I am attempting to interop to this simple scala code, but am having some troubles.
package indicators
class DoubleRingBuffer(val capacity:Int=1000) {
var elements = new Array[Double](capacity);
private var head=capacity-1
private var max=0
def size ():Int = {
return max+1
}
def add(obj:Double):Double = {
head-=1
if (head<0) head=capacity-1
return set(max+1,obj)
}
def set(i:Int,obj:Double):Double = {
System.out.println("HI")
if (i>=capacity || i<0)
throw new IndexOutOfBoundsException(i+" out of bounds")
if (i>=max) max=i
var index = (head+i)%capacity
var prev = elements(index)
elements(index)=obj
return prev
}
def get(i:Int=0):Double = {
System.out.println("size is "+size())
if (i>=size() || i<0)
throw new IndexOutOfBoundsException(i+" out of bounds")
var index = (head+i)%capacity
return elements(index)
}
}
In clojure, i do this
(import 'indicators.DoubleRingBuffer)
(def b (DoubleRingBuffer. 100))
(pr (.size b)) ;;ERROR: No matching field found: size for class indicators.DoubleRingBuffer
(pr (.get b 33)) ;;returns 0: should throw an index out of bounds error!
(pr (.get b 100)) ;;throws index out of bounds error, as it should
In addition, i do not get any output to the console! Testing this code using scala works as expected. Whats going on here and how can i fix it so that clojure can use the scala code?
Try these in REPL:
(class b) will probably tell you it's indicators.DoubleRingBuffer.
(vec (.getDeclaredMethods (class b))) will give you a vector of all methods declared in your class as if it was a Java class, so you can see their signatures.
Now, call your methods as seen in the signatures, with these method names and parameters.
I have a feeling the problem is in Scala's dealing with default value for method parameter.
EDIT: As OP described in a comment, it isn't.
If that doesn't work you can try to decompile your Scala bytecode to Java to find out how does DoubleRingBuffer class look like.
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