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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 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.TextEditCopier;
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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.HashMap;
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19 import java.util.Iterator;
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20 import java.util.List;
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21 import java.util.Map;
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22
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23 import dwtx.core.runtime.Assert;
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24
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25
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26 /**
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27 * Copies a tree of text edits. A text edit copier keeps a map
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28 * between original and new text edits. It can be used to map
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29 * a copy back to its original edit.
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30 *
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31 * @since 3.0
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32 */
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33 public final class TextEditCopier {
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34
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35 private TextEdit fEdit;
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36 private Map fCopies;
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37
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38 /**
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39 * Constructs a new <code>TextEditCopier</code> for the
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40 * given edit. The actual copy is done by calling <code>
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41 * perform</code>.
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42 *
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43 * @param edit the edit to copy
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44 *
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45 * @see #perform()
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46 */
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47 public TextEditCopier(TextEdit edit) {
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48 super();
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49 Assert.isNotNull(edit);
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50 fEdit= edit;
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51 fCopies= new HashMap();
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52 }
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53
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54 /**
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55 * Performs the actual copying.
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56 *
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57 * @return the copy
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58 */
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59 public TextEdit perform() {
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60 TextEdit result= doCopy(fEdit);
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61 if (result !is null) {
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62 for (Iterator iter= fCopies.keySet().iterator(); iter.hasNext();) {
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63 TextEdit edit= (TextEdit)iter.next();
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64 edit.postProcessCopy(this);
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65 }
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66 }
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67 return result;
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68 }
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69
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70 /**
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71 * Returns the copy for the original text edit.
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72 *
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73 * @param original the original for which the copy
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74 * is requested
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75 * @return the copy of the original edit or <code>null</code>
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76 * if the original isn't managed by this copier
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77 */
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78 public TextEdit getCopy(TextEdit original) {
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79 Assert.isNotNull(original);
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80 return (TextEdit)fCopies.get(original);
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81 }
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82
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83 //---- helper methods --------------------------------------------
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84
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85 private TextEdit doCopy(TextEdit edit) {
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86 TextEdit result= edit.doCopy();
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87 List children= edit.internalGetChildren();
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88 if (children !is null) {
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89 List newChildren= new ArrayList(children.size());
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90 for (Iterator iter= children.iterator(); iter.hasNext();) {
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91 TextEdit childCopy= doCopy((TextEdit)iter.next());
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92 childCopy.internalSetParent(result);
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93 newChildren.add(childCopy);
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94 }
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95 result.internalSetChildren(newChildren);
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96 }
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97 addCopy(edit, result);
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98 return result;
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99 }
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100
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101 private void addCopy(TextEdit original, TextEdit copy) {
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102 fCopies.put(original, copy);
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103 }
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104 }
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