Method Detail

• isZero

  public static boolean isZero(double value)

  Determines whether value is 0, use the tolerance set in Environment. The determine precision defined in the Environment class includes zero determine precision and default value determine precision, here the default determine precision is used, that is the zero determine precision given by the system, see Environment for more information.

  Parameters:

  value - value to test

  Returns:

  True, if the value is zero; Otherwise, returns false.

  See Also:

  Environment

• isZero

  public static boolean isZero(double value,
                               double precision)

  Determines whether the given value is 0, use precision as the determine precision.

  Parameters:

  value - value to test

  precision - The precision user gave to determine whether the value is zero.

  Returns:

  a boolean, true means the value is 0.

  See Also:

  Environment

• isZero

  public static boolean isZero(double value,
                               double minPrecision,
                               double maxPrecision)

  Determines whether the specified value is zero with the minPrecision and the maxPrecision as the tolerance.

  Parameters:

  value - value to test

  maxPrecision - The specified maximum precision, which is the upper limit of the determined tolerance.

  minPrecision - The specified minimum precision, which is the lower limit of the determined tolerance.

  Returns:

  a boolean, true means the value is 0.

  See Also:

  Environment

• compactDatasource

  public static boolean compactDatasource(Datasource datasource)

  Compress the specified datasource so that the UDB datasource will occupy much less store space than before.

  The SMID of compressed geometry object will change. If you set the SMID as the external key for other tables, you should manage it before the compress operation.

  Parameters:

  datasource - The datasource object which need to be compressed. It is only effective on UDB engines, other engines will return false.

  Returns:

  A Boolean value represents whether the Compressing successfully. True, if successful;Otherwise,false.

• getEncodeType

  public static EncodeType[] getEncodeType(DatasetType type)

  Returns the array of encode type which the specified dataset type support.

  Parameters:

  type - the type of the dataset passed in.

  Returns:

  the array of encode types the dataset supports.

• clearErrors

  public static void clearErrors()

  Clears all the error log.

• extractCacheFile

  public boolean extractCacheFile(java.lang.String sourceFileName,
                                  java.lang.String targetFolderName)

  Extracts the Cache file to the specified path.

  Parameters:

  sourceFileName - The path of the cache file to be extracted.

  targetFolderName - the target folder path

  Returns:

  Returns true if successful, otherwise returns false.

• extractCacheFile

  public boolean extractCacheFile(java.lang.String sourceFileName,
                                  java.lang.String targetFolderName,
                                  java.lang.String password)

  Extracts the Cache file to the specified path.

  Parameters:

  sourceFileName - the source file name

  targetFolderName - the target folder path

  password - The password of the cache data.

  Returns:

  Returns true if successful; otherwise, false.

• unCompress

  public static boolean unCompress(java.lang.String srcFileName,
                                   java.lang.String targetFolder,
                                   java.lang.String password)

  Uncompresses the target file.

  Parameters:

  srcFileName - The full path of the source file.

  targetFolder - The full path of the target file. The full path is the file name after extracted.

  password - the specified password.

  Returns:

  Returns true if successful; otherwise false.

• calcAngle

  public static double calcAngle(Point2D p1,
                                 Point2D p2,
                                 Point2D p3)

  Calculates the clockwise angle between the two lines which are built by three points in order

  Parameters:

  p1 - the first point.

  p2 - The second point, the vertex of the angle

  p3 - the third point.

  Returns:

  Returns the angle, the unit is degree

• GeometryToGeoJson

  public static java.lang.String GeometryToGeoJson(Geometry geometry)

  Geometry object to GeoJson

  Parameters:

  geometry - Geometric objects

  Returns: