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Cumulative Functoids

  • Artikkeli

Overview

Cumulative functoids reduce a series of values to a single value such as a sum, a concatenated string, or an average.

All Cumulative functoids accept two input parameters:

  1. The value to accumulate. This value is numeric for all Cumulative functoids except the Cumulative Concatenate functoid which expects a string value. The value is a link, often from a Field Attribute, Field Element, or Record node (with its Mixed property set to True).

    Note

    If none of the ancestor Record nodes in the schema tree are looping, using a Cumulative functoid is unnecessary.

  2. The scope within which the value is accumulated. This argument is optional. The argument indicates how closely related the specified values must be to be accumulated.

    The following table shows the values for the scoping parameter and its effect:

Scoping Parameter Value Effect
0 (zero) Accumulate the value over the entire instance message. The default.
1 (one) Accumulate the value of element or attribute values with the same parent element.
2 Accumulate the value of element or attribute values with the same grandparent element.
3 or greater Accumulate the value of element or attribute values of progressively wider scope following the preceding pattern (great-grandparent, great-great-grandparent, etc.).

Example

An example of using a Cumulative functoid might be summing costs across a purchase order. The following code is an example of a purchase order.

<ns0:PurchaseOrder xmlns:ns0="http://CumulativeFunctoid.PurchaseOrder">  
    <From>Kevin F. Browne</From>  
    <To>Northwind Traders</To>  
    <LineItems>  
        <Item>  
            <Product>Laptop Computer</Product>  
            <Description>Thin profile laptop</Description>  
            <Price>1999.95</Price>  
            <Quantity>1</Quantity>  
        </Item>  
        <Item>  
            <Product>Monitor Swipes</Product>  
            <Description>Disposable monitor swipes</Description>  
            <Price>3.95</Price>  
            <Quantity>10</Quantity>  
        </Item>  
    </LineItems>  
</ns0:PurchaseOrder>

The Max Occurs property for the Item record would, of course, be unbounded. This indicates that the item record loops, and BizTalk Mapper compiles this record as a loop.

The following figure shows a map using a Multiplication functoid and a Cumulative Sum functoid to aggregate item records from an incoming purchase order and output the results in the POTotal field:

Map showing usage of the cumulative sum functoid.

The map produces the following output with the preceding data and with the default scoping parameter value, 0 (zero):

<ns0:SummedPO xmlns:ns0="http://CumulativeFunctoid.SummedPO">  
    <From>Kevin F. Browne</From>  
    <To>Northwind Traders</To>  
    <POTotal>2039.45</POTotal>  
</ns0:SummedPO>

In this example, all the Item records under the LineItems record participate in the accumulation—the default for the scoping parameter indicates accumulating the values across the entire message. The Price and Quantity fields are sent to a Multiplication functoid. The output of the Multiplication functoid becomes the input to the Cumulative Sum functoid. The output of the Cumulative Sum functoid is the accumulated value as the Item records are traversed in the input purchase order.

Note

The cumulative aggregation of input takes place over the parent record from which the input link originates. Even when the Cumulative functoid gets its input from another functoid, the cumulative aggregation takes place over the parent record of the input links to the functoid that serves as input to the Cumulative functoid.

Changing the scoping parameter to 1 (one) and modifying the output schema slightly, yields output like the following:

<ns0:SummedPO xmlns:ns0="http://CumulativeFunctoid.SummedPO">  
    <From>Kevin F. Browne</From>  
    <To>Northwind Traders</To>  
    <ItemTotal>1999.95</ItemTotal>  
    <ItemTotal>39.5</ItemTotal>  
</ns0:SummedPO>

Setting the scoping parameter to 1 (one) indicates accumulating values for elements or attributes with the same parent. Here the Price and Quantity fields have Item as a parent so that the functoid sums values for each individual Item.

If the scoping parameter is 2, the functoid accumulates values for elements or attributes with the same grandparent. The grandparent of the Price and Quantity fields is the LineItems record. Because there is only one LineItems record in the instance message, the result is the same as using the default value:

<ns0:SummedPO xmlns:ns0="http://CumulativeFunctoid.SummedPO">  
    <From>Kevin F. Browne</From>  
    <To>Northwind Traders</To>  
    <POTotal>2039.45</POTotal>  
</ns0:SummedPO>

Note

Cumulative functoids (except for the Cumulative String functoid) ignore non-numeric input. For example, an input value of "three" is ignored.

The Cumulative Average, Cumulative Minimum, and Cumulative Maximum functoids behave similarly to the Cumulative Sum functoid. The Cumulative String concatenates strings rather than aggregating numeric values.

Available functoids

The Cumulative functoids are:

  • Cumulative Average
  • Cumulative Concatenate
  • Cumulative Maximum
  • Cumulative Minimum
  • Cumulative Sum

More details on these functoids are in the UI guidance and developers API namespace reference.

See Also