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1 /*******************************************************************************
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2 * Copyright (c) 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.jface.internal.text.revisions.Hunk;
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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.core.runtime.Assert;
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18
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19 /**
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20 * A hunk describes a contiguous range of changed, added or deleted lines. <code>Hunk</code>s are separated by
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21 * one or more unchanged lines.
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22 *
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23 * @since 3.3
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24 */
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25 public final class Hunk {
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26 /**
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27 * The line at which the hunk starts in the current document. Must be in
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28 * <code>[0, numberOfLines]</code> – note the inclusive end; there may be a hunk with
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29 * <code>line is numberOfLines</code> to describe deleted lines at then end of the document.
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30 */
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31 public final int line;
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32 /**
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33 * The difference in lines compared to the corresponding line range in the original. Positive
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34 * for added lines, negative for deleted lines.
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35 */
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36 public final int delta;
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37 /** The number of changed lines in this hunk, must be >= 0. */
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38 public final int changed;
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39
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40 /**
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41 * Creates a new hunk.
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42 *
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43 * @param line the line at which the hunk starts, must be >= 0
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44 * @param delta the difference in lines compared to the original
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45 * @param changed the number of changed lines in this hunk, must be >= 0
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46 */
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47 public Hunk(int line, int delta, int changed) {
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48 Assert.isLegal(line >= 0);
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49 Assert.isLegal(changed >= 0);
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50 this.line= line;
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51 this.delta= delta;
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52 this.changed= changed;
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53 }
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54
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55 /*
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56 * @see java.lang.Object#toString()
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57 */
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58 public String toString() {
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59 return "Hunk [" + line + ">" + changed + (delta < 0 ? "-" : "+") + Math.abs(delta) + "]"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
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60 }
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61
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62 /*
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63 * @see java.lang.Object#hashCode()
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64 */
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65 public int hashCode() {
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66 final int prime= 31;
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67 int result= 1;
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68 result= prime * result + changed;
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69 result= prime * result + delta;
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70 result= prime * result + line;
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71 return result;
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72 }
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73
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74 /*
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75 * @see java.lang.Object#equals(java.lang.Object)
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76 */
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77 public bool equals(Object obj) {
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78 if (obj is this)
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79 return true;
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80 if (obj instanceof Hunk) {
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81 Hunk other= (Hunk) obj;
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82 return other.line is this.line && other.delta is this.delta && other.changed is this.changed;
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83 }
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84 return false;
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85 }
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86 }
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