest in interface RasterQuery

setAreaOfInterest

public void setAreaOfInterest(java.awt.Rectangle pixelWindow,
                              int bufWidth,
                              int bufHeight)

Specified by:

setAreaOfInterest in interface RasterQuery

setAreaOfInterest

public void setAreaOfInterest(Extent requestBoundingBox,
                              int bufWidth,
                              int bufHeight)

Specified by:

setAreaOfInterest in interface RasterQuery

setAreaOfInterest

public void setAreaOfInterest(Extent boundingBox)

Specified by:

setAreaOfInterest in interface RasterQuery

setAreaOfInterest

public void setAreaOfInterest(Extent requestBoundingBox,
                              int bufWidth,
                              int bufHeight,
                              TileListener listener)

Specified by:

setAreaOfInterest in interface RasterQuery

setTileParameters

public void setTileParameters(int level,
                              int tileCol,
                              int tileRow)

Specified by:

setTileParameters in interface RasterQuery

setTileParameters

public void setTileParameters(int level,
                              int tileCol,
                              int tileRow,
                              Extent bbox,
                              CacheStruct cacheStruct)

Deprecated. Use setTileParameters(int level, int tileCol, int tileRow)

Description copied from interface: RasterQuery

Parameters to make a tile request.

Specified by:

setTileParameters in interface RasterQuery

Parameters:

level - Resolution level

tileCol - Tile column in the matrix of its level

tileRow - Tile row in the matrix of its level

bbox - Bounding box of the requested tile

cacheStruct - Cache structure force by the client

requestIsTiled

public boolean requestIsTiled()

Specified by:

requestIsTiled in interface SpiRasterQuery

requestHasShift

public boolean requestHasShift()

requestIsPixelCoordinates

public boolean requestIsPixelCoordinates()

Specified by:

requestIsPixelCoordinates in interface SpiRasterQuery

requestIsInWorldCoordinates

public boolean requestIsInWorldCoordinates()

Specified by:

requestIsInWorldCoordinates in interface SpiRasterQuery

requestIsRescaled

public boolean requestIsRescaled()

isSupersamplingTheRequest

public boolean isSupersamplingTheRequest()

Returns true if the request is trying apply supersampling, that is, the size of the result is bigger that the window of maximum resolution of this source

Returns:

clone

public RasterQuery clone()

Description copied from interface: RasterQuery

Clones this RasterQuery

Specified by:

clone in interface RasterQuery

Specified by:

clone in interface SpiRasterQuery

Overrides:

clone in class java.lang.Object

calculateParameters

public void calculateParameters(RasterDataStore store)
                         throws QueryException

Calculates the parameters using the base request. That is, bounding boxes, data windows, output size, steps and parameters for supersampling, band lists and buffers. This parameters are calculated adjusting to the source limits. For this reason, the request parameters are saved in other variables, to allow calculate the displacement and resampling whether it was necessary

Parameters:

store -

Throws:

QueryException

createBuffer

public Buffer createBuffer(RasterDataStore store)
                    throws QueryException

Specified by:

createBuffer in interface SpiRasterQuery

Throws:

QueryException

buildDrawableBandList

public BandList buildDrawableBandList(BandList storeBandList)

Builds a list o bands to draw from the store band list and the drawablebands asigned by the user

Parameters:

drawableBands -

storeBandList -

Returns:

getQueryParameter

public java.lang.Object getQueryParameter(java.lang.String name)

Description copied from interface: DataQuery

Returns the value of an query parameter.

Specified by:

getQueryParameter in interface DataQuery

Parameters:

name - of the parameter

Returns:

the parameter value

getScale

public double getScale()

Description copied from interface: DataQuery

Returns the scale of the data to load.

Specified by:

getScale in interface DataQuery

Returns:

the scale of the data to load

setQueryParameter

public void setQueryParameter(java.lang.String name,
                              java.lang.Object value)

Description copied from interface: DataQuery

Sets the value of an query parameter.

Specified by:

setQueryParameter in interface DataQuery

Parameters:

name - of the query parameter

value - for the query parameter

setScale

public void setScale(double scale)

Description copied from interface: DataQuery

Sets the scale.

Specified by:

setScale in interface DataQuery

Parameters:

scale - the scale to set

loadFromState

public void loadFromState(PersistentState state)
                   throws PersistenceException

Description copied from interface: Persistent

Set the state of the object from the state passed as parameter.

