SubsetNew (Arraylist function)

Return all matching Arraylist items (Arraylist class)

SubsetNew searches the entire Arraylist to find and return all items that match a specified criterion. The criterion is supplied by the SelectionCriterion object that is the required SubsetNew parameter. If no item satisfies the criterion, SubsetNew returns an empty Arraylist.

Syntax

%newList = al:SubsetNew( selectionCriterion)

Syntax terms

%newList	An Arraylist variable of the same type as the method Arraylist (al) to receive the items that are located by the search. If %newList is not empty, its contents are discarded before it is populated by any items returned from SubsetNew.
al	An Arraylist object.
selectionCriterion	A SelectionCriterion object, which is a relational expression that is applied to an al 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, -11) is the criterion this > -11, where this is an identity function that simply returns the item's value. The items that satisfy this expression populate the Arraylist that SubsetNew returns. 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 al declaration and that returns a numeric or string value. This is described further in "Specifying a SelectionCriterion's parameters".

Usage notes

• FindNextItem without the Start argument is similar to SubsetNew except that it returns just the first matching item it encounters.
• SubsetNew is available in "Sirius Mods" Version 7.6 and later.

Examples

1. The following request contains two SubsetNew calls, one with a simple selection criterion and one with a compound criterion:

   begin %al is arraylist of float %alnew is arraylist of float %al = list(111, 29, 0, 93, 77, -345) %sel1 is object selectioncriterion for float %sel2 is object selectioncriterion for float %sel1 = GT(this, 0) %sel2 = AND(GE(this, 50), LT(this, 93)) %alnew = %al:SubsetNew(%sel1) Print 'The result of selection1 is:' %alnew:print %alnew = %al:SubsetNew(%sel2) print 'The result of selection2 is:' %alnew:print end

   The result is:

   The result of selection1 is: 1: 111 2: 29 3: 93 4. 77 The result of selection2 is: 1: 93 2: 77

See also

Arraylist class FloatNamedArraylist class NamedArraylist class UnicodeNamedArraylist class	List of Arraylist methods List of FloatNamedArraylist methods List of NamedArraylist methods List of UnicodeNamedArraylist methods List of Collection methods	Arraylist methods syntax FloatNamedArraylist methods syntax NamedArraylist methods syntax UnicodeNamedArraylist methods syntax
Notation conventions for methods