ilog.views.maps.format.cadrg

Class IlvCADRGFrameReader

java.lang.Object

ilog.views.maps.format.cadrg.IlvCADRGFrameReader

All Implemented Interfaces:

IlvMapFeatureIterator

public class IlvCADRGFrameReader
extends Object
implements IlvMapFeatureIterator

This class is used to read CADGR frames. A frame is a file that constitutes the basic entity of the CADRG format. Frame files can be found in the coverage directories that are below the root directory of a CADRG product.

The geometries returned by the IlvCADRGFrameReader are instances of the class IlvMapImage. Usually, a CADRG Frame contains 36 subframes. Each subframe is translated into an IlvMapFeature.

Since:

Perforce JViews 3.0

See Also:

IlvCADRGFrame, IlvCADRGTocReader

Constructor Summary

Constructors

Constructor and Description
IlvCADRGFrameReader(DataInput dataInput, boolean transparency) Creates an instance of a CADRG frame reader from a dataInput opened on a CADRG Frame.
IlvCADRGFrameReader(String fileName, boolean transparency) Creates an instance of a CADRG frame reader for the specified frame file.
IlvCADRGFrameReader(URL url, boolean transparency) Creates an instance of a CADRG frame reader for the specified URL.

Method Summary

Modifier and Type	Method and Description
void	dispose() Releases the resources allocated by the reader.
void	finalize() Is called by the Java Garbage Collector to release the resources allocated to the reader.
ColorModel	getColorModel() Returns the color model to use for this frame.
IlvCoordinateSystem	getCoordinateSystem() Returns the spatial reference system that describes the coordinate system of geometric coordinates of the map features.
IlvFeatureRenderer	getDefaultFeatureRenderer() Returns the default renderer for this reader.
IlvCoordinate	getLowerRightCorner() Returns the coordinates of the lower-right corner of the frame in longitude and latitude expressed in the reader's projection.
IlvCoordinate	getLowerRightCorner(int subFrameIndex) Returns the lower right coordinate of one of the 36 sub frames.
IlvMapFeature	getNextFeature() Returns the next feature read.
IlvCoordinate	getUpperLeftCorner() Returns the coordinates of the upper-left corner of the frame in longitude and latitude expressed in the readers' projection.
IlvCoordinate	getUpperLeftCorner(int subFrameIndex) Returns the upper left coordinate of one of the 36 sub frames.
boolean	isGeoreferenced() Returns false if the frame is an overview or a frame containing legends.
boolean	isSubFrameValid(int subFrame) Returns true if the sub frame is defined in the CADRG frame.
byte[]	readNextSubFrameRaster() Reads the next available buffer in the CADRG Frame file.

Methods inherited from class java.lang.Object

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

Constructor Detail

IlvCADRGFrameReader

public IlvCADRGFrameReader(String fileName,
                           boolean transparency)
                    throws FileNotFoundException,
                           IOException,
                           IlvMapFormatException

Creates an instance of a CADRG frame reader for the specified frame file.

Parameters:

fileName - The name of the CADRG frame file

transparency - If true, the transparent pixels of the CADRG frame are displayed as transparent; otherwise, they appear black.

Throws:

FileNotFoundException - if the file does not exist.

IOException - if an IO error occurs.

IlvMapFormatException

IlvCADRGFrameReader

public IlvCADRGFrameReader(URL url,
                           boolean transparency)
                    throws IOException,
                           IlvMapFormatException

Creates an instance of a CADRG frame reader for the specified URL.

Parameters:

url - The URL of the CADRG frame file

transparency - If true, the transparent pixels of the CADRG frame are displayed as transparent; otherwise, they appear black.

Throws:

IOException - if an IO error occurs.

IlvMapFormatException - if a format error occurs.

IlvCADRGFrameReader

public IlvCADRGFrameReader(DataInput dataInput,
                           boolean transparency)
                    throws IOException,
                           IlvMapFormatException

Creates an instance of a CADRG frame reader from a dataInput opened on a CADRG Frame.

