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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.

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package nom.tam.util;

import java.io.IOException;

/*
 * #%L
 * nom.tam FITS library
 * %%
 * Copyright (C) 2004 - 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%
 */

/**
 * Interface that combines file-based random acesss with high-throughput array IO
 */
public interface RandomAccess extends ReadWriteAccess, ArrayDataInput {

    /**
     * @return the current position in the stream.
     */
    long getFilePointer();

    /**
     * Move to a specified location in the stream.
     *
     * @param  offsetFromStart set the offset messured from the start
     *
     * @throws IOException     if the operation fails
     */
    void seek(long offsetFromStart) throws IOException;

    @Override
    default long position() throws IOException {
        return getFilePointer();
    }

    @Override
    default void position(long pos) throws IOException {
        seek(pos);
    }

}