Two implementations of an Iterator of raw BSON documents

DocumentSequence.java

// This implemenation iterates over a document sequence as returned by OP_QUERY or by OP_MSG in the future
class RawBsonDocumentSequenceIterator implements Iterator<RawBsonDocument> {

    private final ByteBuffer documentSequence;

    public RawBsonDocumentSequenceIterator(final ByteBuffer documentSequence) {
        this.documentSequence = documentSequence;
    }

    @Override
    public boolean hasNext() {
        return documentSequence.hasRemaining();
    }

    @Override
    public RawBsonDocument next() {
        ByteBuffer slice = documentSequence.slice();
        slice.order(ByteOrder.LITTLE_ENDIAN);
        int size = slice.getInt(0);
        slice.limit(size);
        return new RawBsonDocument(slice);
    }
}

// This implementation iterates over a raw BSON array of documents.  The RawBsonArray takes care of skipping over the document keys
class RawBsonArrayIterator implements Iterator<RawBsonDocument> {

    final Iterator<BsonValue> wrapped;

    public RawBsonArrayIterator(final RawBsonArray rawBsonArray) {
        wrapped = rawBsonArray.iterator();
    }


    @Override
    public boolean hasNext() {
        return wrapped.hasNext();
    }

    @Override
    public RawBsonDocument next() {
        return (RawBsonDocument) wrapped.next();
    }
}