Best Assertj code snippet using org.assertj.core.util.diff.myers.PathNode.PathNode
Source: MyersDiff.java
...51 */52 public Patch<T> diff(final List<T> original, final List<T> revised) {53 checkArgument(original != null, "original list must not be null");54 checkArgument(revised != null, "revised list must not be null");55 PathNode path;56 try {57 path = buildPath(original, revised);58 return buildRevision(path, original, revised);59 } catch (IllegalStateException e) {60 e.printStackTrace();61 return new Patch<>();62 }63 }64 /**65 * Computes the minimum diffpath that expresses de differences66 * between the original and revised sequences, according67 * to Gene Myers differencing algorithm.68 *69 * @param orig The original sequence.70 * @param rev The revised sequence.71 * @return A minimum {@link PathNode Path} across the differences graph.72 * @throws IllegalStateException if a diff path could not be found.73 */74 public PathNode buildPath(final List<T> orig, final List<T> rev) {75 checkArgument(orig != null, "original sequence is null");76 checkArgument(rev != null, "revised sequence is null");77 // these are local constants78 final int N = orig.size();79 final int M = rev.size();80 final int MAX = N + M + 1;81 final int size = 1 + 2 * MAX;82 final int middle = size / 2;83 final PathNode diagonal[] = new PathNode[size];84 diagonal[middle + 1] = new Snake(0, -1, null);85 for (int d = 0; d < MAX; d++) {86 for (int k = -d; k <= d; k += 2) {87 final int kmiddle = middle + k;88 final int kplus = kmiddle + 1;89 final int kminus = kmiddle - 1;90 PathNode prev;91 int i;92 if ((k == -d) || (k != d && diagonal[kminus].i < diagonal[kplus].i)) {93 i = diagonal[kplus].i;94 prev = diagonal[kplus];95 } else {96 i = diagonal[kminus].i + 1;97 prev = diagonal[kminus];98 }99 diagonal[kminus] = null; // no longer used100 int j = i - k;101 PathNode node = new DiffNode(i, j, prev);102 // orig and rev are zero-based103 // but the algorithm is one-based104 // that's why there's no +1 when indexing the sequences105 while (i < N && j < M && equals(orig.get(i), rev.get(j))) {106 i++;107 j++;108 }109 if (i > node.i) node = new Snake(i, j, node);110 diagonal[kmiddle] = node;111 if (i >= N && j >= M) return diagonal[kmiddle];112 }113 diagonal[middle + d - 1] = null;114 }115 // According to Myers, this cannot happen116 throw new IllegalStateException("could not find a diff path");117 }118 private boolean equals(T orig, T rev) {119 return equalizer.equals(orig, rev);120 }121 /**122 * Constructs a {@link Patch} from a difference path.123 *124 * @param path The path.125 * @param orig The original sequence.126 * @param rev The revised sequence.127 * @return A {@link Patch} script corresponding to the path.128 */129 public Patch<T> buildRevision(PathNode path, List<T> orig, List<T> rev) {130 checkArgument(path != null, "path is null");131 checkArgument(orig != null, "original sequence is null");132 checkArgument(rev != null, "revised sequence is null");133 Patch<T> patch = new Patch<>();134 if (path.isSnake())135 path = path.prev;136 while (path != null && path.prev != null && path.prev.j >= 0) {137 checkState(!path.isSnake(), "bad diffpath: found snake when looking for diff");138 int i = path.i;139 int j = path.j;140 path = path.prev;141 int ianchor = path.i;142 int janchor = path.j;143 Chunk<T> original = new Chunk<>(ianchor, copyOfRange(orig, ianchor, i));...
PathNode
Using AI Code Generation
1import org.assertj.core.util.diff.myers.*;2import java.util.*;3public class ShortestEditScript {4 public static void main(String[] args) {5 String[] s1 = {"a", "b", "c", "a", "b", "c"};6 String[] s2 = {"a", "c", "b", "c", "a", "b", "c"};7 List<Delta<String>> delta = MyersDiff.computeDiff(Arrays.asList(s1), Arrays.asList(s2));8 PathNode path = PathNode.buildPath(delta);9 System.out.println(path.getPath());10 }11}12import java.util.*;13public class PathNode {14 private final Delta<String> delta;15 private final List<PathNode> children = new ArrayList<PathNode>();16 private int length;17 public PathNode(Delta<String> delta) {18 this.delta = delta;19 }20 public void addChild(PathNode child) {21 children.add(child);22 }23 public Delta<String> getDelta() {24 return delta;25 }26 public List<PathNode> getChildren() {27 return children;28 }29 public int getLength() {30 return length;31 }32 public void setLength(int length) {33 this.length = length;34 }35 public static PathNode buildPath(List<Delta<String>> delta) {36 PathNode root = new PathNode(null);37 root.setLength(0);38 PathNode current = root;39 for (Delta<String> d : delta) {40 PathNode node = new PathNode(d);41 current.addChild(node);42 current = node;43 }44 root.computeLength();45 return root;46 }47 private int computeLength()
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