Package com.saxonica.functions.hof

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

See: Description

Class Summary

Class	Description
AbstractFunctionItem	Abstract superclass (and factory class) for implementations of FunctionItem
AtomicConstructorFunctionItem	A function item representing a constructor function for an atomic type
CallableFunctionItem	A function item that wraps a Callable
CallableWithBoundFocus	A Callable that wraps another Callable and a Dynamic Context, in effect acting as a closure that executes the original callable with a saved context.
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
FilterFn	This class implements the function fn:filter(), which is a standard function in XQuery 3.0
FoldLeftFn	This class implements the function fn:fold-left(), which is a standard function in XPath 3.0
FoldRightFn	This class implements the function fn:fold-right(), which is a standard function in XQuery 1.1
ForEachFn	This class implements the function fn:for-each() (formerly fn:map), which is a standard function in XQuery 3.0
ForEachPairFn	This class implements the function fn:for-each-pair() (formerly fn:map-pairs()), which is a standard function in XQuery 3.0
FunctionArity	This class implements the function function-arity(), which is a standard function in XPath 3.0
FunctionLiteral	A FunctionLiteral 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.
FunctionName	This class implements the function function-name(), which is a standard function in XPath 3.0
FunctionSequenceCoercer	An FunctionSequenceCoercer performs function coercion on a sequence of function items
FunctionSequenceCoercer.Coercer
PartialApply	This expression class implements the operation of currying (or performing partial application) of a function.
SpecificFunctionType	An instance of this class represents a specific function item type, for example function(xs:int) as xs:boolean
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