Parameters:

dataInput - the data input of the CADRG frame file

transparency - If true, the transparent pixels of the CADRG frame are displayed as transparent; otherwise, they appear black.

Throws:

IOException - if an IO error occurs.

IlvMapFormatException - if a format error occurs.

Method Detail

getCoordinateSystem

public IlvCoordinateSystem getCoordinateSystem()

Returns the spatial reference system that describes the coordinate system of geometric coordinates of the map features.

Specified by:

getCoordinateSystem in interface IlvMapFeatureIterator

Returns:

The coordinate system, or null if the coordinate system is unknown.

Since:

JViews 5.0

getUpperLeftCorner

public IlvCoordinate getUpperLeftCorner()

Returns the coordinates of the upper-left corner of the frame in longitude and latitude expressed in the readers' projection.

Specified by:

getUpperLeftCorner in interface IlvMapFeatureIterator

Returns:

the coordinates of the upper-left corner.

getLowerRightCorner

public IlvCoordinate getLowerRightCorner()

Returns the coordinates of the lower-right corner of the frame in longitude and latitude expressed in the reader's projection.

Specified by:

getLowerRightCorner in interface IlvMapFeatureIterator

Returns:

the coordinates of the lower-right corner.

getDefaultFeatureRenderer

public IlvFeatureRenderer getDefaultFeatureRenderer()

Returns the default renderer for this reader.

Specified by:

getDefaultFeatureRenderer in interface IlvMapFeatureIterator

Returns:

Returns the default renderer for this reader.

dispose

public void dispose()

Releases the resources allocated by the reader. This function can be called several times, but only the first call actually free resources.

Specified by:

dispose in interface IlvMapFeatureIterator

finalize

public void finalize()

Is called by the Java Garbage Collector to release the resources allocated to the reader. If the dispose method has not been called, it releases the resources used by the reader.

Overrides:

finalize in class Object

See Also:

dispose()

getNextFeature

public IlvMapFeature getNextFeature()
                             throws IOException

Returns the next feature read. A frame is usually composed of 36 subframes. This method returns null when all the features are read.

Specified by:

getNextFeature in interface IlvMapFeatureIterator

Returns:

the next feature read or null.

Throws:

IOException

readNextSubFrameRaster

public byte[] readNextSubFrameRaster()
                              throws IOException

Reads the next available buffer in the CADRG Frame file. Using this method directly prevents the use of getNextFeature().

Returns:

a 256*256 raster data coherent with the ColorModel

Throws:

IOException

Since:

JViews 7.5

See Also:

getNextFeature(), getColorModel()

isGeoreferenced

public boolean isGeoreferenced()

Returns false if the frame is an overview or a frame containing legends.

Specified by:

isGeoreferenced in interface IlvMapFeatureIterator

Returns:

true if frame is georeferenced.

getColorModel

public ColorModel getColorModel()

Returns the color model to use for this frame.

Returns:

Returns the color model to use for this frame.

Since:

JViews 7.5

getUpperLeftCorner

public IlvCoordinate getUpperLeftCorner(int subFrameIndex)

Returns the upper left coordinate of one of the 36 sub frames.

Parameters:

subFrameIndex - index of the sub frame (from 0 to 35)

Returns:

Returns the upper left coordinate of one of the 36 sub frames.

Since:

JViews 7.5

getLowerRightCorner

public IlvCoordinate getLowerRightCorner(int subFrameIndex)

Returns the lower right coordinate of one of the 36 sub frames.

Parameters:

subFrameIndex - index of the sub frame (from 0 to 35)

Returns:

Returns the lower right coordinate of one of the 36 sub frames.

Since:

JViews 7.5

isSubFrameValid

public boolean isSubFrameValid(int subFrame)

Returns true if the sub frame is defined in the CADRG frame.

Parameters:

subFrame - index of the sub frame (from 0 to 35)

Returns:

Returns true if the sub frame is defined in the CADRG frame.

Since:

JViews 7.5