Package com.saxonica.functions.hof

The package com.saxonica.hof contains code to support higher-order functions.

See:
Description

Class Summary

AbstractFunctionItem	Abstract superclass (and factory class) for implementations of FunctionItem
CoercedFunction	A function item obtained by coercing a supplied function; this adds a wrapper to perform dynamic type checking of the arguments in any call, and type checking of the result.
CurriedFunction	A function obtained by currying another function, that is, the result of calling fn:partial-apply
DynamicFunctionCallDefinition	This class implements the extension function saxon:call(), which calls a FunctionItem The first argument is the FunctionItem object, the remaining arguments are the parameters to be supplied in the call.
DynamicFunctionCallDefinition.DynamicFunctionCall
DynamicFunctionConstructor	This class implements the extension function saxon:function(), which returns a FirstClassFunction object representing the function named in the first argument.
FilterFn	This class implements the function fn:filter(), which is a standard function in XQuery 1.1
FirstClassFunction	A FirstClassFunction is a value that encapsulates a function; it can therefore be manipulated like any other value: for example it can be assigned to a variable and passed as a parameter to a function.
FoldLeftFn	This class implements the function fn:fold-left(), which is a standard function in XQuery 1.1
FoldRightFn	This class implements the function fn:fold-right(), which is a standard function in XQuery 1.1
FunctionItemExpression	A FunctionItemExpression is a wrapper around a FunctionItem; it is an expression, whose value is the function item that it wraps.
FunctionLookup	This class supports the function-lookup() function in XPath 3.0.
FunctionSequenceCoercer	An FunctionSequenceCoercer performs function coercion on a sequence of function items
FunctionType	An instance of this class represents a specific function item type, for example function(xs:int) as xs:boolean
MapFn	This class implements the function fn:map(), which is a standard function in XQuery 1.1
MapPairsFn	This class implements the function fn:map-pairs(), which is a standard function in XQuery 1.1
PartialApply	This expression class implements the operation of currying (or performing partial application) of a function.
UserFunctionItem	A UserFunctionItem is a function item representing a call on a user-defined function.

Package com.saxonica.functions.hof Description

The package com.saxonica.hof contains code to support higher-order functions.

Higher-order functions are supported in XQuery 1.1 using native language syntax, and they are also available in other environments (including XSLT) using the Saxon extension functions saxon:function() and saxon:call().

Michael H. Kay
Saxonica Limited
12 June 2009