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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 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.jface.text.reconciler.DirtyRegion;
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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 dwtx.jface.text.ITypedRegion;
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18
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19
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20 /**
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21 * A dirty region describes a document range which has been changed.
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22 */
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23 public class DirtyRegion : ITypedRegion {
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24
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25 /**
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26 * Identifies an insert operation.
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27 */
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28 final static public String INSERT= "__insert"; //$NON-NLS-1$
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29 /**
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30 * Identifies a remove operation.
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31 */
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32 final static public String REMOVE= "__remove"; //$NON-NLS-1$
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33
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34 /** The region's offset. */
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35 private int fOffset;
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36 /** The region's length. */
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37 private int fLength;
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38 /** Indicates the type of the applied change. */
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39 private String fType;
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40 /** The text which has been inserted. */
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41 private String fText;
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42
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43 /**
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44 * Creates a new dirty region.
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45 *
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46 * @param offset the offset within the document where the change occurred
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47 * @param length the length of the text within the document that changed
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48 * @param type the type of change that this region represents: {@link #INSERT} {@link #REMOVE}
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49 * @param text the substitution text
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50 */
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51 public DirtyRegion(int offset, int length, String type, String text) {
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52 fOffset= offset;
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53 fLength= length;
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54 fType= normalizeTypeValue(type);
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55 fText= text;
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56 }
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57
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58 /**
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59 * Computes the normalized type value to ensure that the implementation can use object identity rather
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60 * than equality.
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61 *
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62 * @param type the type value
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63 * @return the normalized type value or <code>null</code>
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64 * @since 3.1
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65 */
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66 private String normalizeTypeValue(String type) {
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67 if (INSERT.equals(type))
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68 return INSERT;
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69 if (REMOVE.equals(type))
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70 return REMOVE;
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71 return null;
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72 }
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73
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74 /*
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75 * @see ITypedRegion#getOffset()
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76 */
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77 public int getOffset() {
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78 return fOffset;
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79 }
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80
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81 /*
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82 * @see ITypedRegion#getLength()
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83 */
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84 public int getLength() {
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85 return fLength;
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86 }
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87
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88 /*
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89 * @see ITypedRegion#getType
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90 */
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91 public String getType() {
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92 return fType;
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93 }
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94
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95 /**
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96 * Returns the text that changed as part of the region change.
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97 *
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98 * @return the changed text
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99 */
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100 public String getText() {
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101 return fText;
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102 }
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103
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104 /**
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105 * Modify the receiver so that it encompasses the region specified by the dirty region.
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106 *
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107 * @param dr the dirty region with which to merge
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108 */
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109 void mergeWith(DirtyRegion dr) {
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110 int start= Math.min(fOffset, dr.fOffset);
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111 int end= Math.max(fOffset + fLength, dr.fOffset + dr.fLength);
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112 fOffset= start;
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113 fLength= end - start;
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114 fText= (dr.fText is null ? fText : (fText is null) ? dr.fText : fText + dr.fText);
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115 }
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116 }
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