net.sf.saxon.functions
Class NamePart

java.lang.Object
  net.sf.saxon.expr.Expression
      net.sf.saxon.expr.FunctionCall
          net.sf.saxon.functions.SystemFunction
              net.sf.saxon.functions.NamePart

All Implemented Interfaces:

Serializable, SourceLocator, Container, EvaluableItem, SequenceIterable, InstructionInfoProvider

public class NamePart
extends SystemFunction

This class supports the name(), local-name(), and namespace-uri() functions from XPath 1.0, and also the XSLT generate-id() function

See Also:

Serialized Form

Field Summary

static int	DOCUMENT_URI
static int	GENERATE_ID
static int	LOCAL_NAME
static int	NAME
static int	NAMESPACE_URI
static int	NODE_NAME

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

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

Constructor Summary

NamePart()

Method Summary

int	computeSpecialProperties() Determine the special properties of this expression.
Item	evaluateItem(XPathContext c) Evaluate the function in a string context
static boolean	isGenerateIdFunction(Expression exp) Test whether an expression is a call on the generate-id() function
Expression	simplify(StaticContext env) Simplify and validate.

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

checkArguments, computeCardinality, display, getDetails, getErrorCodeForTypeErrors, getItemType, main, makeSystemFunction, optimize, setDetails

Methods inherited from class net.sf.saxon.expr.FunctionCall

getArguments, getDisplayName, getFunctionNameCode, getNumberOfArguments, iterateSubExpressions, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionNameCode, typeCheck

Methods inherited from class net.sf.saxon.expr.Expression

adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, effectiveBooleanValue, evaluateAsString, getCardinality, getColumnNumber, getContainingProcedure, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getInstructionInfo, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, iterate, markTailFunctionCalls, process, resetStaticProperties, setLocationId, setParentExpression, setParentExpression, suppressValidation

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NAME

public static final int NAME

See Also:

Constant Field Values

LOCAL_NAME

public static final int LOCAL_NAME

See Also:

Constant Field Values

NAMESPACE_URI

public static final int NAMESPACE_URI

See Also:

Constant Field Values

GENERATE_ID

public static final int GENERATE_ID

See Also:

Constant Field Values

DOCUMENT_URI

public static final int DOCUMENT_URI

See Also:

Constant Field Values

NODE_NAME

public static final int NODE_NAME

See Also:

Constant Field Values

Constructor Detail

NamePart

public NamePart()

Method Detail

simplify

public Expression simplify(StaticContext env)
                    throws XPathException

Simplify and validate.

Overrides:

simplify in class FunctionCall

Returns:

the simplified expression

Throws:

XPathException - if an error is discovered during expression rewriting

computeSpecialProperties

public int computeSpecialProperties()

Determine the special properties of this expression. The generate-id() function is a special case: it is considered creative if its operand is creative, so that generate-id(f()) is not taken out of a loop

Overrides:

computeSpecialProperties in class SystemFunction

evaluateItem

public Item evaluateItem(XPathContext c)
                  throws XPathException

Evaluate the function in a string context

Specified by:

evaluateItem in interface EvaluableItem

Overrides:

evaluateItem in class Expression

Parameters:

c - The context in which the expression is to be evaluated

Returns:

the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence

Throws:

XPathException - if any dynamic error occurs evaluating the expression

isGenerateIdFunction

public static boolean isGenerateIdFunction(Expression exp)

Test whether an expression is a call on the generate-id() function

Parameters:

exp - the expression to be tested

Returns:

true if exp is a call on generate-id(), else false