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public abstract class CacheObjectTransformerSpiAdapter extends IgniteSpiAdapter implements CacheObjectTransformerSpi {
...
    /**
     * Transforms the data.
     *
     * @param original Original data.
     * @return Transformed data.
     * @throws IgniteCheckedException when transformation is not possible/suitable.
     */
    protected abstract ByteBuffer transform(ByteBuffer original) throws IgniteCheckedException;

    /**
     * Restores the data.
     *
     * @param transformed Transformed data.
     * @param length Original data length.
     * @return Restored data.
     */
    protected abstract ByteBuffer restore(ByteBuffer transformed, int length);
}