public OperandExpression(final INaviOperandTreeNode node){
  m_node=Preconditions.checkNotNull(node,"Error: Node argument can't be null");
  for (  final IReference reference : m_node.getReferences()) {
    m_references.add(new Reference(reference));
  }
  m_node.addListener(m_internalListener);
}

public OperandExpression ( final INaviOperandTreeNode node ) { m_node = Preconditions . checkNotNull ( node , "Error: Node argument can't be null" ) ; for ( final IReference reference : m_node . getReferences ( ) ) { m_references . add ( new Reference ( reference ) ) ; } m_node . addListener ( m_internalListener ) ; }
creates a new operand expression object .
