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import nuke

import IECoreNuke
from . import _IECoreNuke

class FnOpHolder( IECoreNuke.FnParameterisedHolder ) :

	def __init__( self, node ) :

		IECoreNuke.FnParameterisedHolder.__init__( self, node )

	def setOp( self, className, classVersion=None ) :

		self.setParameterised( className, classVersion, "IECORE_OP_PATHS" )

	def getOp( self ) :

		return self.getParameterised()[0]

	## Executes the node, returning the result of the Op. You may also
	# use nuke.execute() directly on an OpHolder node, but in this case
	# the result is not returned (which you might not need).
	def execute( self ) :

		nuke.execute( self.node(), nuke.frame(), nuke.frame() )
		return _IECoreNuke._opHolderExecuteResult()

	@staticmethod
	def create( nodeName, className, classVersion=None ) :

		node = nuke.createNode( "ieOp" )
		node.setName( nodeName )
		fnOH = FnOpHolder( node )
		fnOH.setOp( className, classVersion )

		return fnOH
