uk.ac.starlink.fits

## Class HeaderCards

- java.lang.Object
- - uk.ac.starlink.fits.HeaderCards

-     public class HeaderCards
      extends java.lang.Object

  Controlled access to a collection of FITS header cards. Currently decorates the `Header` class, but could be implemented on top of some other (possibly custom) header cards parser implementation.
  Since:
    12 Nov 2007
  Author:
    Mark Taylor

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `java.lang.String[]` | `BORING_KEYS` Keywords which are never used as table parameters.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `HeaderCards(nom.tam.fits.Header hdr)` Constructor.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `containsKey(java.lang.String key)` Indicates whether the header collection contains a card with the given keyword.
    `java.lang.Double` | `getDoubleValue(java.lang.String key)` Returns the double value for a card with a given key.
    `java.lang.Integer` | `getIntValue(java.lang.String key)` Returns the integer value for a card with a given key.
    `java.lang.Long` | `getLongValue(java.lang.String key)` Returns the long value for a card with a given key.
    `java.lang.String` | `getStringValue(java.lang.String key)` Returns the string value for a card with a given key.
    `uk.ac.starlink.table.DescribedValue[]` | `getUnusedParams()` Returns an array of DescribedValue objects suitable for use as items of per-table metadata derived from this FITS header.
    `void` | `useKey(java.lang.String key)` Marks a given keyword as used.

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### BORING_KEYS

          public final java.lang.String[] BORING_KEYS

      Keywords which are never used as table parameters.

  - ### Constructor Detail

    - #### HeaderCards

          public HeaderCards(nom.tam.fits.Header hdr)

      Constructor.
      Parameters:
        `hdr` - FITS header object

  - ### Method Detail

    - #### getIntValue

          public java.lang.Integer getIntValue(java.lang.String key)

      Returns the integer value for a card with a given key.
      Parameters:
        `key` - header keyword
      Returns:
        integer value, or null

    - #### getLongValue

          public java.lang.Long getLongValue(java.lang.String key)

      Returns the long value for a card with a given key.
      Parameters:
        `key` - header keyword
      Returns:
        long value, or null

    - #### getDoubleValue

          public java.lang.Double getDoubleValue(java.lang.String key)

      Returns the double value for a card with a given key.
      Parameters:
        `key` - header keyword
      Returns:
        double value, or null

    - #### getStringValue

          public java.lang.String getStringValue(java.lang.String key)

      Returns the string value for a card with a given key.
      Parameters:
        `key` - header keyword
      Returns:
        string value, or null

    - #### useKey

          public void useKey(java.lang.String key)

      Marks a given keyword as used. This is invoked by all the `get*Value` methods.
      Parameters:
        `key` - header keyword

    - #### containsKey

          public boolean containsKey(java.lang.String key)

      Indicates whether the header collection contains a card with the given keyword.
      Parameters:
        `key` - header keyword
      Returns:
        true iff `key` is present

    - #### getUnusedParams

          public uk.ac.starlink.table.DescribedValue[] getUnusedParams()

      Returns an array of DescribedValue objects suitable for use as items of per-table metadata derived from this FITS header. This contains entries for every card which has not already been queried within this object (for which `useKey(java.lang.String)` has not been explicitly or implicitly called. Certain standard structural FITS keywords (`BORING_KEYS`) are ignored as well.

      The idea is that keywords which have already been read to determine table structure do not need to be recorded separately since their meaning is implicitly included in the table metadata already.

      Returns:
        array of table parameters relating to this object

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