private Double calculateJaccardSimilarity()

in src/main/java/org/apache/commons/text/similarity/JaccardSimilarity.java [69:90]

• 22 lines of code
• 7 McCabe index (conditional complexity)

    private Double calculateJaccardSimilarity(final CharSequence left, final CharSequence right) {
        final int leftLength = left.length();
        final int rightLength = right.length();
        if (leftLength == 0 && rightLength == 0) {
            return 1d;
        }
        if (leftLength == 0 || rightLength == 0) {
            return 0d;
        }
        final Set<Character> leftSet = new HashSet<>();
        for (int i = 0; i < leftLength; i++) {
            leftSet.add(left.charAt(i));
        }
        final Set<Character> rightSet = new HashSet<>();
        for (int i = 0; i < rightLength; i++) {
            rightSet.add(right.charAt(i));
        }
        final Set<Character> unionSet = new HashSet<>(leftSet);
        unionSet.addAll(rightSet);
        final int intersectionSize = leftSet.size() + rightSet.size() - unionSet.size();
        return 1.0d * intersectionSize / unionSet.size();
    }