Package nom.tam.fits.header
Enum Class Checksum
- All Implemented Interfaces:
Serializable
,Comparable<Checksum>
,Constable
,IFitsHeader
File checksum keywords. This data dictionary contains FITS keywords that have
been widely used within the astronomical community. It is recommended that
these keywords only be used as defined here.
- Author:
- Richard van Nieuwenhoven
- See Also:
-
Nested Class Summary
Nested classes/interfaces inherited from class java.lang.Enum
Enum.EnumDesc<E extends Enum<E>>
Nested classes/interfaces inherited from interface nom.tam.fits.header.IFitsHeader
IFitsHeader.HDU, IFitsHeader.SOURCE, IFitsHeader.VALUE
-
Enum Constant Summary
Enum ConstantsEnum ConstantDescriptionThe value field of the CHECKSUM keyword shall contain a 16 character string, left justified starting in column 12, containing the ASCII encoded complement of the checksum of the FITS HDU (Header and Data Unit).The value field of the CHECKVER keyword shall contain a string, unique in the first 8 characters, which distinguishes between any future alternative checksum algorithms which may be defined.The value field of the DATASUM keyword shall be a character string containing the unsigned integer value of the checksum of the data records of the HDU. -
Method Summary
-
Enum Constant Details
-
CHECKSUM
The value field of the CHECKSUM keyword shall contain a 16 character string, left justified starting in column 12, containing the ASCII encoded complement of the checksum of the FITS HDU (Header and Data Unit). The algorithm shall be the 32-bit 1's complement checksum and the ASCII encoding that are described in the checksum proposal. The checksum is accumulated in FITS datastream order on the same HDU, identical in all respects, except that the value of the CHECKSUM keyword shall be set to the string '0000000000000000' (ASCII 0's, hex 30) before the checksum is computed. -
CHECKVER
The value field of the CHECKVER keyword shall contain a string, unique in the first 8 characters, which distinguishes between any future alternative checksum algorithms which may be defined. The default value for a missing keyword shall be 'COMPLEMENT' which will represent the algorithm defined in the current proposal. It is recommended that this keyword be omitted from headers which implement the default ASCII encoded 32-bit 1's complement algorithm. -
DATASUM
The value field of the DATASUM keyword shall be a character string containing the unsigned integer value of the checksum of the data records of the HDU. For dataless HDU's, this keyword may either be omitted, or the value field shall contain the string value '0', which is preferred. A missing DATASUM keyword asserts no knowledge of the checksum of the data records.
-
-
Method Details
-
values
Returns an array containing the constants of this enum class, in the order they are declared.- Returns:
- an array containing the constants of this enum class, in the order they are declared
-
valueOf
Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)- Parameters:
name
- the name of the enum constant to be returned.- Returns:
- the enum constant with the specified name
- Throws:
IllegalArgumentException
- if this enum class has no constant with the specified nameNullPointerException
- if the argument is null
-
comment
- Specified by:
comment
in interfaceIFitsHeader
-
hdu
- Specified by:
hdu
in interfaceIFitsHeader
-
key
- Specified by:
key
in interfaceIFitsHeader
-
n
- Specified by:
n
in interfaceIFitsHeader
-
status
- Specified by:
status
in interfaceIFitsHeader
-
valueType
- Specified by:
valueType
in interfaceIFitsHeader
-