1 | package org.expeditee.agents;
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2 |
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3 | import java.util.List;
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4 | import java.util.Stack;
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5 |
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6 | import org.expeditee.gui.Frame;
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7 | import org.expeditee.gui.FrameIO;
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8 | import org.expeditee.items.Item;
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9 |
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10 | /**
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11 | * This class provides some generic methods that process a tree of Frames.
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12 | * Subclasses that only use text items can simply implement
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13 | * processTextItem(Text, int)
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14 | */
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15 | public abstract class TreeProcessor extends DefaultAgent {
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16 |
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17 | // the list of frames currently being processed
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18 | private Stack<FrameCounter> _frames = new Stack<FrameCounter>();
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19 |
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20 | /**
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21 | * Processes the Frame by calling processItem() for each unlinked item
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22 | * encountered. Linked items call processStartLinkItem(), then load the
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23 | * linked frame and process it recursively, upon returning
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24 | * processEndLinkItem() is called.
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25 | */
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26 | protected Frame process(Frame toProcess) {
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27 | if (_stop)
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28 | return null;
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29 |
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30 | if (toProcess == null)
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31 | return null;
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32 |
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33 | _frames.push(new FrameCounter(toProcess.getFrameName(), -1));
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34 |
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35 | // process the entire tree of frames in depth-first order
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36 | while (_frames.size() > 0) {
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37 | if (_stop)
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38 | return null;
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39 |
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40 | FrameCounter cur = _frames.pop();
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41 |
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42 | Frame next = FrameIO.LoadFrame(cur.frame);
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43 | if (next == null) {
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44 | message("There is no " + cur.frame + " Frame to display");
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45 | return null;
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46 | }
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47 |
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48 | if (cur.index < 0) {
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49 | if (next != null)
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50 | overwriteMessage("Processing: " + next.getFrameName());
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51 | processFrame(next);
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52 | }
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53 |
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54 | // the items on the frame currently being processed.
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55 | List<Item> items = next.getItems();
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56 |
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57 | // resume from the next item in the list
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58 | for (int i = cur.index + 1; i < items.size(); i++) {
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59 | Item item = items.get(i);
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60 |
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61 | // ignore annotation and framenames
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62 | if (!item.isAnnotation() && item.getID() >= 0) {
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63 | if (item.getLink() != null) {
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64 | cur.index = i;
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65 | _frames.push(cur);
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66 |
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67 | Frame linked = FrameIO.LoadFrame(item.getAbsoluteLink());
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68 |
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69 | // if the linked frame was found, then display it next
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70 | if (linked != null) {
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71 | FrameCounter fc = new FrameCounter(linked
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72 | .getFrameName(), -1);
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73 | if (!_frames.contains(fc)) {
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74 | // remember what frame we are on before
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75 | // processing it
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76 | _frames.push(fc);
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77 |
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78 | // processFrame(linked);
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79 |
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80 | // process the loaded frame immediately
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81 | // (depth-first)
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82 | break;
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83 | }
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84 | }
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85 | }
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86 | }
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87 | }
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88 | }
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89 |
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90 | return null;
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91 | }
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92 |
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93 | protected abstract void processFrame(Frame toProcess);
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94 |
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95 | /**
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96 | * Inner class used to keep track of what frames have been seen, as well as
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97 | * what Item in the Frame the processing was up to. Only Frame names are
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98 | * stored to keep memory usage down.
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99 | */
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100 | private class FrameCounter {
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101 | public int index;
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102 |
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103 | public String frame;
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104 |
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105 | public FrameCounter(String f, int i) {
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106 | frame = f.toLowerCase();
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107 | index = i;
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108 | }
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109 |
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110 | @Override
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111 | public boolean equals(Object o) {
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112 | if (o instanceof FrameCounter)
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113 | return (((FrameCounter) o).frame.equals(frame));// && fc.index
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114 | // == index);
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115 |
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116 | return false;
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117 | }
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118 | }
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119 |
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120 | }
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