Package com.luciad.earth.tileset.util

Class ALcdEarthTileSetWrapper

java.lang.Object
com.luciad.earth.tileset.util.ALcdEarthTileSetWrapper
All Implemented Interfaces:
ILcdEarthTileSet, ILcdBounded, ILcdDisposable, AutoCloseable
Direct Known Subclasses:
ALcdEarthCoverageFilterTileSet, ALcdEarthTileSetMultilevelRaster, TLcdEarthAsynchronousTileSet, TLcdEarthLevelFallbackTileSet, TLcdEarthMemoryCachingTileSet, TLcdEarthMultiTileSet, TLcdEarthThreadSafeTileSet
public abstract class ALcdEarthTileSetWrapper extends Object implements ILcdEarthTileSet
Base class for wrappers around an ILcdEarthTileSet. This class implements all required methods, so that derived classes need only override the methods they are interested in and do not need to manually delegate all other methods to the wrapped tileset. Note that this class is abstract, as instantiating it directly would be pointless.

Care should be taken when overriding the produceTile(com.luciad.earth.tileset.ILcdEarthTileSetCoverage, int, long, long, com.luciad.reference.ILcdGeoReference, com.luciad.earth.tileset.TLcdEarthTileFormat, com.luciad.earth.tileset.TLcdEarthTileOperationMode, com.luciad.earth.tileset.ILcdEarthTileSetCallback, java.lang.Object) or updateTile(com.luciad.earth.tileset.ALcdEarthTile, com.luciad.earth.tileset.TLcdEarthTileOperationMode, com.luciad.earth.tileset.ILcdEarthTileSetCallback, java.lang.Object) method. These methods have 2 versions (a regular one and a callback based one) which should both be overridden in most cases to provide a consistent view on the tile set.

Since:
8.2

  • Constructor Details

    • ALcdEarthTileSetWrapper

      public ALcdEarthTileSetWrapper(ILcdEarthTileSet aDelegate)
      Creates a new wrapper around the specified tileset.
      Parameters:
      aDelegate - the wrapped tileset

  • Method Details

    • getDelegateTileSet

      public ILcdEarthTileSet getDelegateTileSet()
      Returns the wrapped tileset.
      Returns:
      the wrapped tileset

    • produceTile

      public void produceTile(ILcdEarthTileSetCoverage aCoverage, int aLevel, long aTileX, long aTileY, ILcdGeoReference aGeoReference, TLcdEarthTileFormat aFormat, TLcdEarthTileOperationMode aMode, ILcdEarthTileSetCallback aCallback, Object aContext)
      Description copied from interface: ILcdEarthTileSet
      Produces the requested tile, and invoke the supplied callback when done. The resulting tile is passed to the call back's tileAvailable() method. If the tile cannot be produced for some reason, the method tileNotAvailable() should be called instead.

      If the tileset supports it and aMode is TLcdEarthTileOperationMode.PREFER_ASYNCHRONOUS, the tile request may be executed asynchronously. However, the callback must be invoked at some point in time, unless the cancelTile() method is used to cancel the tile request before it is executed. If aMode is TLcdEarthTileOperationMode.FORCE_SYNCHRONOUS, the request must be executed synchronously and the callback must be invoked before produceTile() returns.

      Tiles may be requested in reference systems other than the native geo reference of the underlying data, provided that the isGeoReferenceSupported() method returns true for the requested reference. If this is not the case, the tileset should call tileNotAvailable(). If the tileset calls tileAvailable(), the geo reference of the resulting tile must be equal to aGeoReference, and the tile's bounds must likewise be expressed in this reference.

      Similarly, tiles may be requested in different data formats, as described by TLcdEarthTileFormat. The format determines the type of the data object that will be contained in the requested tile. To check if a format is supported, use isFormatSupported(). If the specified format is not supported, the tileset should call tileNotAvailable().

      The context parameter may be used to pass application-specific data into the tileset. If it is not needed, its value may be null.

