Class AbstractFitsTableWriter

Method Details

• getFormatName

  public String getFormatName()

  Specified by:

  getFormatName in interface uk.ac.starlink.table.StarTableWriter

• setFormatName

  public void setFormatName(String formatName)

  Sets the declared format name.

  Parameters:

  formatName - format name

• getMimeType

  public String getMimeType()

  Returns "application/fits".

  Specified by:

  getMimeType in interface uk.ac.starlink.table.StarTableWriter

  Returns:

  MIME type

• writeStarTable

  public void writeStarTable(uk.ac.starlink.table.StarTable table, OutputStream out) throws IOException

  Writes a single table. Invokes writeStarTables(TableSequence, OutputStream).

  Specified by:

  writeStarTable in interface uk.ac.starlink.table.StarTableWriter

  Throws:

  IOException

• writeStarTables

  public void writeStarTables(uk.ac.starlink.table.TableSequence tableSeq, OutputStream out) throws IOException

  Writes tables. Calls writePrimaryHDU(java.io.OutputStream) to write the primary HDU. Subclasses which want to put something related to the input tables into the primary HDU will need to override this method (writeStarTables).

  Specified by:

  writeStarTables in interface uk.ac.starlink.table.MultiStarTableWriter

  Throws:

  IOException

• writeStarTables

  public void writeStarTables(uk.ac.starlink.table.TableSequence tableSeq, String location, uk.ac.starlink.table.StarTableOutput sto) throws IOException

  Invokes writeStarTables(uk.ac.starlink.table.TableSequence, java.io.OutputStream).

  Specified by:

  writeStarTables in interface uk.ac.starlink.table.MultiStarTableWriter

  Throws:

  IOException

• writePrimaryHDU

  public void writePrimaryHDU(OutputStream out) throws IOException

  Writes the primary HDU. This cannot contain a table since BINTABLE HDUs can only be extensions. The AbstractFitsTableWriter implementation writes a minimal, data-less HDU.

  Parameters:

  out - destination stream

  Throws:

  IOException

• writeTableHDU

  public void writeTableHDU(uk.ac.starlink.table.StarTable table, FitsTableSerializer fitser, OutputStream out) throws IOException

  Writes a data HDU.

  Parameters:

  table - the table to be written into the HDU

  fitser - fits serializer initalised from table

  out - destination stream

  Throws:

  IOException

• getConfig

  public FitsTableSerializerConfig getConfig()

  Returns the configuration details for writing FITS files. Its content can be controlled using single-config-item mutator methods (which may also be labelled as ConfigMethods) on this class. This covers things that are generally orthogonal to the type of serialization, so may be set for any kind of FITS output, which is why it makes sense to manage them in the AbstractFitsTableWriter abstract superclass.

  Returns:

  object representing the FITS serialization options currently configured for this writer

• createSerializer

  protected abstract FitsTableSerializer createSerializer(uk.ac.starlink.table.StarTable table) throws IOException

  Provides a suitable serializer for a given table. Note this should throw an IOException if it can be determined that the submitted table cannot be written by this writer, for instance if it has too many columns.

  Parameters:

  table - table to serialize

  Returns:

  FITS serializer

  Throws:

  IOException - if the table can't be written

• getMetadataCards

  protected List<CardImage> getMetadataCards()

  Adds some standard metadata header cards to a FITS table header. This includes date stamp, STIL version, etc.

  Returns:

  list of cards giving write-specific metadata

• setWriteDate

  @ConfigMethod(property="date", doc="<p>If true, the DATE-HDU header is filled in with the current date; otherwise it is not included.</p>") public void setWriteDate(boolean writeDate)

  Configures whether a datestamp is written to output FITS files.

  Parameters:

  writeDate - true to include DATE-HDU, false to omit it

• getWriteDate

  public boolean getWriteDate()

  Indicates whether a datestamp is written to output FITS files.

  Returns:

  true to include DATE-HDU, false to omit it

• setAllowSignedByte

  public void setAllowSignedByte(boolean allowSignedByte)

  Configures how Byte-valued columns are written. This is a bit fiddly, since java bytes are signed, but FITS 8-bit integers are unsigned. If true, they are written as FITS unsigned 8-bit integers with an offset, as discussed in the FITS standard (TFORMn='B', TZERO=-128). If false, they are written as FITS signed 16-bit integers.

  Parameters:

  allowSignedByte - true to write offset bytes, false to write shorts

• getAllowSignedByte

  public boolean getAllowSignedByte()

  Returns a flag indicating how Byte-valued columns are written.

  Returns:

  true to write offset bytes, false to write shorts

• setAllowZeroLengthString

  public void setAllowZeroLengthString(boolean allowZeroLengthString)

  Sets whether zero-length string columns may be written. Such columns (TFORMn='0A') are explicitly permitted by the FITS standard, but they can cause crashes because of divide-by-zero errors when encountered by some versions of CFITSIO (v3.50 and earlier), so FITS writing code may wish to avoid them. If this is set false, then A repeat values will always be >=1.

  Parameters:

  allowZeroLengthString - false to prevent zero-length string columns

• getAllowZeroLengthString

  public boolean getAllowZeroLengthString()

  Indicates whether zero-length string columns may be output.

  Returns:

  false if zero-length string columns are avoided

• setWide

  public void setWide(WideFits wide)

  Sets the convention for representing over-wide (>999 column) tables.

  Parameters:

  wide - wide-table representation policy, null to avoid wide tables

• getWide

  public WideFits getWide()

  Indicates the convention in use for representing over-wide tables.

  Returns:

  wide-table representation policy, null for no wide tables

• setPadCharacter

  public void setPadCharacter(byte padChar)

  Sets the byte value with which under-length string (character array) values should be padded. This should normally be one of 0x00 (ASCII NUL) or 0x20 (space). The function of an ASCII NUL is to terminate the string early, as described in Section 7.3.3.1 of the FITS 4.0 standard; space characters pad it to its declared length with whitespace. Other values in the range 0x21-0x7E are permitted but probably not sensible.

  Parameters:

  padChar - character data padding byte

• getPadCharacter

  public byte getPadCharacter()

  Returns the byte value with which under-length string (character array) values will be padded. This will normally be one of 0x00 (ASCII NUL) or 0x20 (space).

  Returns:

  character data padding byte

• getCurrentDate

  public static String getCurrentDate()

  Returns an ISO-8601 data string representing the time at which this method is called.

  Returns:

  date string