public ValueExpression setVariable(String name, ValueExpression expression)
    {
        if (_vars == null)
        {
            _vars = new HashMap<String, ValueExpression>();
        }
        
        return _vars.put(name, expression);
    }
public ValueExpression setVariable ( String name , ValueExpression expression ) { if ( _vars == null ) { _vars = new HashMap < String , ValueExpression > ( ) ; } return _vars . put ( name , expression ) ; }
@see javax.el.VariableMapper#setVariable(java.lang.String, javax.el.ValueExpression)