V remove()

in bytekit-core/src/main/java/com/alibaba/bytekit/utils/concurrent/ConcurrentWeakKeyHashMap.java [564:608]
40 lines of code
12 McCabe index (conditional complexity)

        V remove(Object key, int hash, Object value, boolean refRemove) {
            lock();
            try {
                if (!refRemove) {
                    removeStale();
                }
                int c = count - 1;
                HashEntry<K, V>[] tab = table;
                int index = hash & tab.length - 1;
                HashEntry<K, V> first = tab[index];
                HashEntry<K, V> e = first;
                // a reference 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) {
                    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) {
                            K pKey = p.key();
                            if (pKey == null) { // Skip GC'd keys
                                c --;
                                continue;
                            }

                            newFirst = newHashEntry(
                                    pKey, p.hash, newFirst, p.value());
                        }
                        tab[index] = newFirst;
                        count = c; // write-volatile
                    }
                }
                return oldValue;
            } finally {
                unlock();
            }
        }