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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.text.undo.DocumentUndoManagerRegistry;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import java.util.HashMap;
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18 import java.util.Map;
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19
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20 import dwtx.core.runtime.Assert;
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21 import dwtx.jface.text.IDocument;
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22
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23
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24 /**
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25 * This document undo manager registry provides access to a document's
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26 * undo manager. In order to connect a document a document undo manager
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27 * call <code>connect</code>. After that call has successfully completed
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28 * undo manager can be obtained via <code>getDocumentUndoManager</code>.
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29 * The undo manager is created on the first connect and disposed on the last
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30 * disconnect, i.e. this registry keeps track of how often a undo manager is
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31 * connected and returns the same undo manager to each client as long as the
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32 * document is connected.
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33 * <p>
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34 * <em>The recoding of changes starts with the first {@link #connect(IDocument)}.</em></p>
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35 *
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36 * @since 3.2
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37 * @noinstantiate This class is not intended to be instantiated by clients.
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38 */
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39 public final class DocumentUndoManagerRegistry {
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40
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41 private static final class Record {
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42 public Record(IDocument document) {
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43 count= 0;
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44 undoManager= new DocumentUndoManager(document);
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45 }
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46 private int count;
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47 private IDocumentUndoManager undoManager;
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48 }
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49
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50 private static Map fgFactory= new HashMap();
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51
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52 private this() {
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53 // Do not instantiate
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54 }
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55
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56
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57 /**
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58 * Connects the file at the given location to this manager. After that call
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59 * successfully completed it is guaranteed that each call to <code>getFileBuffer</code>
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60 * returns the same file buffer until <code>disconnect</code> is called.
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61 * <p>
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62 * <em>The recoding of changes starts with the first {@link #connect(IDocument)}.</em></p>
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63 *
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64 * @param document the document to be connected
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65 */
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66 public static synchronized void connect(IDocument document) {
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67 Assert.isNotNull(document);
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68 Record record= (Record)fgFactory.get(document);
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69 if (record is null) {
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70 record= new Record(document);
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71 fgFactory.put(document, record);
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72 }
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73 record.count++;
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74 }
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75
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76 /**
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77 * Disconnects the given document from this registry.
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78 *
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79 * @param document the document to be disconnected
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80 */
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81 public static synchronized void disconnect(IDocument document) {
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82 Assert.isNotNull(document);
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83 Record record= (Record)fgFactory.get(document);
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84 record.count--;
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85 if (record.count is 0)
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86 fgFactory.remove(document);
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87
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88 }
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89
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90 /**
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91 * Returns the file buffer managed for the given location or <code>null</code>
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92 * if there is no such file buffer.
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93 * <p>
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94 * The provided location is either a full path of a workspace resource or
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95 * an absolute path in the local file system. The file buffer manager does
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96 * not resolve the location of workspace resources in the case of linked
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97 * resources.
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98 * </p>
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99 *
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100 * @param document the document for which to get its undo manager
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101 * @return the document undo manager or <code>null</code>
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102 */
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103 public static synchronized IDocumentUndoManager getDocumentUndoManager(IDocument document) {
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104 Assert.isNotNull(document);
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105 Record record= (Record)fgFactory.get(document);
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106 if (record is null)
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107 return null;
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108 return record.undoManager;
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109 }
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110
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111 }
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