Package net.sf.saxon.instruct
Class FixedAttribute
- java.lang.Object
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- net.sf.saxon.expr.ComputedExpression
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- net.sf.saxon.instruct.Instruction
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- net.sf.saxon.instruct.SimpleNodeConstructor
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- net.sf.saxon.instruct.FixedAttribute
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- All Implemented Interfaces:
java.io.Serializable
,javax.xml.transform.SourceLocator
,Container
,Expression
,TailCallReturner
,InstructionInfoProvider
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
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Field Summary
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Fields inherited from class net.sf.saxon.instruct.SimpleNodeConstructor
select
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Fields inherited from class net.sf.saxon.expr.ComputedExpression
locationId, staticProperties
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Fields inherited from interface net.sf.saxon.expr.Expression
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD
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Constructor Summary
Constructors Constructor Description FixedAttribute(int nameCode, int validationAction, SimpleType schemaType, int annotation)
Construct an Attribute instruction
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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, java.io.PrintStream out, Configuration config)
Display this instruction as an expression, for diagnosticsItem
evaluateItem(XPathContext context)
Evaluate as an expression.int
evaluateNameCode(XPathContext context)
int
getCardinality()
Determine the static cardinality of the expression.InstructionInfo
getInstructionInfo()
Get InstructionInfo for this expressionint
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 instructionint
getValidationAction()
void
localTypeCheck(StaticContext env, ItemType contextItemType)
TailCall
processLeavingTail(XPathContext context)
Process this instructionvoid
setNoSpecialChars()
Indicate that the attribute value contains no special characters that might need escapingvoid
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, replaceSubExpression, simplify, typeCheck
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Methods inherited from class net.sf.saxon.instruct.Instruction
appendItem, assembleParams, assembleTunnelParams, computeCardinality, dynamicError, evaluateAsString, getImplementationMethod, getSourceLocator, isXSLT, process, promote
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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
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Constructor Detail
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FixedAttribute
public FixedAttribute(int nameCode, int validationAction, SimpleType schemaType, int annotation)
Construct an Attribute instruction- Parameters:
nameCode
- Represents the attribute nameannotation
- Integer code identifying the type named in thetype
attribute of the instruction - zero if the attribute was not present
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Method Detail
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getInstructionNameCode
public int getInstructionNameCode()
Get the name of this instruction (return 'xsl:attribute')- Overrides:
getInstructionNameCode
in classInstruction
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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)
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setNoSpecialChars
public void setNoSpecialChars()
Indicate that the attribute value contains no special characters that might need escaping
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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 classSimpleNodeConstructor
- Parameters:
select
- The expression defining the content of the attributeconfig
-- Throws:
StaticError
- if the expression is a constant, and validation is requested, and the constant doesn't match the required type.
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getInstructionInfo
public InstructionInfo getInstructionInfo()
Description copied from class:ComputedExpression
Get InstructionInfo for this expression- Specified by:
getInstructionInfo
in interfaceInstructionInfoProvider
- Overrides:
getInstructionInfo
in classInstruction
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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 interfaceExpression
- Overrides:
getItemType
in classInstruction
- 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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getValidationAction
public int getValidationAction()
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localTypeCheck
public void localTypeCheck(StaticContext env, ItemType contextItemType)
- Specified by:
localTypeCheck
in classSimpleNodeConstructor
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evaluateNameCode
public int evaluateNameCode(XPathContext context)
- Overrides:
evaluateNameCode
in classSimpleNodeConstructor
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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
public TailCall processLeavingTail(XPathContext context) throws XPathException
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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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 interfaceExpression
- Overrides:
evaluateItem
in classSimpleNodeConstructor
- Parameters:
context
- 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
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display
public void display(int level, java.io.PrintStream out, Configuration config)
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 destination
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