ValueIterator Class — netty Architecture

Source Code

codec-base/src/main/java/io/netty/handler/codec/DefaultHeaders.java lines 1331–1381

    private final class ValueIterator implements Iterator<V> {
        private final K name;
        private final int hash;
        private HeaderEntry<K, V> removalPrevious;
        private HeaderEntry<K, V> previous;
        private HeaderEntry<K, V> next;

        ValueIterator(K name) {
            this.name = checkNotNull(name, "name");
            hash = hashingStrategy.hashCode(name);
            calculateNext(entries[index(hash)]);
        }

        @Override
        public boolean hasNext() {
            return next != null;
        }

        @Override
        public V next() {
            if (!hasNext()) {
                throw new NoSuchElementException();
            }
            if (previous != null) {
                removalPrevious = previous;
            }
            previous = next;
            calculateNext(next.next);
            return previous.value;
        }

        @Override
        public void remove() {
            if (previous == null) {
                throw new IllegalStateException();
            }
            removalPrevious = remove0(previous, removalPrevious);
            previous = null;
        }

        private void calculateNext(HeaderEntry<K, V> entry) {
            while (entry != null) {
                if (entry.hash == hash && hashingStrategy.equals(name, entry.key)) {
                    next = entry;
                    return;
                }
                entry = entry.next;
            }
            next = null;
        }
    }