rJava (version 0.9-9)

aslist: Converts java objects or arrays to R lists

Description

as.list is implemented for java objects and java arrays to facilitate using lapply calls over elements of a java array or items of an Iterator associated with an Iterable object

For java array references, as.list is mapped to .jevalArray

For java objects that implement the Iterable interface, the list is created by iterating over the associated iterator

Usage

# S3 method for jobjRef
as.list(x, ...)
# S3 method for jarrayRef
as.list(x, ...)

Arguments

x

java array or Iterable java object

…

ignored

Value

An R list, or vector.

See Also

.jevalArray, lapply

Examples

# NOT RUN {
  # lapplying over a java array
  a <- .jarray( list( 
	.jnew( "java/awt/Point", 10L, 10L ), 
	.jnew( "java/awt/Point", 30L, 30L )
  ) )
  lapply( a, function(point){ 
	with(point, { 
		(x + y ) ^ 2
	} )
  } )

# lapply over a Vector (implements Iterable)
v <- .jnew("java/util/Vector")
v$add( "foo" )
v$add( .jnew("java/lang/Double", 10.2 ) )
sapply( v, function(item) item$getClass()$getName() )

# }