nom.tam.image.compression.tile.mask.AbstractNullPixelMask Maven / Gradle / Ivy

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package nom.tam.image.compression.tile.mask;

/*
 * #%L
 * nom.tam FITS library
 * %%
 * Copyright (C) 1996 - 2016 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,
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 * OTHER DEALINGS IN THE SOFTWARE.
 * #L%
 */

import java.nio.ByteBuffer;

import nom.tam.fits.compression.algorithm.api.ICompressorControl;
import nom.tam.image.tile.operation.buffer.TileBuffer;

public class AbstractNullPixelMask {

    private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];

    protected static final byte NULL_INDICATOR = (byte) 1;

    private final TileBuffer tileBuffer;

    private final int tileIndex;

    private final long nullValue;

    private ByteBuffer mask;

    private final ICompressorControl compressorControl;

    protected AbstractNullPixelMask(TileBuffer tileBuffer, int tileIndex, long nullValue, ICompressorControl compressorControl) {
        this.tileBuffer = tileBuffer;
        this.tileIndex = tileIndex;
        this.nullValue = nullValue;
        this.compressorControl = compressorControl;
        if (this.compressorControl == null) {
            throw new IllegalStateException("Compression algorithm for the null pixel mask not available");
        }
    }

    public byte[] getMaskBytes() {
        if (this.mask == null) {
            return EMPTY_BYTE_ARRAY;
        } else {
            int size = this.mask.position();
            byte[] result = new byte[size];
            this.mask.rewind();
            this.mask.get(result);
            return result;
        }
    }

    public void setMask(ByteBuffer mask) {
        this.mask = mask;
    }

    protected ICompressorControl getCompressorControl() {
        return this.compressorControl;
    }

    protected ByteBuffer getMask() {
        return this.mask;
    }

    protected long getNullValue() {
        return this.nullValue;
    }

    protected TileBuffer getTileBuffer() {
        return this.tileBuffer;
    }

    protected int getTileIndex() {
        return this.tileIndex;
    }

    protected ByteBuffer initializedMask(int remaining) {
        if (this.mask == null) {
            this.mask = ByteBuffer.allocate(remaining);
        }
        return this.mask;
    }
}