Mercurial > hg4j
annotate src/org/tmatesoft/hg/internal/FilterByteChannel.java @ 612:dca70c0b1f74
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author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Fri, 10 May 2013 14:29:35 +0200 |
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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.internal; |
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18 |
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19 import java.io.IOException; |
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20 import java.nio.ByteBuffer; |
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21 import java.util.ArrayList; |
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22 import java.util.Collection; |
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23 import java.util.List; |
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24 |
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25 import org.tmatesoft.hg.util.Adaptable; |
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26 import org.tmatesoft.hg.util.ByteChannel; |
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27 import org.tmatesoft.hg.util.CancelledException; |
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28 |
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29 /** |
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30 * |
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31 * @author Artem Tikhomirov |
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32 * @author TMate Software Ltd. |
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33 */ |
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34 public class FilterByteChannel implements ByteChannel, Adaptable { |
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35 private final Filter[] filters; |
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36 private final ByteChannel delegate; |
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37 |
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38 public FilterByteChannel(ByteChannel delegateChannel, Collection<Filter> filtersToApply) { |
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39 if (delegateChannel == null || filtersToApply == null) { |
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40 throw new IllegalArgumentException(); |
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41 } |
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42 delegate = delegateChannel; |
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43 filters = filtersToApply.toArray(new Filter[filtersToApply.size()]); |
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44 } |
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45 |
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46 public int write(ByteBuffer buffer) throws IOException, CancelledException { |
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47 final int srcPos = buffer.position(); |
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48 ByteBuffer processed = buffer; |
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49 for (Filter f : filters) { |
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50 // each next filter consumes not more than previous |
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51 // hence total consumed equals position shift in the original buffer |
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52 processed = f.filter(processed); |
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53 } |
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54 delegate.write(processed); |
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55 return buffer.position() - srcPos; // consumed as much from original buffer |
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56 } |
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57 |
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58 // adapters or implemented interfaces of the original class shall not be obfuscated by filter |
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59 public <T> T getAdapter(Class<T> adapterClass) { |
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60 if (adapterClass == Preview.class) { |
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61 ArrayList<Preview> previewers = new ArrayList<Preview>(filters.length); |
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62 Adaptable.Factory<Preview> factory = new Adaptable.Factory<Preview>(Preview.class); |
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63 for (Filter f : filters) { |
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64 Preview p = factory.get(f); |
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65 if (p != null) { |
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66 previewers.add(p); |
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67 } |
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68 } |
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69 if (!previewers.isEmpty()) { |
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70 @SuppressWarnings("unchecked") |
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71 T rv = (T) new PreviewSupport(previewers); |
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72 return rv; |
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73 } |
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74 // fall through to let delegate answer |
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75 } |
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76 return Adaptable.Factory.getAdapter(delegate, adapterClass, null); |
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77 } |
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78 |
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79 private static class PreviewSupport implements Preview { |
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80 private final Preview[] participants; |
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81 |
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82 public PreviewSupport(List<Preview> previewers) { |
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83 participants = new Preview[previewers.size()]; |
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84 previewers.toArray(participants); |
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85 } |
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86 |
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87 public void preview(ByteBuffer src) { |
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88 final int originalPos = src.position(); |
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89 for (Preview p : participants) { |
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90 p.preview(src); |
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91 // reset to initial state |
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92 src.position(originalPos); |
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93 } |
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94 } |
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95 } |
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96 } |