[1097] | 1 | package org.expeditee.gio;
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| 2 |
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| 3 | import java.io.File;
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| 4 | import java.io.IOException;
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| 5 | import java.net.URI;
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| 6 | import java.net.URISyntaxException;
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| 7 | import java.util.LinkedList;
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| 8 | import java.util.List;
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| 9 | import java.util.StringTokenizer;
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| 10 |
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| 11 | import org.expeditee.core.Point;
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| 12 | import org.expeditee.gui.DisplayController;
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| 13 | import org.expeditee.importer.FileImporter;
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| 14 | import org.expeditee.importer.FilePathImporter;
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| 15 | import org.expeditee.importer.ImageImporter;
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| 16 | import org.expeditee.importer.TextImporter;
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| 17 | import org.expeditee.importer.pdfImporter;
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| 18 | import org.expeditee.items.Item;
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| 19 | import org.expeditee.items.Text;
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| 20 |
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| 21 | /** TODO: Comment. cts16 */
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| 22 | public abstract class DragAndDropManager {
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| 23 |
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| 24 | /** The list of custom file importers registered with the DnD manager. */
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| 25 | private List<FileImporter> _customFileImporters = new LinkedList<FileImporter>();
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| 26 |
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| 27 | /** The list of standard file importers registered with the DnD manager. */
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| 28 | private List<FileImporter> _standardFileImporters = new LinkedList<FileImporter>();
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| 29 |
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| 30 | /** Standard constructor. */
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| 31 | protected DragAndDropManager()
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| 32 | {
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| 33 | // Set up the standard file importers
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| 34 | _standardFileImporters.add(new ImageImporter());
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| 35 | _standardFileImporters.add(new pdfImporter());
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| 36 | _standardFileImporters.add(new TextImporter());
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| 37 | _standardFileImporters.add(new FilePathImporter()); // Filepath importer as last resort
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| 38 | }
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| 39 |
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| 40 | /**
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| 41 | * Adds a custom importer. If an importer competes with another importer for
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| 42 | * handling the same file types, the importer that was added first will have
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| 43 | * first serve.
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| 44 | *
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| 45 | * @param importer
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| 46 | * The importer to add. Must not be null
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| 47 | *
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| 48 | * @throws NullPointerException
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| 49 | * if importer is null.
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| 50 | */
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| 51 | public void addCustomFileImporter(FileImporter importer)
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| 52 | {
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| 53 | if (importer == null) throw new NullPointerException("importer");
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| 54 |
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| 55 | if (!_customFileImporters.contains(importer)) {
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| 56 | _customFileImporters.add(importer);
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| 57 | }
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| 58 | }
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| 59 |
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| 60 | /**
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| 61 | * Removes a custom importer.
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| 62 | *
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| 63 | * @param importer
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| 64 | * The importer to remove.
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| 65 | *
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| 66 | * @throws NullPointerException
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| 67 | * if importer is null.
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| 68 | */
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| 69 | public void removeCustomFileImporter(FileImporter importer)
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| 70 | {
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| 71 | if (importer == null) throw new NullPointerException("importer");
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| 72 |
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| 73 | _customFileImporters.remove(importer);
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| 74 | }
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| 75 |
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| 76 | /**
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| 77 | * Imports a string into expeditee's current frame
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| 78 | *
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| 79 | * @param text
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| 80 | * The text content.
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| 81 | *
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| 82 | * @param expediteeDropPoint
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| 83 | * The location in the current expeditee frame of where to drop
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| 84 | * the text item.
