net.sf.saxon.expr
Class UserFunctionCall.FunctionCallPackage

java.lang.Object
  net.sf.saxon.value.Value
      net.sf.saxon.value.AtomicValue
          net.sf.saxon.value.ObjectValue
              net.sf.saxon.expr.UserFunctionCall.FunctionCallPackage

All Implemented Interfaces:

Expression, Item, java.io.Serializable, ValueRepresentation

Enclosing class:

UserFunctionCall

public class UserFunctionCall.FunctionCallPackage

extends ObjectValue

Inner class used to wrap up the set of actual arguments to a tail-recursive call of the containing function. This argument package is passed back to the calling code in place of a function result; the caller then loops to re-invoke the function with these arguments, avoiding the creation of an additional stack frame.

See Also:

Serialized Form

Field Summary

Fields inherited from class net.sf.saxon.value.Value

EMPTY_CLASS_ARRAY

Fields inherited from interface net.sf.saxon.om.ValueRepresentation

EMPTY_VALUE_ARRAY

Fields inherited from interface net.sf.saxon.expr.Expression

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

Constructor Summary

UserFunctionCall.FunctionCallPackage(UserFunction function, ValueRepresentation[] actualArgs, XPathContext c)

Method Summary

ValueRepresentation	call()
ItemType	getItemType(TypeHierarchy th) Determine the item type of the expression
AtomicValue	getPrimitiveValue() Get the primitive value (the value in the value space).
SequenceIterator	iterateResults(XPathContext context)
Value	reduce() Reduce a value to its simplest form.

Methods inherited from class net.sf.saxon.value.ObjectValue

convertPrimitive, convertToJava, effectiveBooleanValue, equals, getObject, getStringValue, hashCode, setValue

Methods inherited from class net.sf.saxon.value.AtomicValue

checkPermittedContents, convert, convert, display, evaluateAsString, evaluateItem, getCardinality, getComponent, getImplementationMethod, getLength, getStringValueCS, getTypedValue, hasBuiltInType, iterate, process, schemaEquals, toString

Methods inherited from class net.sf.saxon.value.Value

asItem, asIterator, asValue, collapseWhitespace, convert, convertJavaObjectToXPath, getDependencies, getIterator, getParentExpression, getSpecialProperties, itemAt, iterateSubExpressions, makeQNameValue, normalizeWhitespace, optimize, promote, simplify, stringToNumber, trimWhitespace, typeCheck

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

UserFunctionCall.FunctionCallPackage

public UserFunctionCall.FunctionCallPackage(UserFunction function,
                                            ValueRepresentation[] actualArgs,
                                            XPathContext c)

Method Detail

getItemType

public ItemType getItemType(TypeHierarchy th)

Determine the item type of the expression

Specified by:

getItemType in interface Expression

Overrides:

getItemType in class ObjectValue

Parameters:

th -

Returns:

Type.OBJECT

call

public ValueRepresentation call()
                         throws XPathException

Throws:

XPathException

iterateResults

public SequenceIterator iterateResults(XPathContext context)
                                throws XPathException

Throws:

XPathException

reduce

public Value reduce()
             throws XPathException

Reduce a value to its simplest form. If the value is a closure or some other form of deferred value such as a FunctionCallPackage, then it is reduced to a SequenceExtent. If it is a SequenceExtent containing a single item, then it is reduced to that item. One consequence that is exploited by class FilterExpression is that if the value is a singleton numeric value, then the result will be an instance of NumericValue

Overrides:

reduce in class Value

Throws:

XPathException

getPrimitiveValue

public AtomicValue getPrimitiveValue()

Get the primitive value (the value in the value space). This returns an AtomicValue of a class that would be used to represent the primitive value. In effect this means that for built-in types, it returns the value itself, but for user-defined type, it returns the primitive value minus the type annotation. Note that getItemType() when applied to the result of this function does not not necessarily return a primitive type: for example, this function may return a value of type xdt:dayTimeDuration, which is not a primitive type as defined by Type.isPrimitiveType(int)

Overrides:

getPrimitiveValue in class AtomicValue