private ConcurrentReferenceHashMap()

in src/main/java/org/apache/commons/collections4/map/ConcurrentReferenceHashMap.java [1439:1472]

• 33 lines of code
• 11 McCabe index (conditional complexity)

    private ConcurrentReferenceHashMap(int initialCapacity, final float loadFactor, int concurrencyLevel, final ReferenceType keyType,
            final ReferenceType valueType, final EnumSet<Option> options) {
        if (!(loadFactor > 0) || initialCapacity < 0 || concurrencyLevel <= 0) {
            throw new IllegalArgumentException();
        }
        if (concurrencyLevel > MAX_SEGMENTS) {
            concurrencyLevel = MAX_SEGMENTS;
        }
        // Find power-of-two sizes best matching arguments
        int sshift = 0;
        int ssize = 1;
        while (ssize < concurrencyLevel) {
            ++sshift;
            ssize <<= 1;
        }
        segmentShift = 32 - sshift;
        segmentMask = ssize - 1;
        this.segments = Segment.newArray(ssize);
        if (initialCapacity > MAXIMUM_CAPACITY) {
            initialCapacity = MAXIMUM_CAPACITY;
        }
        int c = initialCapacity / ssize;
        if (c * ssize < initialCapacity) {
            ++c;
        }
        int cap = 1;
        while (cap < c) {
            cap <<= 1;
        }
        identityComparisons = options != null && options.contains(Option.IDENTITY_COMPARISONS);
        for (int i = 0; i < this.segments.length; ++i) {
            this.segments[i] = new Segment<>(cap, loadFactor, keyType, valueType, identityComparisons);
        }
    }