      Specified by:
      produceTile in interface ILcdEarthTileSet
      Parameters:
      aCoverage - the coverage from which the tile is requested
      aLevel - the level from which the tile is requested
      aTileX - the column index of the requested tile
      aTileY - the row index of the requested tile
      aGeoReference - the reference system in which the tile should be returned
      aFormat - the desired format of the tile's data
      aMode - controls the synchronous or asynchronous behaviour of the tileset
      aCallback - will be invoked when the tile is available to be used
      aContext - application-specific data to be used by the tileset, if any

    • dispose

      public void dispose()
      Description copied from interface: ILcdEarthTileSet
      This method releases all resources held by the repository, such as file locks, threads or server connections.
      Specified by:
      dispose in interface ILcdDisposable
      Specified by:
      dispose in interface ILcdEarthTileSet

    • getBounds

      public ILcdBounds getBounds()
      Description copied from interface: ILcdEarthTileSet
      Returns the bounds of this tile set, expressed in the model reference of the model that contains this tile set.
      Specified by:
      getBounds in interface ILcdBounded
      Specified by:
      getBounds in interface ILcdEarthTileSet
      Returns:
      the bounds of this tile set
      See Also:

    • getLevelCount

      public int getLevelCount()
      Description copied from interface: ILcdEarthTileSet
      Returns the number of available detail levels. Level 0 is the coarsest level.
      Specified by:
      getLevelCount in interface ILcdEarthTileSet
      Returns:
      the number of available detail levels

    • getTileRowCount

      public long getTileRowCount(int aLevel)
      Description copied from interface: ILcdEarthTileSet
      Returns the number of rows in the tile grid at the given level. Each level should have twice the number of rows of the previous one.
      Specified by:
      getTileRowCount in interface ILcdEarthTileSet
      Parameters:
      aLevel - the level to be queried
      Returns:
      the number of tile rows on the specified level

    • getTileColumnCount

      public long getTileColumnCount(int aLevel)
      Description copied from interface: ILcdEarthTileSet
      Returns the number of columns in the tile grid at the given level. Each level should have twice the number of columns of the previous one.
      Specified by:
      getTileColumnCount in interface ILcdEarthTileSet
      Parameters:
      aLevel - the level to be queried
      Returns:
      the number of tile columns on the specified level

    • getTileSetCoverageCount

      public int getTileSetCoverageCount()
      Description copied from interface: ILcdEarthTileSet
      Returns the number of coverages this tileset contains.
      Specified by:
      getTileSetCoverageCount in interface ILcdEarthTileSet
      Returns:
      the number of coverages this tileset contains

    • getTileSetCoverage

      public ILcdEarthTileSetCoverage getTileSetCoverage(int aIndex)
      Description copied from interface: ILcdEarthTileSet
      Returns the coverage at the specified index.
      Specified by:
      getTileSetCoverage in interface ILcdEarthTileSet
      Parameters:
      aIndex - the index of the coverage to return
      Returns:
      the requested ILcdEarthTileSetCoverage

    • containsTileSetCoverage

      public boolean containsTileSetCoverage(String aCoverageName)
      Description copied from interface: ILcdEarthTileSet
      Returns true if the repository contains a coverage with the specified name.
      Specified by:
      containsTileSetCoverage in interface ILcdEarthTileSet
      Parameters:
      aCoverageName - the name of the coverage to look for
      Returns:
      true if the repository contains a coverage with the specified name, false otherwise

    • getTileSetCoverage

      public ILcdEarthTileSetCoverage getTileSetCoverage(String aCoverageName)
      Description copied from interface: ILcdEarthTileSet
      Returns the tileset coverage with the specified name.
      Specified by:
      getTileSetCoverage in interface ILcdEarthTileSet
      Parameters:
      aCoverageName - the name of the coverage to look for
      Returns:
      the tileset coverage with the specified name

    • updateTile

      public void updateTile(ALcdEarthTile aTile, TLcdEarthTileOperationMode aMode, ILcdEarthTileSetCallback aCallback, Object aContext)
      Description copied from interface: ILcdEarthTileSet
      Produces an updated version of the given tile, if necessary. Produces the same tile if the given tile is up to date.
      Specified by:
      updateTile in interface ILcdEarthTileSet
      Parameters:
      aTile - tile to check
      aMode - controls the synchronous or asynchronous behaviour of the tileset
      aCallback - will be invoked when the tile is available to be used
      aContext - application-specific data to be used by the tileset, if any

    • cancelTile

      public void cancelTile(int aLevel, long aTileX, long aTileY, ILcdEarthTileSetCoverage aCoverage, ILcdGeoReference aGeoReference, TLcdEarthTileFormat aFormat, ILcdEarthTileSetCallback aCallback, Object aContext)
      This method should be overridden if the produceTile and/or updateTile is overridden and the new implementation calls the implementation of this class using different parameters than passed to it.

