package treeops

import "github.com/elliotchance/orderedmap"

func UnionOperator(d *dataTreeNavigator, matchingNodes *orderedmap.OrderedMap, pathNode *PathTreeNode) (*orderedmap.OrderedMap, error) {
	lhs, err := d.getMatchingNodes(matchingNodes, pathNode.Lhs)
	if err != nil {
		return nil, err
	}
	rhs, err := d.getMatchingNodes(matchingNodes, pathNode.Rhs)
	if err != nil {
		return nil, err
	}
	for el := rhs.Front(); el != nil; el = el.Next() {
		node := el.Value.(*CandidateNode)
		lhs.Set(node.GetKey(), node)
	}
	return lhs, nil
}