Specified by:

loadFromState in interface Persistent

Throws:

PersistenceException

saveToState

public void saveToState(PersistentState state)
                 throws PersistenceException

Description copied from interface: Persistent

Saves the internal state of the object on the provided PersistentState object.

Specified by:

saveToState in interface Persistent

Throws:

PersistenceException

forceARGBRequest

public void forceARGBRequest()

Description copied from interface: RasterQuery

Force that the built of the buffer be ARGB. Be careful with the renderBands. It will have four bands as maximum.

Specified by:

forceARGBRequest in interface RasterQuery

forceRGBRequest

public void forceRGBRequest()

Description copied from interface: RasterQuery

Force that the built of the buffer be RGB. Be careful with the renderBands. It will have three bands as maximum.

Specified by:

forceRGBRequest in interface RasterQuery

isforcingRGBRequest

public boolean isforcingRGBRequest()

Specified by:

isforcingRGBRequest in interface RasterQuery

isforcingARGBRequest

public boolean isforcingARGBRequest()

Specified by:

isforcingARGBRequest in interface RasterQuery

dontBuildBuffer

public void dontBuildBuffer()

Description copied from interface: SpiRasterQuery

The buffer won't be built internally when all parameters will be calculated. Uses this call carefully. The provider must know that getBufferForProviders will return null.

Specified by:

dontBuildBuffer in interface SpiRasterQuery

getType

public int getType()

Specified by:

getType in interface SpiRasterQuery

storeLastBuffer

public void storeLastBuffer(boolean store)

Description copied from interface: RasterQuery

The user can told if the buffer will be stored or not in the RasterDatasource.

Specified by:

storeLastBuffer in interface RasterQuery

isStoredLastBuffer

public boolean isStoredLastBuffer()

The user can told if the buffer will be stored or not in the RasterDatasource.

Returns:

store

setAdjustToExtent

public void setAdjustToExtent(boolean adjustToExtent)

Description copied from interface: RasterQuery

Asigna el flag que ajusta el extent de la petición al del raster. Si está a true en caso de que el extent de la petición sea mayor lo ajustará a los limites de este. Si está a false no lo ajustará rellenando los valores con NoData

Specified by:

setAdjustToExtent in interface RasterQuery

Parameters:

adjustToExtent - true para ajustar y false si no queremos que lo haga. Por defecto estará a true.

isAdjustToExtent

public boolean isAdjustToExtent()

Description copied from interface: RasterQuery

Obtiene el flag que ajusta el extent de la petición al del raster. Si está a true en caso de que el extent de la petición sea mayor lo ajustará a los limites de este. Si está a false no lo ajustará rellenando los valores con NoData. Por defecto estará a true.

Specified by:

isAdjustToExtent in interface RasterQuery

Returns:

true si ajusta y false si no lo hace

getDrawableBands

public int[] getDrawableBands()

Description copied from interface: RasterQuery

Gets the list of bands to write in a buffer when the call query be executed. Each position in the array represents a buffer band and the number inside of this position is the image band read which be write in the buffer

Specified by:

getDrawableBands in interface RasterQuery

Specified by:

getDrawableBands in interface SpiRasterQuery

Returns:

Array with the list of bands

setAllDrawableBands

public void setAllDrawableBands()

Description copied from interface: RasterQuery

Gets a buffer of data with the same number of bands and the same order that the original raster

Specified by:

setAllDrawableBands in interface RasterQuery

setDrawableBands

public void setDrawableBands(int[] drawableBands)

Description copied from interface: RasterQuery

Set the list of bands to write in a buffer when the call query be executed. Each position in the array represents a buffer band and the number inside of this position is the image band read which be write in the buffer

Specified by:

setDrawableBands in interface RasterQuery

Parameters:

drawableBands - Array with the list of bands to write

setReadOnly

public void setReadOnly(boolean readOnly)

Description copied from interface: RasterQuery

Asigna el flag que dice si la carga del siguiente buffer es de solo lectura o lectura/escritura. La asignación del flag de solo lectura a true debe hacerse para cada consulta.

Specified by:

setReadOnly in interface RasterQuery

Parameters:

readOnly - true si la siguiente carga de buffer se hace de solo lectura y false si es de lectura/escritura

isSupersamplingOptionActive

public boolean isSupersamplingOptionActive()

Returns true if the supersampling is enable and false if it is disable Rendering from gvSIG, the resampling is always disable because if the request is greater than 1:1 scale the resampling will be done in the client Render. The default value is disable.

