Re: using value conversion/factory to encode objects in blobs
Re: using value conversion/factory to encode objects in blobs
- Subject: Re: using value conversion/factory to encode objects in blobs
- From: "email@hidden" <email@hidden>
- Date: Sat, 25 Feb 2017 18:56:34 +0100
Thanks! But... sorry for me being stupid, but where do I find them? Google can't find the former at all suggesting I really wanted “blood dictionary”; as for the latter, there's the opposite problem -- zillions of hits, among which the proper one _might perhaps_ be hidden somewhere...
All the best,
OC
> On 25. 2. 2017, at 6:32 PM, George Domurot <email@hidden> wrote:
>
> Use the Prototype of blodDictionary or mutableDictionary to do the heavy lifting for you.
>
> -G
>
>
>> On Feb 25, 2017, at 8:19 AM, email@hidden wrote:
>>
>> Hi there,
>>
>> this must be WebObjects 101 and I must be blind as a bat, but ... how on earth does one use the value conversion/factory model support to represent e.g., an attribute containing an NSDictionary (or another custom data object) by a BLOB containing archived data?
>>
>> Far as I understand the support, I specify the desired EO-side class, plus an instance method to archive it to NSData, plus a class method (in Javaspeak presumably a static one) to initialise an instance from NSData. But... there are no such methods far as I know for most data classes. E.g., I would need something like
>>
>> class NSDictionary ... {
>> static NSDictionary theMethodToBeUsedForValueFactory(NSData data) {
>> ByteArrayInputStream bis=new ByteArrayInputStream(data.bytes())
>> ObjectInputStream is=new ObjectInputStream(bis)
>> return objectInputStream.readObject()
>> }
>> NSData theMethodToBeUsedForValueConversion() {
>> ByteArrayOutputStream bos=new ByteArrayOutputStream();
>> ObjectOutputStream os=new ObjectOutputStream(bos)
>> os.writeObject(this)
>> os.flush()
>> return new NSData(bos.toByteArray())
>> }
>> }
>>
>> none of which, far as I know, actually exists. In Objective C the solution would be trivial, I would simply add appropriate methods through a category; but the bloody Java thing has no similar support.
>>
>> What am I missing and how does one solve this?
>>
>> Thanks a lot,
>> OC
>>
>>
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