copied the the same code but getting this error
type arguments [_] do not conform to trait MetaMapper's type parameter
bounds [A <: net.liftweb.mapper.Mapper[A]] TravelMerchantTest/src/main/
scala/com/vtech/travelmerchant/snippet default.scala line 142
1239284830763 85593
Actually I am trying to make the JSON object using a mapper object. My
function is this :
def getJSONStringGeneric(anyObject :Any):NodeSeq = {
//Console.println("anyObject.getClass ::::::::
"+anyObject.getClass);
//Console.println("anyObject.getClass.getName ::::::::
"+anyObject.getClass.getName);
//var objTemp = anyObject.asInstanceOf[MetaMapper
[TestGearLogin]];
var sJSONString = "{\"bindings\": [";
anyObject match {
case mm: MetaMapper[_] =>
mm.findAll.map(
(userdetails: Mapper[_]) =>{
var tempJSON = "";
val ret = new StringBuilder
ret.append("{")
ret.append(userdetails.getSingleton.appendFieldToStrings
(userdetails))
ret.append("}")
// ret will be like
{username=222,password=222,audit_dt=2009-04-06
00:00:00.0,login_pid=26}
tempJSON = ret.toString();
tempJSON = tempJSON.replaceAll("\\{","\\{\"");
tempJSON = tempJSON.replaceAll("\\}","\"\\}");
tempJSON = tempJSON.replaceAll("=","\":\"");
tempJSON = tempJSON.replaceAll("," , "\",\"");
tempJSON += ",";
sJSONString +=tempJSON
}
)
}
sJSONString = sJSONString.substring(0,sJSONString.length-1); //
for slicing the last comma
sJSONString += "]}";
Text(sJSONString);
}
but not getting a way of doing this. Please advise.
Thanks
Amit Kumar Verma
On Apr 9, 6:14 pm, David Pollak <feeder.of.the.be...@gmail.com> wrote:
> Howdy,
> Scala is a static language, so the class for casting must be known at
> compile time. It's not possible to construct a String at runtime and cast
> an object into a class represented by that String.
>
> However, casting to a known class is easy in Scala... and it's done
> primarily using pattern matching. The following code:
>
> def foo(in: Any) = in match {
> case mm: MetaMapper[_] =>
> mm.findAll.map(
> (m: Mapper[_]) =>
> m.asJs
> )
> case _ =>
> }
>
> Does what I think you want. It takes an incoming instance, in and matches
> it against being an instance of MetaMapper[_]. This means its some type of
> MetaMapper (we don't know or care what the type parameter is). If it is a
> MetaMapper, it's assigned to the mm variable. We can then call findAll on
> that variable and we have a bunch of Mapper[_] instances. Note that I
> explicitly called out the type of m in the function, but that line could be
> re-written mm.findAll.map(m => m.asJs) because the compiler infers the type
> of m.
>
> Does this help?
>
> Thanks,
>
> David
>
> On Thu, Apr 9, 2009 at 3:55 AM, Amit Kumar Verma <cdac.a...@gmail.com>wrote:
>
>
>
>
>
> > Hi All,
>
> > I am trying to type cast an scala object to its mapper object
>
> > 1 def getJSONString(anyObject :Object):NodeSeq = {
>
> > 2 var obj = anyObject.asInstanceOf[anyObject.getClass
> > ().getName()];
>
> > 3 obj.findAll.map(userdetails => {
> > // some code will go here
> > }
> > Text("any string")
> > }
>
> > but i am getting erroe as "expected [ but found (" on line 2.
>
> > please help me to typecast the object to its mapper object.
>
> > Thanks
> > Amit Kumar Verma
>
> --
> Lift, the simply functional web frameworkhttp://liftweb.net
> Beginning Scalahttp://www.apress.com/book/view/1430219890
> Follow me:http://twitter.com/dpp
> Git some:http://github.com/dpp
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