Specified by:

isSupersamplingOptionActive in interface RasterQuery

Specified by:

isSupersamplingOptionActive in interface SpiRasterQuery

Returns:

true si el supersampleo en la carga del buffer está activado y false si no lo está.

setSupersamplingOption

public void setSupersamplingOption(boolean supersamplingLoadingBuffer)

Enables or disables the supersampling loading the buffer. Rendering from gvSIG, the resampling is always disable because if the request is greater than 1:1 scale the resampling will be done in the client Render

Specified by:

setSupersamplingOption in interface RasterQuery

Parameters:

supersamplingLoadingBuffer - true o false para activar o desactivar el supersampling en la carga del buffer.

setMemoryBuffer

public void setMemoryBuffer(boolean memoryBuffer)

Description copied from interface: RasterQuery

Asigna el flag que dice si la carga del siguiente buffer es en memoria

Specified by:

setMemoryBuffer in interface RasterQuery

isMemoryBuffer

public boolean isMemoryBuffer()

Obtiene el flag que dice si la carga del siguiente buffer es en memoria

Returns:

memory true si la siguiente carga de buffer se hace en memoria y false se deja decidir al dataset el tipo de buffer

setNoDataToFill

public void setNoDataToFill(NoData noData)

Description copied from interface: RasterQuery

Asigna el valor noData con el que se rellenan las celdas cuando se hace una petición en la que no se quiere que se ajuste al �rea del raster. Por defecto noData tendrá el valor que aparece en IBuffer.

Specified by:

setNoDataToFill in interface RasterQuery

setAlphaBand

public void setAlphaBand(int bandNumber)

Description copied from interface: RasterQuery

Sets the number of the alpha band. This parameter is take into account only when the request is made using TileListener. In this case the parameter transparencyBuffer in nextBuffer method will have the right data.

Specified by:

setAlphaBand in interface RasterQuery

getAlphaBandNumber

public int getAlphaBandNumber()

Specified by:

getAlphaBandNumber in interface SpiRasterQuery

getNoDataValueToFill

public NoData getNoDataValueToFill()

Specified by:

getNoDataValueToFill in interface SpiRasterQuery

setRequestPixelWindow

public void setRequestPixelWindow(java.awt.Rectangle pixelWindow)

getX

public int getX()

getY

public int getY()

getWidth

public int getWidth()

getHeight

public int getHeight()

setX

public void setX(int x)

setY

public void setY(int y)

setWidth

public void setWidth(int w)

setHeight

public void setHeight(int h)

getAdjustedX

public int getAdjustedX()

Specified by:

getAdjustedX in interface SpiRasterQuery

getAdjustedY

public int getAdjustedY()

Specified by:

getAdjustedY in interface SpiRasterQuery

getAdjustedWidth

public int getAdjustedWidth()

Specified by:

getAdjustedWidth in interface SpiRasterQuery

getAdjustedHeight

public int getAdjustedHeight()

Specified by:

getAdjustedHeight in interface SpiRasterQuery

setAdjustedX

public void setAdjustedX(int x)

setAdjustedY

public void setAdjustedY(int y)

setAdjustedWidth

public void setAdjustedWidth(int w)

setAdjustedHeight

public void setAdjustedHeight(int h)

getRequestPxWindow

public java.awt.Rectangle getRequestPxWindow()

Gets the window of the request in pixel coordinates

Specified by:

getRequestPxWindow in interface SpiRasterQuery

getAdjustedRequestPxWindow

public java.awt.Rectangle getAdjustedRequestPxWindow()

Gets the adjusted window of the request in pixel coordinates

Specified by:

getAdjustedRequestPxWindow in interface SpiRasterQuery

getRequestBoundingBox

public Extent getRequestBoundingBox()

Gets a bounding box of a request in world coordinates.

Specified by:

getRequestBoundingBox in interface SpiRasterQuery

setRequestBoundingBox

public void setRequestBoundingBox(Extent requestBoundingBox)

Sets a bounding box of a request in world coordinates.

Parameters:

requestBoundingBox -

getAdjustedRequestBoundingBox

public Extent getAdjustedRequestBoundingBox()

Gets a bounding box of a request in world coordinates adjusted to the bounding box of the source.

Specified by:

getAdjustedRequestBoundingBox in interface SpiRasterQuery

setAdjustedRequestBoundingBox

public void setAdjustedRequestBoundingBox(Extent adjustedBoundingBox)

Sets a bounding box of a request in world coordinates adjusted to the bounding box of the source.

