Package net.sf.saxon.functions

Class Error

java.lang.Object

net.sf.saxon.functions.AbstractFunction

net.sf.saxon.functions.SystemFunction

net.sf.saxon.functions.Error

All Implemented Interfaces:

Callable, FunctionItem, GroundedValue, Item, Sequence

public class Error
extends SystemFunction
implements Callable

Implement XPath function fn:error()

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Error.UserDefinedXPathException

Constructor Summary

Constructors

Constructor	Description
Error()

Method Summary

Modifier and Type	Method	Description
Sequence	call(XPathContext context, Sequence[] arguments)	Call the Callable.
Item	error(XPathContext context, QNameValue errorCode, StringValue desc, SequenceIterator errObject)
int	getSpecialProperties(Expression[] arguments)	Determine the special properties of this function.
boolean	isVacuousExpression()	Determine whether this is a vacuous expression as defined in the XQuery update specification

Methods inherited from class net.sf.saxon.functions.SystemFunction

dependsOnContextItem, dynamicCall, equals, export, exportAdditionalArguments, exportAttributes, fixArguments, getArity, getCardinality, getContextNode, getDescription, getDetails, getElaborator, getErrorCodeForTypeErrors, getFunctionItemType, getFunctionName, getIntegerBounds, getNetCost, getOperandRoles, getRequiredType, getResultItemType, getResultItemType, getRetainedStaticContext, getStaticBaseUriString, getStreamerName, getUniStringArg, hashCode, importAttributes, isSequenceVariadic, isTrustedResultType, makeCall, makeFunction, makeFunction40, makeFunctionCall, makeOptimizedFunctionCall, resultIfEmpty, setArity, setDetails, setRetainedStaticContext, supplyTypeInformation, toShortString, toString, typeCheckCaller

Methods inherited from class net.sf.saxon.functions.AbstractFunction

atomize, deepEqual40, deepEquals, effectiveBooleanValue, getAnnotations, getUnicodeStringValue, isArray, isMap, makeNewContext, simplify, typeCheck

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.om.FunctionItem

getGenre

Methods inherited from interface net.sf.saxon.om.GroundedValue

asIterable, concatenate, containsNode, materialize

Methods inherited from interface net.sf.saxon.om.Item

getLength, getStringValue, head, isStreamed, itemAt, iterate, reduce, subsequence

Methods inherited from interface net.sf.saxon.om.Sequence

makeRepeatable

Constructor Details

Error

public Error()

Method Details

getSpecialProperties

public int getSpecialProperties(Expression[] arguments)

Description copied from class: SystemFunction

Determine the special properties of this function. The general rule is that a system function call is non-creative unless more details are defined in a subclass.

Overrides:

getSpecialProperties in class SystemFunction

Parameters:

arguments - the actual arguments supplied in a call to the function

Returns:

the properties

isVacuousExpression

public boolean isVacuousExpression()

Determine whether this is a vacuous expression as defined in the XQuery update specification

Returns:

true if this expression is vacuous

error

public Item error(XPathContext context,
 QNameValue errorCode,
 StringValue desc,
 SequenceIterator errObject)
           throws XPathException

Throws:

XPathException

call

public Sequence call(XPathContext context,
 Sequence[] arguments)
              throws XPathException

Description copied from interface: Callable

Call the Callable.

Specified by:

call in interface Callable

Parameters:

context - the dynamic evaluation context

arguments - the values of the arguments, supplied as Sequences.

Generally it is advisable, if calling iterate() to process a supplied sequence, to call it only once; if the value is required more than once, it should first be converted to a GroundedValue by calling the utility method SequenceTool.toGroundedValue().

If the expected value is a single item, the item should be obtained by calling Sequence.head(): it cannot be assumed that the item will be passed as an instance of Item or AtomicValue.

It is the caller's responsibility to perform any type conversions required to convert arguments to the type expected by the callee. An exception is where this Callable is explicitly an argument-converting wrapper around the original Callable.

Returns:

the result of the evaluation, in the form of a Sequence. It is the responsibility of the callee to ensure that the type of result conforms to the expected result type.

Throws:

XPathException - if a dynamic error occurs during the evaluation of the expression