ilog.views.tiling

Interface IlvTileLoader

All Superinterfaces:

IlvPersistentObject, Serializable

All Known Implementing Classes:

IlvDefaultObjectSDOTileLoader, IlvDefaultSDOTileLoader, IlvImageTileLoader, IlvImageTileLoader, IlvMapTileLoader, IlvMultiTileLoader, IlvRasterSubsamplingLoader, IlvRasterTileLoader, IlvRegionOfInterestTileLoader, IlvSDOTileLoader, IlvShapeFileTileLoader, IlvThreadedTileLoader, IlvTiledShapeDataSource.FilteredShapeFileTileLoader

public interface IlvTileLoader
extends IlvPersistentObject

This interface is used to load a tile for an IlvTileController or an IlvTiledLayer.

The following example shows a tile loader that fills a tile with a generated list of graphic objects.

  class SimpleTileLoader 
    implements IlvTileLoader
  {
    public void load(IlvTile tile)
    {
      IlvRect rect = new IlvRect();
      tile.boundingBox(rect);
      IlvPoint p = new IlvPoint();
      p.x = rect.x;
      for (int i = 0; i < 10; i++) {
        p.y = rect.y;
        for (int j = 0; j < 10; j++) {
          tile.addObject(new IlvMarker(p, IlvMarker.IlvMarkerPlus), 
                         null);
          p.y += rect.height / 10;
        }
        p.x += rect.width / 10;
      }
      tile.loadComplete();
    }
    public void release(IlvTile tile)
    {
      tile.deleteAll();
    }

    public boolean isPersistent()
    {
      return false;
    }

    public void write(IlvOutputStream stream)
    {
      // do nothing 
    }
  }
 

Since:

Perforce JViews 3.0

See Also:

IlvTileController.setTileLoader(ilog.views.tiling.IlvTileLoader), IlvTiledLayer.setTileLoader(ilog.views.tiling.IlvTileLoader)

Method Summary

Modifier and Type	Method and Description
boolean	isPersistent() Returns true if the object must be saved by a tile controller.
void	load(IlvTile tile) Function called when a tile has to be loaded.
void	release(IlvTile tile) Function called when a tile has to be released.
void	write(IlvOutputStream stream) Writes the tile loader to an IlvOutputStream

Method Detail

load

void load(IlvTile tile)
   throws Exception

Function called when a tile has to be loaded. When the tile loader has finished its operation, it should call the function IlvTile.loadComplete to notify the tile listeners.

Throws:

Exception

release

void release(IlvTile tile)

Function called when a tile has to be released.

isPersistent

boolean isPersistent()

Returns true if the object must be saved by a tile controller.

write

void write(IlvOutputStream stream)
    throws IOException

Writes the tile loader to an IlvOutputStream

Specified by:

write in interface IlvPersistentObject

Parameters:

stream - the output stream

Throws:

IOException - thrown when an exception occurs during the write operation for this object.