private V removeInternal()

in src/main/java/org/apache/commons/collections4/map/ConcurrentReferenceHashMap.java [1015:1054]
33 lines of code
12 McCabe index (conditional complexity)

        private V removeInternal(final Object key, final int hash, final Object value, final boolean refRemove) {
            if (!refRemove) {
                removeStale();
            }
            int c = count - 1;
            final HashEntry<K, V>[] tab = table;
            final int index = hash & tab.length - 1;
            final HashEntry<K, V> first = tab[index];
            HashEntry<K, V> e = first;
            // a ref remove operation compares the Reference instance
            while (e != null && key != e.keyRef && (refRemove || hash != e.hash || !keyEq(key, e.key()))) {
                e = e.next;
            }

            V oldValue = null;
            if (e != null) {
                final V v = e.value();
                if (value == null || value.equals(v)) {
                    oldValue = v;
                    // All entries following removed node can stay
                    // in list, but all preceding ones need to be
                    // cloned.
                    ++modCount;
                    HashEntry<K, V> newFirst = e.next;
                    for (HashEntry<K, V> p = first; p != e; p = p.next) {
                        final K pKey = p.key();
                        // Skip GC'd keys
                        if (pKey == null) {
                            c--;
                            continue;
                        }
                        newFirst = newHashEntry(pKey, p.hash, newFirst, p.value());
                    }
                    tab[index] = newFirst;
                    // write-volatile
                    count = c;
                }
            }
            return oldValue;
        }