1 package nom.tam.fits; 2 3 /*- 4 * #%L 5 * nom.tam FITS library 6 * %% 7 * Copyright (C) 1996 - 2024 nom-tam-fits 8 * %% 9 * This is free and unencumbered software released into the public domain. 10 * 11 * Anyone is free to copy, modify, publish, use, compile, sell, or 12 * distribute this software, either in source code form or as a compiled 13 * binary, for any purpose, commercial or non-commercial, and by any 14 * means. 15 * 16 * In jurisdictions that recognize copyright laws, the author or authors 17 * of this software dedicate any and all copyright interest in the 18 * software to the public domain. We make this dedication for the benefit 19 * of the public at large and to the detriment of our heirs and 20 * successors. We intend this dedication to be an overt act of 21 * relinquishment in perpetuity of all present and future rights to this 22 * software under copyright law. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 27 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR 28 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 29 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 30 * OTHER DEALINGS IN THE SOFTWARE. 31 * #L% 32 */ 33 34 import java.io.PrintStream; 35 36 /** 37 * A class of HDU that contains only a header only with no associated data. Such HDUs are commonly used as the primary 38 * HDU in FITS files where the leading data is not an image, since only images may constitute the primary HDU. 39 * 40 * @author Attila Kovacs 41 * 42 * @since 1.18 43 * 44 * @see NullData 45 */ 46 @SuppressWarnings("deprecation") 47 public class NullDataHDU extends ImageHDU { 48 49 /** 50 * Instantiates a new HDU with a default header and no associated data. 51 */ 52 public NullDataHDU() { 53 super(new Header(), new NullData()); 54 getData().fillHeader(getHeader()); 55 } 56 57 @Override 58 public NullData getData() { 59 return (NullData) super.getData(); 60 } 61 62 /** 63 * Instantiates a new HDU with only the supplied header and no associated data. 64 * 65 * @param myHeader the FITS header for this HDU 66 */ 67 public NullDataHDU(Header myHeader) { 68 super(myHeader, new NullData()); 69 getData().fillHeader(getHeader()); 70 } 71 72 @Override 73 public void info(PrintStream stream) { 74 stream.println(" Header Only"); 75 } 76 }