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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.edits.UndoEdit;
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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.ArrayList;
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18 import java.util.List;
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19
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20 import dwtx.jface.text.BadLocationException;
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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 class encapsulates the reverse changes of an executed text
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26 * edit tree. To apply an undo memento to a document use method
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27 * <code>apply(IDocument)</code>.
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28 * <p>
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29 * Clients can't add additional children to an undo edit nor can they
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30 * add an undo edit as a child to another edit. Doing so results in
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31 * both cases in a <code>MalformedTreeException<code>.
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32 *
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33 * @since 3.0
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34 * @noinstantiate This class is not intended to be instantiated by clients.
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35 */
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36 public final class UndoEdit : TextEdit {
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37
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130
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38 this() {
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129
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39 super(0, Integer.MAX_VALUE);
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40 }
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41
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130
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42 private this(UndoEdit other) {
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129
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43 super(other);
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44 }
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45
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46 /*
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47 * @see dwtx.text.edits.TextEdit#internalAdd(dwtx.text.edits.TextEdit)
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48 */
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49 void internalAdd(TextEdit child) throws MalformedTreeException {
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50 throw new MalformedTreeException(null, this, TextEditMessages.getString("UndoEdit.no_children")); //$NON-NLS-1$
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51 }
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52
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53 /*
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54 * @see dwtx.text.edits.MultiTextEdit#aboutToBeAdded(dwtx.text.edits.TextEdit)
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55 */
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56 void aboutToBeAdded(TextEdit parent) {
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57 throw new MalformedTreeException(parent, this, TextEditMessages.getString("UndoEdit.can_not_be_added")); //$NON-NLS-1$
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58 }
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59
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60 UndoEdit dispatchPerformEdits(TextEditProcessor processor) throws BadLocationException {
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61 return processor.executeUndo();
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62 }
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63
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64 void dispatchCheckIntegrity(TextEditProcessor processor) throws MalformedTreeException {
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65 processor.checkIntegrityUndo();
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66 }
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67
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68 /*
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69 * @see dwtx.text.edits.TextEdit#doCopy()
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70 */
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71 protected TextEdit doCopy() {
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72 return new UndoEdit(this);
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73 }
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74
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75 /*
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76 * @see TextEdit#accept0
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77 */
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78 protected void accept0(TextEditVisitor visitor) {
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79 bool visitChildren= visitor.visit(this);
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80 if (visitChildren) {
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81 acceptChildren(visitor);
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82 }
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83 }
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84
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85 /*
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86 * @see TextEdit#performDocumentUpdating
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87 */
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88 int performDocumentUpdating(IDocument document) throws BadLocationException {
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89 fDelta= 0;
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90 return fDelta;
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91 }
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92
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93 void add(ReplaceEdit edit) {
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94 List children= internalGetChildren();
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95 if (children is null) {
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96 children= new ArrayList(2);
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97 internalSetChildren(children);
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98 }
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99 children.add(edit);
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100 }
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101
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102 void defineRegion(int offset, int length) {
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103 internalSetOffset(offset);
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104 internalSetLength(length);
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105 }
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106
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107 bool deleteChildren() {
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108 return false;
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109 }
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110 }
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111
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