Specifies that a user-defined Java method (non-abstract) method in a DTF file can be invoked from queries (written in the XQuery language).
In the following example, the @dtf:xquery-function annotation defines that the Java method calculateTotalPrice that can be invoked from a query during run time:
/** * @dtf:xquery-function */ public float calculateTotalPrice(float taxRate, int quantity, float price, boolean fillOrder) { float totalTax, costNoTax, totalCost; if (fillOrder) { // Calculate the total tax totalTax = taxRate * quantity * price; // Calculate the total cost without tax costNoTax = quantity * price; // Add the tax and the cost to get the total cost totalCost = totalTax + costNoTax; } else { totalCost = 0; } return totalCost; }
See "Invoking Functions or Operators in a Query" in Modifying Links Using the Target Expression Tab in the Guide to Data Transformation.
See "Create a User-Defined Java Method to Invoke From the Join Query" in Step 4: Mapping Repeating Elements—Creating a Join in the Tutorial: Building Your First Data Transformation.