Package net.sf.saxon.instruct

Class Namespace

java.lang.Object

net.sf.saxon.expr.ComputedExpression

net.sf.saxon.instruct.Instruction

net.sf.saxon.instruct.SimpleNodeConstructor

net.sf.saxon.instruct.Namespace

All Implemented Interfaces:

java.io.Serializable, javax.xml.transform.SourceLocator, Container, Expression, TailCallReturner, InstructionInfoProvider

public class Namespace
extends SimpleNodeConstructor

An xsl:namespace element in the stylesheet. (XSLT 2.0)

See Also:

Serialized Form

Field Summary

Fields inherited from class net.sf.saxon.instruct.SimpleNodeConstructor

select

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

locationId, staticProperties

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

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

Constructor Summary

Constructors

Constructor	Description
Namespace(Expression name)

Method Summary

Modifier and Type	Method	Description
void	display(int level, java.io.PrintStream out, Configuration config)	Display this instruction as an expression, for diagnostics
int	evaluateNameCode(XPathContext context)
int	getCardinality()	Determine the static cardinality of the expression.
int	getInstructionNameCode()	Set the name of this instruction for diagnostic and tracing purposes
ItemType	getItemType(TypeHierarchy th)	Get the item type of the items returned by evaluating this instruction
java.util.Iterator	iterateSubExpressions()	Get the immediate sub-expressions of this expression.
void	localTypeCheck(StaticContext env, ItemType contextItemType)
TailCall	processLeavingTail(XPathContext context)	ProcessLeavingTail: called to do the real work of this instruction.
protected void	promoteInst(PromotionOffer offer)	Offer promotion for subexpressions.
boolean	replaceSubExpression(Expression original, Expression replacement)	Replace one subexpression by a replacement subexpression
Expression	simplify(StaticContext env)	Simplify an expression.

Methods inherited from class net.sf.saxon.instruct.SimpleNodeConstructor

checkContent, computeSpecialProperties, createsNewNodes, evaluateItem, expandChildren, getSelect, iterate, optimize, setSelect, typeCheck

Methods inherited from class net.sf.saxon.instruct.Instruction

appendItem, assembleParams, assembleTunnelParams, computeCardinality, dynamicError, evaluateAsString, getImplementationMethod, getInstructionInfo, getSourceLocator, isXSLT, process, promote

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

adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, getColumnNumber, getConstructType, getDependencies, getExecutable, getHostLanguage, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, markTailFunctionCalls, resetStaticProperties, setLocationId, setParentExpression, setParentExpression, suppressValidation, typeError

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.xml.transform.SourceLocator

getColumnNumber, getLineNumber, getPublicId, getSystemId

Constructor Detail

Namespace

public Namespace(Expression name)

Method Detail

getInstructionNameCode

public int getInstructionNameCode()

Set the name of this instruction for diagnostic and tracing purposes

Overrides:

getInstructionNameCode in class Instruction

simplify

public Expression simplify(StaticContext env)
                    throws XPathException

Description copied from class: Instruction

Simplify an expression. This performs any static optimization (by rewriting the expression as a different expression). The default implementation does nothing.

Specified by:

simplify in interface Expression

Overrides:

simplify in class SimpleNodeConstructor

Parameters:

env - the static context

Returns:

the simplified expression

Throws:

XPathException - if an error is discovered during expression rewriting

getItemType

public ItemType getItemType(TypeHierarchy th)

Description copied from class: Instruction

Get the item type of the items returned by evaluating this instruction

Specified by:

getItemType in interface Expression

Overrides:

getItemType in class Instruction

Returns:

the static item type of the instruction

getCardinality

public int getCardinality()

Description copied from class: ComputedExpression

Determine the static cardinality of the expression. This establishes how many items there will be in the result of the expression, at compile time (i.e., without actually evaluating the result.

Specified by:

getCardinality in interface Expression

Overrides:

getCardinality in class ComputedExpression

Returns:

one of the values Cardinality.ONE_OR_MORE, Cardinality.ZERO_OR_MORE, Cardinality.EXACTLY_ONE, Cardinality.ZERO_OR_ONE, Cardinality.EMPTY. This default implementation returns ZERO_OR_MORE (which effectively gives no information).

promoteInst

protected void promoteInst(PromotionOffer offer)
                    throws XPathException

Description copied from class: SimpleNodeConstructor

Offer promotion for subexpressions. The offer will be accepted if the subexpression is not dependent on the factors (e.g. the context item) identified in the PromotionOffer. By default the offer is not accepted - this is appropriate in the case of simple expressions such as constant values and variable references where promotion would give no performance advantage. This method is always called at compile time.

Overrides:

promoteInst in class SimpleNodeConstructor

Parameters:

offer - details of the offer, for example the offer to move expressions that don't depend on the context to an outer level in the containing expression

Throws:

XPathException - if any error is detected

localTypeCheck

public void localTypeCheck(StaticContext env,
                           ItemType contextItemType)

Specified by:

localTypeCheck in class SimpleNodeConstructor

iterateSubExpressions

public java.util.Iterator iterateSubExpressions()

Description copied from class: ComputedExpression

Get the immediate sub-expressions of this expression. Default implementation returns a zero-length array, appropriate for an expression that has no sub-expressions.

Specified by:

iterateSubExpressions in interface Expression

Overrides:

iterateSubExpressions in class SimpleNodeConstructor

Returns:

an iterator containing the sub-expressions of this expression

replaceSubExpression

public boolean replaceSubExpression(Expression original,
                                    Expression replacement)

Replace one subexpression by a replacement subexpression

Specified by:

replaceSubExpression in interface Container

Overrides:

replaceSubExpression in class SimpleNodeConstructor

Parameters:

original - the original subexpression

replacement - the replacement subexpression

Returns:

true if the original subexpression is found

evaluateNameCode

public int evaluateNameCode(XPathContext context)
                     throws XPathException

Overrides:

evaluateNameCode in class SimpleNodeConstructor

Throws:

XPathException

processLeavingTail

public TailCall processLeavingTail(XPathContext context)
                            throws XPathException

Description copied from class: Instruction

ProcessLeavingTail: called to do the real work of this instruction. This method must be implemented in each subclass. The results of the instruction are written to the current Receiver, which can be obtained via the Controller.

Specified by:

processLeavingTail in interface TailCallReturner

Specified by:

processLeavingTail in class Instruction

Parameters:

context - The dynamic context of the transformation, giving access to the current node, the current variables, etc.

Returns:

null if the instruction has completed execution; or a TailCall indicating a function call or template call that is delegated to the caller, to be made after the stack has been unwound so as to save stack space.

Throws:

XPathException

display

public void display(int level,
                    java.io.PrintStream out,
                    Configuration config)

Display this instruction as an expression, for diagnostics

Specified by:

display in interface Expression

Overrides:

display in class SimpleNodeConstructor

Parameters:

level - indentation level for this expression

out - Output destination