protected boolean fetch()

in hugegraph-common/src/main/java/org/apache/hugegraph/iterator/ExtendableIterator.java [72:97]

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

    protected boolean fetch() {
        assert this.current == none();
        if (this.itors.isEmpty()) {
            return false;
        }

        if (this.currentIterator != null && this.currentIterator.hasNext()) {
            this.current = this.currentIterator.next();
            return true;
        }

        Iterator<T> first;
        while ((first = this.itors.peekFirst()) != null && !first.hasNext()) {
            if (first == this.itors.peekLast() && this.itors.size() == 1) {
                this.currentIterator = first;
                // The last one
                return false;
            }
            close(this.itors.removeFirst());
        }

        assert first != null && first.hasNext();
        this.currentIterator = first;
        this.current = this.currentIterator.next();
        return true;
    }