net.sf.saxon.instruct
Class FixedAttribute

java.lang.Object
  net.sf.saxon.expr.ComputedExpression
      net.sf.saxon.instruct.Instruction
          net.sf.saxon.instruct.SimpleNodeConstructor
              net.sf.saxon.instruct.FixedAttribute

All Implemented Interfaces:

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

public final class FixedAttribute

extends SimpleNodeConstructor

An instruction derived from an xsl:attribute element in stylesheet, or from an attribute constructor in XQuery. This version deals only with attributes whose name is known at compile time. It is also used for attributes of literal result elements. The value of the attribute is in general computed at run-time.

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

FixedAttribute(int nameCode, int validationAction, SimpleType schemaType, int annotation)
Construct an Attribute instruction

Method Summary

void	checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type.
void	display(int level, NamePool pool, java.io.PrintStream out) Display this instruction as an expression, for diagnostics
Item	evaluateItem(XPathContext context) Evaluate as an expression.
protected int	evaluateNameCode(XPathContext context)
int	getCardinality() Determine the static cardinality of the expression.
InstructionInfo	getInstructionInfo() Get InstructionInfo for this expression
int	getInstructionNameCode() Get the name of this instruction (return 'xsl:attribute')
ItemType	getItemType(TypeHierarchy th) Get the item type of the items returned by evaluating this instruction
void	localTypeCheck(StaticContext env, ItemType contextItemType)
TailCall	processLeavingTail(XPathContext context) Process this instruction
void	setNoSpecialChars() Indicate that the attribute value contains no special characters that might need escaping
void	setRejectDuplicates() Indicate that two attributes with the same name are not acceptable.
void	setSelect(Expression select, Configuration config) Set the expression defining the value of the attribute.

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

checkContent, computeSpecialProperties, createsNewNodes, expandChildren, getSelect, iterate, iterateSubExpressions, optimize, promoteInst, simplify, typeCheck

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

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

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

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

FixedAttribute

public FixedAttribute(int nameCode,
                      int validationAction,
                      SimpleType schemaType,
                      int annotation)

Construct an Attribute instruction

Parameters:

nameCode - Represents the attribute name

annotation - Integer code identifying the type named in the type attribute of the instruction - zero if the attribute was not present

Method Detail

getInstructionNameCode

public int getInstructionNameCode()

Get the name of this instruction (return 'xsl:attribute')

Overrides:

getInstructionNameCode in class Instruction

setRejectDuplicates

public void setRejectDuplicates()

Indicate that two attributes with the same name are not acceptable. (This option is set in XQuery, but not in XSLT)

setNoSpecialChars

public void setNoSpecialChars()

Indicate that the attribute value contains no special characters that might need escaping

setSelect

public void setSelect(Expression select,
                      Configuration config)
               throws StaticError

Set the expression defining the value of the attribute. If this is a constant, and if validation against a schema type was requested, the validation is done immediately.

Overrides:

setSelect in class SimpleNodeConstructor

Parameters:

select - The expression defining the content of the attribute

config -

Throws:

StaticError - if the expression is a constant, and validation is requested, and the constant doesn't match the required type.

getInstructionInfo

public InstructionInfo getInstructionInfo()

Description copied from class: ComputedExpression

Get InstructionInfo for this expression

Specified by:

getInstructionInfo in interface InstructionInfoProvider

Overrides:

getInstructionInfo in class Instruction

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

Parameters:

th -

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).

localTypeCheck

public void localTypeCheck(StaticContext env,
                           ItemType contextItemType)

Specified by:

localTypeCheck in class SimpleNodeConstructor

evaluateNameCode

protected int evaluateNameCode(XPathContext context)

Overrides:

evaluateNameCode in class SimpleNodeConstructor

checkPermittedContents

public void checkPermittedContents(SchemaType parentType,
                                   StaticContext env,
                                   boolean whole)
                            throws XPathException

Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type. It's always OK to say yes, since the check will be repeated at run-time. The process of checking element and attribute constructors against the content model of a complex type also registers the type of content expected of those constructors, so the static validation can continue recursively.

Specified by:

checkPermittedContents in interface Expression

Overrides:

checkPermittedContents in class ComputedExpression

Throws:

XPathException

processLeavingTail

public TailCall processLeavingTail(XPathContext context)
                            throws XPathException

Process this instruction

Specified by:

processLeavingTail in interface TailCallReturner

Specified by:

processLeavingTail in class Instruction

Parameters:

context - the dynamic context of the transformation

Returns:

a TailCall to be executed by the caller, always null for this instruction

Throws:

XPathException

evaluateItem

public Item evaluateItem(XPathContext context)
                  throws XPathException

Description copied from class: SimpleNodeConstructor

Evaluate as an expression. We rely on the fact that when these instructions are generated by XQuery, there will always be a valueExpression to evaluate the content

Specified by:

evaluateItem in interface Expression

Overrides:

evaluateItem in class SimpleNodeConstructor

Throws:

XPathException

display

public void display(int level,
                    NamePool pool,
                    java.io.PrintStream out)

Display this instruction as an expression, for diagnostics

Specified by:

display in interface Expression

Overrides:

display in class SimpleNodeConstructor