FindNextItem (FloatNamedArraylist function)

<section begin=dpl_desc/>Find matching FloatNamedArrayl<section end=dpl_desc/>

FindNextItem is a member of the FloatNamedArraylist class.

This function searches “forward” in the FloatNamedArraylist to find and return the next item that matches a specified criterion. The criterion is supplied by the SelectionCriterion object that is a required FindNextItem parameter. If no item satisfies the criterion, the request is cancelled and an ItemNotFound exception (?? refid=itemnfe.) is thrown.

FindNextItem is available in Sirius Mods version 7.6 and later.

Syntax

  %item = %fnamrayl:FindNextItem(criterion        -
                                 [, Start=itemnum])

Syntax Terms

%item

A variable of the type of the items in the FloatNamedArraylist to contain the item that is located by the search.

%fnamrayl

A FloatNamedArraylist object.

criterion

A SelectionCriterion object, which is a relational expression that is applied to a %fnamrayl item value to determine whether the value satisfies the expression. The expression consists of a function, an operator, and a numeric or string value. For example, GT(this, -1) is the criterion this > -1, where this is an identity function that simply returns the item's value. The first item tested by FindNextItem that satisfies this expression is the method's return value. The function in the criterion is a method value (a method or class member name literal, or a method variable) for a method that operates on items of the type specified on the %fnamrayl declaration and that returns a numeric or string value. This is described further in "Specifying a SelectionCriterion's parameters".

Start= itemnum

The number of the item after which to begin the search. If the itemnum value of Start is 2, item 3 is the first item considered. The value of Start may be 0 through the number of items in the FloatNamedArraylist. For a FloatNamedArraylist of three items, itemnum may be 0, 1, 2, or 3. This is an optional argument, and it defaults to 0. If you specify a value, the parameter name Start is required.

Usage Notes

• If the value of Start is greater than the number of items in the FloatNamedArraylist, the request is cancelled. If the value of Start is equal to the number of items, the request is cancelled, but an ItemNotFound exception is thrown.
• FindPreviousItem is identical to FindNextItem except that it searches backward in the FloatNamedArraylist.

Examples

In the following fragment, two FindNextItem calls are applied to a FloatNamedArraylist of objects of the annual class that is defined in the request in the "FloatNamedArraylist Minimum function example". The second call finds no matching item:

    %fann is floatnamedArraylist of object annual
    %fann = new
    %fann(12) = newa(621, 650)
    %fann(14) = newa(334, 343)
    %fann(15) = newa(288, 276)
    %fann(13) = newa(141, 182)
    %fann(11) = newa(131, 115)

    %sel is object selectionCriterion for object annual
    %sel2 is object selectionCriterion for object annual
    %sel = AND(GT(chg, 10), LE(yend, 200))
    %sel2 = AND(GT(chg, 10), LE(yend, 100))

    %ann is object annual
    %ann = %fann:findNextItem(%sel)
    print %ann:myprint

    %ann = %fann:findNextItem(%sel2)
    print %ann:myprint

The result is:

    ybegin=141, yend=182
     Class FLOATNAMEDARRAYLIST, function FINDNEXTITEM:
     ITEMNOTFOUND exception: no items match Selection-
     Criterion in line 54