nom.tam.fits.NullData Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of nom-tam-fits Show documentation

Java library for reading and writing FITS files. FITS, the Flexible Image Transport System, is the format commonly used in the archiving and transport of astronomical data.

There is a newer version: 1.21.0

Show newest version

package nom.tam.fits;

import java.nio.Buffer;

/*-
 * #%L
 * nom.tam FITS library
 * %%
 * Copyright (C) 1996 - 2024 nom-tam-fits
 * %%
 * This is free and unencumbered software released into the public domain.
 *
 * Anyone is free to copy, modify, publish, use, compile, sell, or
 * distribute this software, either in source code form or as a compiled
 * binary, for any purpose, commercial or non-commercial, and by any
 * means.
 *
 * In jurisdictions that recognize copyright laws, the author or authors
 * of this software dedicate any and all copyright interest in the
 * software to the public domain. We make this dedication for the benefit
 * of the public at large and to the detriment of our heirs and
 * successors. We intend this dedication to be an overt act of
 * relinquishment in perpetuity of all present and future rights to this
 * software under copyright law.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 * #L%
 */

import nom.tam.fits.header.Bitpix;
import nom.tam.util.ArrayDataInput;
import nom.tam.util.ArrayDataOutput;

import static nom.tam.fits.header.Standard.EXTEND;
import static nom.tam.fits.header.Standard.GCOUNT;
import static nom.tam.fits.header.Standard.PCOUNT;

/**
 * A subclass of Data containing no actual data. It wraps an underlying data of null.
 *
 * @author Attila Kovacs
 *
 * @since  1.18
 * 
 * @see    NullDataHDU
 */
public final class NullData extends ImageData {

    @SuppressWarnings("deprecation")
    @Override
    protected void fillHeader(Header head) {
        head.setSimple(true);
        head.setBitpix(Bitpix.INTEGER);
        head.setNaxes(0);

        // Just in case!
        head.addValue(EXTEND, true);
        head.addValue(GCOUNT, 1);
        head.addValue(PCOUNT, 0);
    }

    @Override
    protected void loadData(ArrayDataInput in) {
        return;
    }

    @Override
    protected Void getCurrentData() {
        return null;
    }

    @Override
    protected long getTrueSize() {
        return 0;
    }

    @Override
    public void read(ArrayDataInput in) {
        setFileOffset(in);
    }

    @Override
    public void write(ArrayDataOutput o) {
    }

    @Override
    public void setBuffer(Buffer data) {
        // Nothing to do.
    }

}