org.oscim.tiling.source.mapfile.header

Class MapFileHeader

java.lang.Object

org.oscim.tiling.source.mapfile.header.MapFileHeader

public class MapFileHeader
extends java.lang.Object

Reads and validates the header data from a binary map file.

Constructor Summary

Constructors

Constructor and Description
MapFileHeader()

Method Summary

Modifier and Type	Method and Description
MapFileInfo	getMapFileInfo()
byte	getQueryZoomLevel(byte zoomLevel)
SubFileParameter	getSubFileParameter(int queryZoomLevel)
TileSource.OpenResult	readHeader(ReadBuffer readBuffer, long fileSize) Reads and validates the header block from the map file.

Methods inherited from class java.lang.Object

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

Constructor Detail

MapFileHeader

public MapFileHeader()

Method Detail

getMapFileInfo

public MapFileInfo getMapFileInfo()

Returns:

a MapFileInfo containing the header data.

getQueryZoomLevel

public byte getQueryZoomLevel(byte zoomLevel)

Parameters:

zoomLevel - the originally requested zoom level.

Returns:

the closest possible zoom level which is covered by a sub-file.

getSubFileParameter

public SubFileParameter getSubFileParameter(int queryZoomLevel)

Parameters:

queryZoomLevel - the zoom level for which the sub-file parameters are needed.

Returns:

the sub-file parameters for the given zoom level.

readHeader

public TileSource.OpenResult readHeader(ReadBuffer readBuffer,
                                        long fileSize)
                                 throws java.io.IOException

Reads and validates the header block from the map file.

Parameters:

readBuffer - the ReadBuffer for the file data.

fileSize - the size of the map file in bytes.

Returns:

a FileOpenResult containing an error message in case of a failure.

Throws:

java.io.IOException - if an error occurs while reading the file.