CompressHeaderParameter.java

package nom.tam.fits.compression.provider.param.base;

/*
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 * nom.tam FITS library
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 * Copyright (C) 1996 - 2021 nom-tam-fits
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 * distribute this software, either in source code form or as a compiled
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import static nom.tam.fits.header.Compression.ZNAMEn;
import static nom.tam.fits.header.Compression.ZVALn;

import nom.tam.fits.HeaderCard;
import nom.tam.fits.compression.provider.param.api.ICompressHeaderParameter;
import nom.tam.fits.compression.provider.param.api.IHeaderAccess;

public abstract class CompressHeaderParameter<OPTION> extends CompressParameter<OPTION> implements ICompressHeaderParameter {

    protected CompressHeaderParameter(String name, OPTION option) {
        super(name, option);
    }

    public HeaderCard findZVal(IHeaderAccess header) {
        int nval = 1;
        HeaderCard card = header.findCard(ZNAMEn.n(nval));
        while (card != null) {
            if (card.getValue().equals(getName())) {
                return header.findCard(ZVALn.n(nval));
            }
            card = header.findCard(ZNAMEn.n(++nval));
        }
        return null;
    }

    public int nextFreeZVal(IHeaderAccess header) {
        int nval = 1;
        HeaderCard card = header.findCard(ZNAMEn.n(nval));
        while (card != null) {
            card = header.findCard(ZNAMEn.n(++nval));
        }
        return nval;
    }
}