| java.lang.Object | ||
| ↳ | com.carto.datasources.TileDataSource | |
| ↳ | com.carto.datasources.CombinedTileDataSource | |
Class Overview
A tile data source that combines two data sources (usually offline and online) and selects tiles
based on zoom level. All requests below specified zoom level are directed to the first data source
and all requests at or above specified zoom level are directed to the second data source.
Summary
| Public Constructors | |||||||||||
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CombinedTileDataSource(TileDataSource dataSource1, TileDataSource dataSource2, int zoomLevel)
Constructs a combined tile data source object.
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| Public Methods | |||||||||||
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| synchronized void | delete() | ||||||||||
| MapBounds |
getDataExtent()
Returns the extent of the tiles in this data source.
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| int |
getMaxZoom()
Returns the maximum zoom level supported by this data source.
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| int |
getMinZoom()
Returns the minimum zoom level supported by this data source.
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| TileData |
loadTile(MapTile tile)
Loads the specified tile.
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[Expand]
Inherited Methods | |||||||||||
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From class
com.carto.datasources.TileDataSource
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From class
java.lang.Object
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Public Constructors
public CombinedTileDataSource (TileDataSource dataSource1, TileDataSource dataSource2, int zoomLevel)
Constructs a combined tile data source object.
Parameters
| dataSource1 | First data source that is used if requested tile is below given zoomLevel. |
|---|---|
| dataSource2 | Second data source that is used if requested tile is at or above given zoomLevel. |
| zoomLevel | Threshold zoom level value. |
Public Methods
public synchronized void delete ()
public MapBounds getDataExtent ()
Returns the extent of the tiles in this data source.
The bounds are in coordinate system of the projection of the data source.
Returns
- The extent of the data source.
public int getMaxZoom ()
Returns the maximum zoom level supported by this data source.
Returns
- The maximum zoom level supported (exclusive).
public int getMinZoom ()
Returns the minimum zoom level supported by this data source.
Returns
- The minimum zoom level supported (inclusive).
public TileData loadTile (MapTile tile)
Loads the specified tile.
Note: the tile coordinate system used here is vertically flipped relative to layer tile coordinate system.
Parameters
| tile | The tile to load. |
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Returns
- The tile data. If the tile is not available, null may be returned.