TileDecompressorInitialisation.java

package nom.tam.image.compression.tile;

/*
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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.image.compression.tile.TileCompressionType.COMPRESSED;
import static nom.tam.image.compression.tile.TileCompressionType.GZIP_COMPRESSED;
import static nom.tam.image.compression.tile.TileCompressionType.UNCOMPRESSED;

import nom.tam.fits.FitsException;
import nom.tam.fits.compression.provider.param.api.IHeaderAccess;
import nom.tam.image.tile.operation.ITileOperationInitialisation;
import nom.tam.image.tile.operation.TileArea;

final class TileDecompressorInitialisation implements ITileOperationInitialisation<TileCompressionOperation> {

    private final Object[] uncompressed;

    private final Object[] compressed;

    private final Object[] gzipCompressed;

    private final IHeaderAccess header;

    private final TiledImageCompressionOperation imageTilesOperation;

    private int compressedOffset = 0;

    protected TileDecompressorInitialisation(TiledImageCompressionOperation imageTilesOperation, Object[] uncompressed, Object[] compressed, Object[] gzipCompressed,
            IHeaderAccess header) {
        this.imageTilesOperation = imageTilesOperation;
        this.uncompressed = uncompressed;
        this.compressed = compressed;
        this.gzipCompressed = gzipCompressed;
        this.header = header;
    }

    @Override
    public TileCompressionOperation createTileOperation(int tileIndex, TileArea area) {
        return new TileDecompressor(this.imageTilesOperation, tileIndex, area);
    }

    @Override
    public void init(TileCompressionOperation tileOperation) {
        tileOperation.setCompressedOffset(this.compressedOffset)//
                .setCompressed(this.compressed != null ? this.compressed[tileOperation.getTileIndex()] : null, COMPRESSED)//
                .setCompressed(this.uncompressed != null ? this.uncompressed[tileOperation.getTileIndex()] : null, UNCOMPRESSED)//
                .setCompressed(this.gzipCompressed != null ? this.gzipCompressed[tileOperation.getTileIndex()] : null, GZIP_COMPRESSED);
        tileOperation.createImageNullPixelMask(this.imageTilesOperation.getImageNullPixelMask());
        this.compressedOffset += tileOperation.getPixelSize();
    }

    @Override
    public void tileCount(int tileCount) throws FitsException {
        this.imageTilesOperation.compressOptions().getCompressionParameters().initializeColumns(this.header, this.imageTilesOperation.getBinaryTable(), tileCount);
    }
}