1 package nom.tam.fits.compression.provider.param.quant;
2
3 import nom.tam.fits.Header;
4
5 /*
6 * #%L
7 * nom.tam FITS library
8 * %%
9 * Copyright (C) 1996 - 2024 nom-tam-fits
10 * %%
11 * This is free and unencumbered software released into the public domain.
12 *
13 * Anyone is free to copy, modify, publish, use, compile, sell, or
14 * distribute this software, either in source code form or as a compiled
15 * binary, for any purpose, commercial or non-commercial, and by any
16 * means.
17 *
18 * In jurisdictions that recognize copyright laws, the author or authors
19 * of this software dedicate any and all copyright interest in the
20 * software to the public domain. We make this dedication for the benefit
21 * of the public at large and to the detriment of our heirs and
22 * successors. We intend this dedication to be an overt act of
23 * relinquishment in perpetuity of all present and future rights to this
24 * software under copyright law.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
29 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
30 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
31 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
32 * OTHER DEALINGS IN THE SOFTWARE.
33 * #L%
34 */
35
36 import nom.tam.fits.HeaderCard;
37 import nom.tam.fits.HeaderCardException;
38 import nom.tam.fits.compression.algorithm.quant.QuantizeOption;
39 import nom.tam.fits.compression.provider.param.base.CompressHeaderParameter;
40 import nom.tam.fits.header.Compression;
41
42 /**
43 * (<i>for internal use</i>) The quantization method name as recorded in the FITS header.
44 */
45 final class ZQuantizeParameter extends CompressHeaderParameter<QuantizeOption> {
46
47 ZQuantizeParameter(QuantizeOption quantizeOption) {
48 super(Compression.ZQUANTIZ.name(), quantizeOption);
49 }
50
51 @Override
52 public void getValueFromHeader(Header header) throws HeaderCardException {
53 if (getOption() == null) {
54 return;
55 }
56
57 HeaderCard card = header.getCard(getName());
58 String value = card != null ? card.getValue() : null;
59
60 getOption().setDither(false);
61 getOption().setDither2(false);
62
63 if (Compression.ZQUANTIZ_SUBTRACTIVE_DITHER_1.equals(value)) {
64 getOption().setDither(true);
65 } else if (Compression.ZQUANTIZ_SUBTRACTIVE_DITHER_2.equals(value)) {
66 getOption().setDither(true);
67 getOption().setDither2(true);
68 }
69 }
70
71 @Override
72 public void setValueInHeader(Header header) throws HeaderCardException {
73 if (getOption() == null) {
74 return;
75 }
76
77 String value;
78
79 if (getOption().isDither2()) {
80 value = Compression.ZQUANTIZ_SUBTRACTIVE_DITHER_2;
81 } else if (getOption().isDither()) {
82 value = Compression.ZQUANTIZ_SUBTRACTIVE_DITHER_1;
83 } else {
84 value = Compression.ZQUANTIZ_NO_DITHER;
85 }
86 header.addValue(Compression.ZQUANTIZ, value);
87 }
88 }