public ExpressionType getExpressionType ( ) { try { //TODO: cache expression type ? final ExpressionType expressionType = node . firstChildAccept ( new ExpressionTypeEvaluationVisitor ( ) , null ) ; return expressionType ; } catch ( IllegalArgumentException e ) { throw new IllegalArgumentException ( "Please report this bug: Can not determine type of XPath:" + xpath , e ) ; } }
Calculates the return type of the expression .