returns the last transformtreenode on the stack . concode_field_sep Deque<TransformTreeNode> transformStack concode_elem_sep Map<PInput,TransformTreeNode> producingTransformNode concode_field_sep void popNode concode_elem_sep void pushNode concode_elem_sep void addInput concode_elem_sep void visit concode_elem_sep void setOutput
TransformTreeNode function ( ) { return transformStack . peek ( ) ; }