1 | /**
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2 | * DefaultTreeWriter.java
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3 | * Copyright (C) 2010 New Zealand Digital Library, http://expeditee.org
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4 | *
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5 | * This program is free software: you can redistribute it and/or modify
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6 | * it under the terms of the GNU General Public License as published by
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7 | * the Free Software Foundation, either version 3 of the License, or
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8 | * (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 | */
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18 |
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19 | package org.expeditee.io;
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20 |
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21 | import java.io.IOException;
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22 | import java.util.List;
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23 | import java.util.Stack;
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24 |
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25 | import org.expeditee.gui.Frame;
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26 | import org.expeditee.gui.FrameIO;
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27 | import org.expeditee.gui.MessageBay;
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28 | import org.expeditee.io.flowlayout.XGroupItem;
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29 | import org.expeditee.items.Item;
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30 | import org.expeditee.items.Text;
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31 |
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32 | public abstract class DefaultTreeWriter extends DefaultFrameWriter implements
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33 | TreeWriter {
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34 |
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35 | private int _indent = 0;
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36 |
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37 | // the list of frames currently being processed
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38 | private Stack<FrameCounter> _frames = new Stack<FrameCounter>();
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39 |
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40 | private int _frameCount = 0;
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41 |
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42 | public int getFrameCount() {
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43 | return _frameCount;
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44 | }
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45 |
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46 | public String writeTree(Frame toWrite) throws IOException {
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47 | try {
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48 | initialise(toWrite);
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49 | outputTree(toWrite);
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50 |
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51 | } catch (IOException ioe) {
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52 | _running = false;
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53 | throw ioe;
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54 | } catch (Exception e) {
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55 | e.printStackTrace();
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56 | }
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57 | _running = false;
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58 | return finaliseTree();
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59 | }
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60 |
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61 | /**
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62 | * This method is used to output any tags before following the Item's link
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63 | * when using tree writers.
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64 | *
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65 | * @param linker
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66 | * The linked Item that is about to be followed.
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67 | * @throws IOException
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68 | */
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69 | protected void writeStartLink(Item linker) throws IOException {
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70 | _indent++;
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71 | }
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72 |
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73 | /**
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74 | * This method is called after the Frame the Item links to has been
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75 | * processed. This allows end tags to be written if the format requires it.
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76 | *
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77 | * @param linker
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78 | * The Item whose link was just followed.
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79 | * @throws IOException
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80 | */
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81 | protected void writeEndLink(Item linker) throws IOException {
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82 | _indent--;
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83 | }
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84 |
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85 | protected void resumeFrame(Frame resuming) {
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86 | }
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87 |
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88 | protected List<Item> getSortedItems(Frame frame)
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89 | {
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90 | List<Item> items = frame.getSortedItems();
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91 | return items;
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92 | }
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93 |
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94 | protected void outputTree(Frame toWrite) throws IOException {
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95 | if (toWrite == null) {
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96 | return;
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97 | }
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98 |
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99 | XGroupItem.doImplicitBoxing = false;
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100 |
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101 | _frames.push(new FrameCounter(toWrite.getName(), -1));
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102 |
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103 | // process the entire tree of frames in depth-first order
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104 | while (_frames.size() > 0) {
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105 | FrameCounter cur = _frames.pop();
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106 |
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107 | if (_stop)
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108 | return;
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109 |
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110 | Frame next = FrameIO.LoadFrame(cur.frame);
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111 |
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112 | if (next == null) {
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113 | return;
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114 | }
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115 |
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116 | Text title = next.getTitleItem();
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117 |
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118 | // the items on the frame currently being processed.
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119 | List<Item> items = getSortedItems(next);
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120 |
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121 | // write any information relating to the end of the link
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122 | if (cur.index > 0) {
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123 | this.writeEndLink(items.get(cur.index));
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124 | this.resumeFrame(next);
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125 | } else {
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126 | MessageBay.overwriteMessage("Writing: " + next.getName());
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127 | _frameCount++;
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128 | writeStartFrame(next);
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129 | }
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130 |
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131 | boolean complete = true;
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132 |
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133 | // resume from the next item in the list
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134 | for (int i = cur.index + 1; i < items.size(); i++) {
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135 | if (_stop)
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136 | return;
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137 |
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138 | Item item = items.get(i);
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139 |
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140 | // ignore annotation and framenames
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141 | if (item.getID() >= 0) {
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142 | // Only follow the links of non annotation text items
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143 | boolean followLink = item instanceof Text
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144 | && item.getLink() != null
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145 | && (!item.isAnnotation() /*|| item.getText()
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146 | .toLowerCase().equals("@next")*/);
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147 |
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148 | if (followLink) {
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149 | cur.index = i;
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150 | _frames.push(cur);
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151 |
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152 | // write any information relating to the start of the
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153 | // link
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154 | this.writeStartLink(item);
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155 |
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156 | Frame linked = FrameIO
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157 | .LoadFrame(item.getAbsoluteLink());
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158 |
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159 | // if the linked frame was found, then display it next
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160 | if (linked != null) {
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161 | FrameCounter fc = new FrameCounter(
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162 | linked.getName(), -1);
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163 | if (!_frames.contains(fc)) {
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164 | // remember what frame we are on before
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165 | // processing it
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166 | _frames.push(fc);
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167 |
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168 | complete = false;
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169 | // process the loaded frame immediately
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170 | // (depth-first)
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171 | break;
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172 | }
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173 | }
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174 | // Don't write out the title here because it is written
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175 | // out earlier
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176 | } else if (item != title)
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177 | this.writeItem(item);
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178 | }
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179 | }
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180 |
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181 | if (complete)
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182 | writeEndFrame(next);
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183 | }
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184 | }
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185 |
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186 | protected String finaliseTree() throws IOException {
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187 | return "Tree" + finalise();
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188 | }
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189 |
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190 | /**
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191 | * Inner class used to keep track of what frames have been seen, as well as
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192 | * what Item in the Frame the processing was up to. Only Frame names are
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193 | * stored to keep memory usage down.
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194 | */
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195 | private class FrameCounter {
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196 | public int index;
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197 |
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198 | public String frame;
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199 |
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200 | public FrameCounter(String f, int i) {
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201 | frame = f.toLowerCase();
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202 | index = i;
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203 | }
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204 |
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205 | @Override
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206 | public boolean equals(Object o) {
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207 | if (o instanceof FrameCounter)
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208 | return (((FrameCounter) o).frame.equals(frame));// && fc.index
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209 | // == index);
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210 |
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211 | return false;
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212 | }
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213 | }
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214 |
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215 | protected int getIndent() {
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216 | return _indent;
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217 | }
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218 | }
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