Class FitsUtil

java.lang.Object
nom.tam.fits.FitsUtil
public final class FitsUtil extends Object
This class comprises static utility functions used throughout the FITS classes.

  • Field Details

    • BYTE_REPRESENTING_BLANK

      private static final int BYTE_REPRESENTING_BLANK
      See Also:

    • BYTE_REPRESENTING_MAX_ASCII_VALUE

      private static final int BYTE_REPRESENTING_MAX_ASCII_VALUE
      See Also:

    • LOG

      private static final Logger LOG
      the logger to log to.

    • wroteCheckingError

      private static boolean wroteCheckingError

  • Constructor Details

    • FitsUtil

      private FitsUtil()
      Utility class, do not instantiate it.

  • Method Details

    • addPadding

      public static int addPadding(int size)
      Parameters:
      size - the current size.
      Returns:
      Total size of blocked FITS element, using e.v. padding to fits block size.

    • addPadding

      public static long addPadding(long size)
      Parameters:
      size - the current size.
      Returns:
      Total size of blocked FITS element, using e.v. padding to fits block size.

    • booleanToByte

      static byte[] booleanToByte(boolean[] bool)
      Parameters:
      bool - array of booleans
      Returns:
      Convert an array of booleans to bytes.

    • byteArrayToStrings

      public static String[] byteArrayToStrings(byte[] bytes, int maxLen)
      Parameters:
      bytes - byte array to convert
      maxLen - the max string length
      Returns:
      Convert bytes to Strings.

    • byteToBoolean

      static boolean[] byteToBoolean(byte[] bytes)
      Parameters:
      bytes - the array of bytes to get the booleans from.
      Returns:
      Convert an array of bytes to booleans.

    • findOffset

      public static long findOffset(Closeable o)
      Parameters:
      o - the stream to get the position
      Returns:
      Find out where we are in a random access file .

    • getURLStream

      public static InputStream getURLStream(URL url, int level) throws IOException
      Parameters:
      url - the url to get the stream from
      level - max levels of redirection
      Returns:
      Get a stream to a URL accommodating possible redirections. Note that if a redirection request points to a different protocol than the original request, then the redirection is not handled automatically.
      Throws:
      IOException - if the operation failed

    • maxLength

      public static int maxLength(String[] strings) throws FitsException
      Parameters:
      strings - array of strings to check
      Returns:
      Get the maximum length of a String in a String array.
      Throws:
      FitsException - if the operation failed

    • pad

      public static void pad(ArrayDataOutput stream, long size) throws FitsException
      Add padding to an output stream.
      Parameters:
      stream - stream to pad
      size - the current size
      Throws:
      FitsException - if the operation failed

    • pad

      public static void pad(ArrayDataOutput stream, long size, byte fill) throws FitsException
      Add padding to an output stream.
      Parameters:
      stream - stream to pad
      size - the current size
      fill - the fill byte to use
      Throws:
      FitsException - if the operation failed

    • padding

      public static int padding(int size)
      Parameters:
      size - the size without padding
      Returns:
      How many bytes are needed to fill a 2880 block?

    • padding

      public static int padding(long size)

    • reposition

      public static void reposition(Closeable o, long offset) throws FitsException
      Reposition a random access stream to a requested offset.
      Parameters:
      o - the closable to reposition
      offset - the offset to position it to.
      Throws:
      FitsException - if the operation was failed or not possible

    • stringsToByteArray

      public static byte[] stringsToByteArray(String[] stringArray, int maxLen)
      Convert an array of Strings to bytes.
      Parameters:
      stringArray - the array with Strings
      maxLen - the max length (in bytes) of every String
      Returns:
      the resulting bytes