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annotate src/org/tmatesoft/hg/util/FileInfo.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents ed6b74a58c66
children 7f27122011c3
rev   line source
287
ed6b74a58c66 Use FileInfo abstraction with necessary subset of File functionality instead of File to facilitate other effective file system iterators
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.util;
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18
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19 import java.nio.channels.ReadableByteChannel;
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20
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21 /**
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22 * Subset of File-related functionality to support other than {@link java.io.File}-based {@link FileIterator} implementations
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23 *
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24 * @author Artem Tikhomirov
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25 * @author TMate Software Ltd.
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26 */
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27 public interface FileInfo {
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28
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29 /**
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30 * @return true if the filesystem object described by this instance exists, is a regular file and can be read
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31 */
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32 boolean exists();
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33
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34 /**
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35 * File last modification time, in seconds since Jan 1, 1970. E.g. <code> {@link java.io.File#lastModified()} / 1000 </code>
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36 * @return int value representing time, in seconds, when file was last modified.
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37 */
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38 int lastModified();
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39
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40 /**
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41 * @return file size
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42 */
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43 long length();
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44
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45 /**
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46 * Access file contents. Caller is responsible to close the channel.
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47 * @return file reader object, never <code>null</code>
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48 */
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49 ReadableByteChannel newInputChannel();
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50 }