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annotate src/org/tmatesoft/hg/util/RegularFileInfo.java @ 287:ed6b74a58c66

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Use FileInfo abstraction with necessary subset of File functionality instead of File to facilitate other effective file system iterators
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 07 Sep 2011 09:33:27 +0200
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children 981f9f50bb6c
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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.io.File;
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20 import java.io.FileInputStream;
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21 import java.io.FileNotFoundException;
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22 import java.io.IOException;
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23 import java.nio.ByteBuffer;
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24 import java.nio.channels.ReadableByteChannel;
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25
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26 /**
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class RegularFileInfo implements FileInfo {
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32 private File file;
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33
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34 public RegularFileInfo() {
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35 }
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36
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37 public void init(File f) {
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38 file = f;
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39 }
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40
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41 public boolean exists() {
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42 return file.canRead() && file.isFile();
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43 }
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44
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45 public int lastModified() {
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46 return (int) (file.lastModified() / 1000);
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47 }
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48
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49 public long length() {
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50 return file.length();
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51 }
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52
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53 public ReadableByteChannel newInputChannel() {
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54 try {
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55 return new FileInputStream(file).getChannel();
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56 } catch (FileNotFoundException ex) {
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57 ex.printStackTrace(); // FIXME log debug.
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58 // shall not happen, provided this class is used correctly
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59 return new ReadableByteChannel() {
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60
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61 public boolean isOpen() {
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62 return true;
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63 }
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64
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65 public void close() throws IOException {
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66 }
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67
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68 public int read(ByteBuffer dst) throws IOException {
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69 // EOF right away
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70 return -1;
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71 }
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72 };
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73 }
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74 }
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75
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76 }