      If the produceTile is overridden as 

       super.produceTile( myCoverage, aLevel, aTileX, aTileY, aGeoReference, aFormat, aMode, new MyTileSetCallback( aCallback ), aContext );
      this method should be overridden as 
       super.cancelTile( aLevel, aTileX, aTileY, myCoverage, aGeoReference, aFormat, new MyTileSetCallback( aCallback ), aContext );
      where MyTileSetCallback instances with the same delegate callback are equal.
      Specified by:
      cancelTile in interface ILcdEarthTileSet
      Parameters:
      aLevel - the level from which the tile is requested
      aTileX - the column index of the requested tile
      aTileY - the row index of the requested tile
      aCoverage - the coverage from which the tile is requested
      aGeoReference - the reference system in which the tile is requested
      aFormat - the format in which the tile is requested
      aCallback - would be invoked when the tile would have been available to be used
      aContext - application-specific data to be used by the tileset, if any

    • produceTile

      public ALcdEarthTile produceTile(ILcdEarthTileSetCoverage aCoverage, int aLevel, long aX, long aY, ILcdGeoReference aGeoReference, TLcdEarthTileFormat aFormat, Object aContext) throws IOException
      Description copied from interface: ILcdEarthTileSet
      Gets a tile from the repository.
      Specified by:
      produceTile in interface ILcdEarthTileSet
      Parameters:
      aCoverage - the coverage from which to query a tile
      aLevel - the detail level for which to query a tile
      aX - the column index at which to query a tile
      aY - the row index at which to query a tile
      aGeoReference - the georeference of the requested tile
      aFormat - the format of the requested tile
      aContext - application-specific data to be used by the tileset, if any
      Returns:
      the requested tile, or null if the repository does not contain this tile
      Throws:
      IOException - if the tile cannot be produced

    • isGeoReferenceSupported

      public boolean isGeoReferenceSupported(ILcdEarthTileSetCoverage aCoverage, ILcdGeoReference aGeoReference)
      Description copied from interface: ILcdEarthTileSet
      Returns true if the tileset can produce tiles for the given coverage in the given reference system. Note that any reference other than the native reference may result in reduced performance.

      This method must always return true for the native reference of the coverage. If it returns true for any other georeference, then the tileset must be able to handle the georeference in question in its produceTile() method.

      Specified by:
      isGeoReferenceSupported in interface ILcdEarthTileSet
      Parameters:
      aCoverage - the coverage to check for
      aGeoReference - the reference to check for
      Returns:
      true if the given coverage can be queried with the given reference

    • isFormatSupported

      public boolean isFormatSupported(ILcdEarthTileSetCoverage aCoverage, TLcdEarthTileFormat aFormat)
      Description copied from interface: ILcdEarthTileSet
      Returns true if the tileset can produce tiles for the given coverage in the given format. Note that any format other than the native format may result in reduced performance.

      This method must always return true for the native format of the coverage. If it returns true for any other format, then the tileset must be able to handle the format in question in its produceTile() method.

      Specified by:
      isFormatSupported in interface ILcdEarthTileSet
      Parameters:
      aCoverage - the coverage to check for
      aFormat - the format to check for
      Returns:
      true if the given coverage can be queried with the given format

    • containsTile

      public boolean containsTile(ILcdEarthTileSetCoverage aCoverage, int aLevel, long aX, long aY, Object aContext)
      Description copied from interface: ILcdEarthTileSet
      Returns true if the repository contains the specified tile.
      Specified by:
      containsTile in interface ILcdEarthTileSet
      Parameters:
      aCoverage - the coverage from which to query a tile
      aLevel - the detail level for which to query a tile
      aX - the column index at which to query a tile
      aY - the row index at which to query a tile
      aContext - application-specific data to be used by the tileset, if any
      Returns:
      true if the repository contains the requested tile

    • updateTile

      public ALcdEarthTile updateTile(ALcdEarthTile aEarthTile, Object aContext) throws IOException
      Description copied from interface: ILcdEarthTileSet
      Returns an updated version of the specified tile.
      Specified by:
      updateTile in interface ILcdEarthTileSet
      Parameters:
      aEarthTile - the tile to check
      aContext - application-specific data to be used by the tileset, if any
      Returns:
      the tile itself or a new, updated version
      Throws:
      IOException - if the tile cannot be updated