Package net.sf.saxon.instruct
Class Attribute
java.lang.Object
net.sf.saxon.expr.ComputedExpression
net.sf.saxon.instruct.Instruction
net.sf.saxon.instruct.SimpleNodeConstructor
net.sf.saxon.instruct.Attribute
- All Implemented Interfaces:
Serializable
,SourceLocator
,Container
,Expression
,TailCallReturner
,InstructionInfoProvider
An instruction derived from an xsl:attribute element in stylesheet, or from
an attribute constructor in XQuery
- See Also:
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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
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Constructor Summary
ConstructorsConstructorDescriptionAttribute
(Expression attributeName, Expression namespace, NamespaceResolver nsContext, int validationAction, SimpleType schemaType, int annotation, boolean allowNameAsQName) Construct an Attribute instruction -
Method Summary
Modifier and TypeMethodDescriptionvoid
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.int
Get the static properties of this expression (other than its type).void
display
(int level, PrintStream out, Configuration config) Display this instruction as an expression, for diagnosticsint
evaluateNameCode
(XPathContext context) int
Determine the static cardinality of the expression.int
Get the name of this instructionGet the item type of the items returned by evaluating this instructionGet the subexpressions of this expressionvoid
localTypeCheck
(StaticContext env, ItemType contextItemType) processLeavingTail
(XPathContext context) Process this instructionprotected void
promoteInst
(PromotionOffer offer) Offer promotion for subexpressions.boolean
replaceSubExpression
(Expression original, Expression replacement) Replace one subexpression by a replacement subexpressionvoid
Indicate that two attributes with the same name are not acceptable.simplify
(StaticContext env) Simplify an expression.Methods inherited from class net.sf.saxon.instruct.SimpleNodeConstructor
checkContent, 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, 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
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Constructor Details
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Attribute
public Attribute(Expression attributeName, Expression namespace, NamespaceResolver nsContext, int validationAction, SimpleType schemaType, int annotation, boolean allowNameAsQName) Construct an Attribute instruction- Parameters:
attributeName
- An expression to calculate the attribute namenamespace
- An expression to calculate the attribute namespacensContext
- a NamespaceContext object containing the static namespace context of the stylesheet instructionvalidationAction
- e.g. validation=strict, lax, strip, preserveschemaType
- Type against which the attribute must be validated. This must not be a namespace-sensitive type; it is the caller's responsibility to check this.annotation
- Integer code identifying the type named in thetype
attributeallowNameAsQName
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Method Details
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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) -
getInstructionNameCode
public int getInstructionNameCode()Get the name of this instruction- Overrides:
getInstructionNameCode
in classInstruction
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getItemType
Description copied from class:Instruction
Get the item type of the items returned by evaluating this instruction- Specified by:
getItemType
in interfaceExpression
- Overrides:
getItemType
in classInstruction
- Parameters:
th
-- Returns:
- the static item type of the instruction
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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 interfaceExpression
- Overrides:
getCardinality
in classComputedExpression
- 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).
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computeSpecialProperties
public int computeSpecialProperties()Get the static properties of this expression (other than its type). The result is bit-signficant. These properties are used for optimizations. In general, if property bit is set, it is true, but if it is unset, the value is unknown.- Overrides:
computeSpecialProperties
in classSimpleNodeConstructor
- Returns:
- a set of flags indicating static properties of this expression
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simplify
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 interfaceExpression
- Overrides:
simplify
in classSimpleNodeConstructor
- Parameters:
env
- the static context- Returns:
- the simplified expression
- Throws:
XPathException
- if an error is discovered during expression rewriting
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localTypeCheck
- Specified by:
localTypeCheck
in classSimpleNodeConstructor
- Throws:
XPathException
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iterateSubExpressions
Get the subexpressions of this expression- Specified by:
iterateSubExpressions
in interfaceExpression
- Overrides:
iterateSubExpressions
in classSimpleNodeConstructor
- Returns:
- an iterator over the subexpressions
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replaceSubExpression
Replace one subexpression by a replacement subexpression- Specified by:
replaceSubExpression
in interfaceContainer
- Overrides:
replaceSubExpression
in classSimpleNodeConstructor
- Parameters:
original
- the original subexpressionreplacement
- the replacement subexpression- Returns:
- true if the original subexpression is found
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promoteInst
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 classSimpleNodeConstructor
- 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
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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 interfaceExpression
- Overrides:
checkPermittedContents
in classComputedExpression
- Parameters:
parentType
- The schema typeenv
- the static contextwhole
- true if this expression is expected to make the whole content of the type, false if it is expected to make up only a part- Throws:
XPathException
- if the expression doesn't match the required content type
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processLeavingTail
Process this instruction- Specified by:
processLeavingTail
in interfaceTailCallReturner
- Specified by:
processLeavingTail
in classInstruction
- Parameters:
context
- the dynamic context of the transformation- Returns:
- a TailCall to be executed by the caller, always null for this instruction
- Throws:
XPathException
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evaluateNameCode
- Overrides:
evaluateNameCode
in classSimpleNodeConstructor
- Throws:
XPathException
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display
Display this instruction as an expression, for diagnostics- Specified by:
display
in interfaceExpression
- Overrides:
display
in classSimpleNodeConstructor
- Parameters:
level
- indentation level for this expressionout
- Output destinationconfig
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