[ringojs] Creating a ByteString from a bytes array.

[George Moschovitis]

In narwhal I am using this hack to initialize a ByteString:

var bytes = <java byte[]>;

var ByteString = require("binary").ByteString;

var b = new ByteString();
b._bytes = bytes;
b._offset = 0;
b._length = Number(b._bytes.length);

How can I accomplish something similar in RingoJS? Is there a standard
CommonJS way to achieve this?

-g.

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[Hannes Wallnoefer]

2010/5/7 George Moschovitis <george.mo...@gmail.com>:

> In narwhal I am using this hack to initialize a ByteString:
>
> var bytes = <java byte[]>;
>
> var ByteString = require("binary").ByteString;
>
> var b = new ByteString();
> b._bytes = bytes;
> b._offset = 0;
> b._length = Number(b._bytes.length);
>
> How can I accomplish something similar in RingoJS? Is there a standard
> CommonJS way to achieve this?

In ringojs, you just do:

var b = new ByteString(bytes);

or, if you explicitly don't want the byte array to be copied (but then
changing the underlying byte[] would break the "immutability contract"
of ByteString):

var b = ByteString.wrap(byte);

also, you can pass a ByteString or ByteArray into any Java method
taking a byte[], it will automatically be unwrapped.

I don't think there's a standard CommonJS way to do this since byte[]
is inherently Java-specific. It would be nice to have a common way of
doing this between ringojs and narwhal/rhino, though.

Hannes

[George Moschovitis]

> In  ringojs, you just do:
>
> var b = new ByteString(bytes);

> var b = ByteString.wrap(byte);

perfect!

> also, you can pass a ByteString or ByteArray into any Java method
> taking a byte[], it will automatically be unwrapped.

cool, I am wondering how this is implemented...

> It would be nice to have a common way of doing this between ringojs and narwhal/rhino, though.

yeah, more cooperation between narwhal/ringo and ringojs would be
great.

regards,