src/share/classes/java/nio/file/attribute/FileStoreSpaceAttributes.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package java.nio.file.attribute;

/**
 * Space related attributes of a file store.
 *
 * @since 1.7
 *
 * @see Attributes#readFileStoreSpaceAttributes
 */

public interface FileStoreSpaceAttributes {
    /**
     * Returns the size, in bytes, of the file store.
     */
    long totalSpace();

    /**
     * Returns the number of bytes available to this Java virtual machine on the
     * file store.
     *
     * <p> The returned number of available bytes is a hint, but not a
     * guarantee, that it is possible to use most or any of these bytes.  The
     * number of usable bytes is most likely to be accurate immediately
     * after the space attributes are obtained. It is likely to be made inaccurate
     * by any external I/O operations including those made on the system outside
     * of this Java virtual machine.
     */
    long usableSpace();

    /**
     * Returns the number of unallocated bytes in the file store.
     *
     * <p> The returned number of unallocated bytes is a hint, but not a
     * guarantee, that it is possible to use most or any of these bytes.  The
     * number of unallocated bytes is most likely to be accurate immediately
     * after the space attributes are obtained. It is likely to be
     * made inaccurate by any external I/O operations including those made on
     * the system outside of this virtual machine.
     */
    long unallocatedSpace();
}