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annotate src/org/tmatesoft/hg/util/RegularFileInfo.java @ 356:91d75e1bac9f

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Consistent approach to deal with adaptable objects. Give adaptable precedence over instanceof to allow conditional response when classes do implement desired interface
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 06 Dec 2011 14:25:52 +0100
parents 981f9f50bb6c
children 7f27122011c3
rev   line source
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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 import org.tmatesoft.hg.internal.StreamLogFacility;
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27
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28 /**
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 public class RegularFileInfo implements FileInfo {
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34 private File file;
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35
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36 public RegularFileInfo() {
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37 }
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38
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39 public void init(File f) {
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40 file = f;
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41 }
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42
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43 public boolean exists() {
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44 return file.canRead() && file.isFile();
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45 }
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46
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47 public int lastModified() {
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48 return (int) (file.lastModified() / 1000);
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49 }
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50
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51 public long length() {
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52 return file.length();
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53 }
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54
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55 public ReadableByteChannel newInputChannel() {
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56 try {
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57 return new FileInputStream(file).getChannel();
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58 } catch (FileNotFoundException ex) {
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59 StreamLogFacility.newDefault().debug(getClass(), ex, null);
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60 // shall not happen, provided this class is used correctly
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61 return new ReadableByteChannel() {
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62
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63 public boolean isOpen() {
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64 return true;
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65 }
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66
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67 public void close() throws IOException {
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68 }
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70 public int read(ByteBuffer dst) throws IOException {
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71 // EOF right away
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72 return -1;
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73 }
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74 };
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75 }
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76 }
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78 }