Parameters:

requestBoundingBox -

getBufWidth

public int getBufWidth()

Specified by:

getBufWidth in interface SpiRasterQuery

getBufHeight

public int getBufHeight()

Specified by:

getBufHeight in interface SpiRasterQuery

setBufHeight

public void setBufHeight(int h)

setBufWidth

public void setBufWidth(int w)

getAdjustedBufWidth

public int getAdjustedBufWidth()

Specified by:

getAdjustedBufWidth in interface SpiRasterQuery

getAdjustedBufHeight

public int getAdjustedBufHeight()

Specified by:

getAdjustedBufHeight in interface SpiRasterQuery

setAdjustedBufHeight

public void setAdjustedBufHeight(int h)

setAdjustedBufWidth

public void setAdjustedBufWidth(int w)

isReadOnly

public boolean isReadOnly()

Description copied from interface: RasterQuery

Returns true if the buffer is not writable

Specified by:

isReadOnly in interface RasterQuery

Returns:

getTileListener

public TileListener getTileListener()

Specified by:

getTileListener in interface SpiRasterQuery

setTileListener

public void setTileListener(TileListener listener)

getTime

public Time getTime()

Description copied from interface: RasterQuery

Gets the time information of the viewport requested

Specified by:

getTime in interface RasterQuery

Specified by:

getTime in interface SpiRasterQuery

setTime

public void setTime(Time time)

Description copied from interface: RasterQuery

Sets the time information of the viewport requested

Specified by:

setTime in interface RasterQuery

getTileRow

public int getTileRow()

Specified by:

getTileRow in interface SpiRasterQuery

getTileCol

public int getTileCol()

Specified by:

getTileCol in interface SpiRasterQuery

getCacheStruct

public CacheStruct getCacheStruct()

Specified by:

getCacheStruct in interface SpiRasterQuery

setCacheStruct

public void setCacheStruct(CacheStruct cacheStruct)

Specified by:

setCacheStruct in interface SpiRasterQuery

getResolutionLevel

public int getResolutionLevel()

Specified by:

getResolutionLevel in interface SpiRasterQuery

setTaskStatus

public void setTaskStatus(TaskStatus taskStatus)

Description copied from interface: RasterQuery

Sets the task status

Specified by:

setTaskStatus in interface RasterQuery

getBandList

public BandList getBandList()

Specified by:

getBandList in interface SpiRasterQuery

setBandList

public void setBandList(BandList bandList)

Specified by:

setBandList in interface SpiRasterQuery

getBufferForProviders

public Buffer getBufferForProviders()

Buffer loaded by the provider and created by the store

Specified by:

getBufferForProviders in interface SpiRasterQuery

Returns:

setBufferResult

public void setBufferResult(Buffer buffer)

Description copied from interface: SpiRasterQuery

The buffer is always built by the DataStore but in some cases it's necessary assign the result because the buffer has changed. In any case, It's advisable not to do it because the buffer for providers is replaced and next uses of this query would return an error.

Specified by:

setBufferResult in interface SpiRasterQuery

setBufferForProviders

public void setBufferForProviders(Buffer buffer)
                           throws QueryException

Description copied from interface: RasterQuery

Buffer loaded by the provider. This buffer is created by the RasterQuery but in some cases can be useful to pass the buffer already created by parameter. In any case, is advisable not to do it.

Specified by:

setBufferForProviders in interface RasterQuery

Throws:

QueryException

getStep

public double[] getStep()

Description copied from interface: RasterQuery

Giving a world coordinates, a buffer size and a original raster size. If the buffer is bigger than the window requested in the source raster (supersampling), then it means that each pixel of the raster will be written several times in the destination buffer. This function calculates the shift in pixels en X and Y coordinate that correspond with the first pixel, due to this pixel won't be drawn entirely. Dado unas coordenadas reales, un tamaño de buffer y un tamaño de raster. Si el buffer es de mayor tamaño que el raster (supersampleo) quiere decir que por cada pixel de buffer se repiten varios del raster. Esta función calcula el número de pixels de desplazamiento en X e Y que corresponden al primer pixel del buffer en la esquina superior izquierda. Esto es necesario porque la coordenada solicitada es real y puede no caer sobre un pixel completo. Este calculo es util cuando un cliente quiere supersamplear sobre un buffer y que no se lo haga el driver automáticamente.

Specified by:

getStep in interface RasterQuery

getTaskStatus

public TaskStatus getTaskStatus()

Gets the task status

Specified by:

getTaskStatus in interface SpiRasterQuery