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| 85 | */
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| 86 | public static Text importString(String text, Point expediteeDropPoint)
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| 87 | {
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| 88 | assert (DisplayController.getCurrentFrame() != null);
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| 89 | assert (text != null && text.length() > 0);
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| 90 |
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| 91 | Text importedTextItem = new Text(DisplayController.getCurrentFrame().getNextItemID(), text);
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| 92 | importedTextItem.setPosition(expediteeDropPoint);
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| 93 |
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| 94 | DisplayController.getCurrentFrame().addItem(importedTextItem);
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| 95 | DisplayController.requestRefresh(true);
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| 96 |
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| 97 | return importedTextItem;
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| 98 | }
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| 99 |
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| 100 | /** Imports a list of files into Expeditee's current frame. */
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| 101 | public void importFileList(List<? extends File> files, Point expediteeDropPoint) throws IOException
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| 102 | {
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| 103 | Point currentPoint = new Point(expediteeDropPoint);
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| 104 |
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| 105 | // import files one by one
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| 106 | for (File fileToImport : files) {
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| 107 |
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| 108 | Item lastItem = importFile(fileToImport, currentPoint);
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| 109 |
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| 110 | if (lastItem == null) {
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[1142] | 111 | currentPoint.setY(currentPoint.getY() + 30);
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[1097] | 112 | } else {
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[1142] | 113 | currentPoint.setY(currentPoint.getY() + lastItem.getBoundsHeight());
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[1097] | 114 | }
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| 115 | // of the item that was created
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| 116 |
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| 117 | // TODO: Better placement strategy
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| 118 | // if (currentPoint.y > (Browser._theBrowser.getHeight() - 20))
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| 119 | // currentPoint.y = Browser._theBrowser.getHeight() - 20;
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| 120 | }
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| 121 | }
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| 122 |
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| 123 | /**
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| 124 | * Imports a file into Expeditee. Any custom importers registered get first attempt,
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| 125 | * followed by the standard importers.
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| 126 | *
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| 127 | * @param f
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| 128 | * The file to import.
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| 129 | *
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| 130 | * @param expediteeDropPoint
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| 131 | *
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| 132 | * @throws IOException
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| 133 | */
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| 134 | public Item importFile(File f, Point expediteeDropPoint) throws IOException
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| 135 | {
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| 136 | assert (f != null);
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| 137 |
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| 138 | // Check for custom importers first. They get preference to standard
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| 139 | // importing routines...
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| 140 | Item lastCreatedItem;
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| 141 | if (null == (lastCreatedItem = performFileImport(_customFileImporters, f, expediteeDropPoint))) {
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| 142 | // Standard file importing
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| 143 | lastCreatedItem = performFileImport(_standardFileImporters, f, expediteeDropPoint);
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| 144 | }
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| 145 |
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| 146 | return lastCreatedItem;
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| 147 | }
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| 148 |
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| 149 | /**
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| 150 | * Imports a single file into Expeditee's current frame. Importers are given the opportunity to
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| 151 | * interpret the file in order of their addition to the list.
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| 152 | */
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| 153 | private Item performFileImport(List<FileImporter> importers, File f, Point expediteeDropPoint) throws IOException
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| 154 | {
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| 155 | for (FileImporter fi : importers) {
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| 156 | Item lastCreated = fi.importFile(f, expediteeDropPoint);
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| 157 |
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| 158 | if (lastCreated != null) return lastCreated;
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| 159 | }
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| 160 |
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| 161 | return null;
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| 162 | }
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| 163 |
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| 164 | /**
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| 165 | * Converts a string formatted as a list of URIs into a list of Files.
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| 166 | *
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| 167 | * Code adopted from SUN - java BUG ID 4899516 workaround for KDE/GNOME
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| 168 | * Desktops
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| 169 | *
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| 170 | * @param uriListString
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| 171 | * Formatted according to RFC 2483
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| 172 | *
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| 173 | * @return The list of FILES in the uriListString. Never null.
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| 174 | */
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| 175 | protected List<File> textURIListToFileList(String uriListString)
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| 176 | {
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| 177 | List<File> fileList = new LinkedList<File>();
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| 178 |
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| 179 | for (StringTokenizer st = new StringTokenizer(uriListString, "\r\n"); st.hasMoreTokens();) {
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| 180 |
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| 181 | String s = st.nextToken();
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| 182 |
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| 183 | if (s.startsWith("#")) {
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| 184 | // the line is a comment (as per the RFC 2483)
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| 185 | continue;
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| 186 | }
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| 187 |
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| 188 | try {
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| 189 |
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| 190 | URI uri = new URI(s);
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| 191 | File file = new File(uri);
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| 192 | fileList.add(file);
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| 193 |
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| 194 | } catch (URISyntaxException e) {
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| 195 | // malformed URI
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| 196 | } catch (IllegalArgumentException e) {
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| 197 | // the URI is not a valid 'file:' URI
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| 198 | }
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| 199 | }
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| 200 |
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| 201 | return fileList;
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| 202 | }
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| 203 | }
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