IlvMapFeatureIterator (Perforce JViews 10.0 API)

All Known Subinterfaces:

IlvLookAheadFeatureIterator, IlvMapRegionOfInterestIterator, IlvMapReusableFeatureIterator

All Known Implementing Classes:

DB2FeatureIterator, IlvCADRGFrameReader, IlvComputedRasterReader, IlvDAFIFReader, IlvDBFeatureIterator, IlvDTEDReader, IlvGeotiffReader, IlvGraphicLayerDataSource, IlvGTopo30Reader, IlvImageReader, IlvKMLReader, IlvMake3DFlyThroughInteractor.RestartingDataSource, IlvMakeLineOfVisibilityInteractor.LineOfVisibilityDataSource, IlvMakeTerrainCutInteractor.TerrainCutDataSource, IlvMapDelegateFeatureIterator, IlvMapDXFReader, IlvMapSVGReader, IlvMIDMIFReader, IlvMIFReader, IlvObjectSDOFeatureIterator, IlvPolylineMergerDataSource, IlvPolylineSimplifierDataSource, IlvRasterAbstractReader, IlvRasterASRPReader, IlvRasterBasicImageReader, IlvRasterCADRGReader, IlvRasterDTEDReader, IlvRasterGeoTiffReader, IlvRasterReusableFeatureIterator, IlvRasterSDOReader, IlvRasterUSRPReader, IlvS57Reader, IlvSDODataSource.OracleIterator, IlvSDOFeatureIterator, IlvShapeFileReader, IlvSHPReader, IlvTigerReader, IlvVMAPReader, IlvWMSReader, InformixFeatureIterator
```
public interface IlvMapFeatureIterator
```
An interface used to implement feature iterators. A feature iterator is a convenient interface to access various map feature sources transparently. Feature iterators can be implemented by:
- classes of map readers that read simple map file formats (i.e. whose contents can be considered as lists of ordered objects), or
- classes representing query results, such as queries to a map server.
Since:

Perforce JViews 3.0

See Also:

IlvMapLoader

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`dispose()` Releases the resources allocated by the feature iterator (files, connections, and so on).
`IlvCoordinateSystem`	`getCoordinateSystem()` Returns the spatial reference system that describes the coordinate system of geometric coordinates of the map features.
`IlvFeatureRenderer`	`getDefaultFeatureRenderer()` Returns a renderer that can be used to translate the map features returned by this iterator into graphic objects.
`IlvCoordinate`	`getLowerRightCorner()` Returns the lower right corner of the rectangle containing all the map feature of the list, or `null` if the iterator cannot provide this information.
`IlvMapFeature`	`getNextFeature()` Returns the next map feature of the iterator or `null` if the iteration is finished.
`IlvCoordinate`	`getUpperLeftCorner()` Returns the upper left corner of the rectangle containing all the map features of the list, or `null` if the iterator cannot provide this information.
`boolean`	`isGeoreferenced()` Returns `true` if the map reader can provide the source projection of its map features.

- Method Detail
  - getNextFeature
```
IlvMapFeature getNextFeature()
                      throws IOException
```
    Returns the next map feature of the iterator or null if the iteration is finished. The returned map feature must be considered as volatile and can be modified by the reader during the next call to its getNextFeature function.
    
    Throws:
    
    IOException
  - isGeoreferenced
```
boolean isGeoreferenced()
```
    Returns true if the map reader can provide the source projection of its map features.
  - getCoordinateSystem
```
IlvCoordinateSystem getCoordinateSystem()
```
    Returns the spatial reference system that describes the coordinate system of geometric coordinates of the map features.
    
    Returns:
    
    The coordinate system, or null if the coordinate system is unknown.
    
    Since:
    
    JViews 5.0
  - getUpperLeftCorner
```
IlvCoordinate getUpperLeftCorner()
```
    Returns the upper left corner of the rectangle containing all the map features of the list, or null if the iterator cannot provide this information.
  - getLowerRightCorner
```
IlvCoordinate getLowerRightCorner()
```
    Returns the lower right corner of the rectangle containing all the map feature of the list, or null if the iterator cannot provide this information.
  - getDefaultFeatureRenderer
```
IlvFeatureRenderer getDefaultFeatureRenderer()
```
    Returns a renderer that can be used to translate the map features returned by this iterator into graphic objects. Feature iterators that store some rendering information in the attributes of the map features, such as color, text font, line thickness and so on, can return a specific renderer which is able to take these attributes into account during the rendering process.
  - dispose
```
void dispose()
```
    Releases the resources allocated by the feature iterator (files, connections, and so on).

Interface IlvMapFeatureIterator

Method Summary

Method Detail

getNextFeature

isGeoreferenced

getCoordinateSystem

getUpperLeftCorner

getLowerRightCorner

getDefaultFeatureRenderer

dispose