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java.lang.Object net.sf.saxon.expr.Expression net.sf.saxon.expr.instruct.Instruction net.sf.saxon.expr.instruct.SimpleNodeConstructor net.sf.saxon.expr.instruct.AttributeCreator net.sf.saxon.expr.instruct.ComputedAttribute
public final class ComputedAttribute
An instruction derived from an xsl:attribute element in stylesheet, or from an attribute constructor in XQuery, in cases where the attribute name is not known statically
Field Summary |
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Fields inherited from class net.sf.saxon.expr.instruct.SimpleNodeConstructor |
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select |
Fields inherited from class net.sf.saxon.expr.Expression |
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EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD |
Constructor Summary | |
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ComputedAttribute(Expression attributeName,
Expression namespace,
NamespaceResolver nsContext,
int validationAction,
SimpleType schemaType,
boolean allowNameAsQName)
Construct an Attribute instruction |
Method Summary | |
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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. |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
Expression |
copy()
Copy an expression. |
NodeName |
evaluateNodeName(XPathContext context)
Determine the name to be used for the attribute, as an integer name code |
void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure. |
int |
getCardinality()
Get the static cardinality of this expression |
int |
getInstructionNameCode()
Get the name of this instruction |
ItemType |
getItemType(TypeHierarchy th)
Get the static type of this expression |
Expression |
getNameExpression()
Get the expression used to compute the name of the attribute |
Expression |
getNamespaceExpression()
Get the expression used to compute the namespace part of the name of the attribute |
NamespaceResolver |
getNamespaceResolver()
Get the namespace resolver used to resolve any prefix in the name of the attribute |
boolean |
isAllowNameAsQName()
Allows |
Iterator<Expression> |
iterateSubExpressions()
Get the subexpressions of this expression |
void |
localTypeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Method to perform type-checking specific to the kind of instruction |
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
protected void |
promoteInst(PromotionOffer offer)
Offer promotion for subexpressions. |
boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression |
void |
setRejectDuplicates()
Indicate that two attributes with the same name are not acceptable. |
Expression |
simplify(ExpressionVisitor visitor)
Simplify an expression. |
Methods inherited from class net.sf.saxon.expr.instruct.AttributeCreator |
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getOptions, getSchemaType, getValidationAction, processValue, setNoSpecialChars, setOptions, setSchemaType, setValidationAction |
Methods inherited from class net.sf.saxon.expr.instruct.SimpleNodeConstructor |
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checkContent, computeCardinality, createsNewNodes, evaluateItem, getContentExpression, iterate, processLeavingTail, setSelect, typeCheck |
Methods inherited from class net.sf.saxon.expr.instruct.Instruction |
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assembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getConstructType, getExpressionName, getImplementationMethod, getInstructionName, getIteratorFromProcessMethod, getSourceLocator, isXSLT, process, promote |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface javax.xml.transform.SourceLocator |
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getColumnNumber, getLineNumber, getPublicId, getSystemId |
Constructor Detail |
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public ComputedAttribute(Expression attributeName, Expression namespace, NamespaceResolver nsContext, int validationAction, SimpleType schemaType, boolean allowNameAsQName)
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.allowNameAsQName
- true if the attributeName expression is allowed to evaluate to a value
of type xs:QName (true in XQuery, false in XSLT)Method Detail |
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public void setRejectDuplicates()
setRejectDuplicates
in class AttributeCreator
public int getInstructionNameCode()
getInstructionNameCode
in class Instruction
public Expression getNameExpression()
public Expression getNamespaceExpression()
public NamespaceResolver getNamespaceResolver()
public ItemType getItemType(TypeHierarchy th)
getItemType
in class Instruction
th
- the type hierarchy cache
public int getCardinality()
getCardinality
in class Expression
public boolean isAllowNameAsQName()
public int computeSpecialProperties()
computeSpecialProperties
in class AttributeCreator
public Expression simplify(ExpressionVisitor visitor) throws XPathException
Instruction
simplify
in class SimpleNodeConstructor
visitor
- an expression visitor
XPathException
- if an error is discovered during expression
rewritingpublic void localTypeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
SimpleNodeConstructor
localTypeCheck
in class SimpleNodeConstructor
visitor
- an expression visitorcontextItemType
- the static type of the context item
XPathException
- if a type error is detectedpublic Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
Expression
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize
in class SimpleNodeConstructor
visitor
- an expression visitorcontextItemType
- the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
XPathException
- if an error is discovered during this phase
(typically a type error)public Expression copy()
copy
in class Expression
public Iterator<Expression> iterateSubExpressions()
iterateSubExpressions
in class SimpleNodeConstructor
public boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression
in class SimpleNodeConstructor
original
- the original subexpressionreplacement
- the replacement subexpression
protected void promoteInst(PromotionOffer offer) throws XPathException
promoteInst
in class SimpleNodeConstructor
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
XPathException
- if any error is detectedpublic void checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) throws XPathException
checkPermittedContents
in class Expression
parentType
- the "given complex type": the method is checking that the nodes returned by this
expression are acceptable members of the content model of this typeenv
- the static contextwhole
- if true, we want to check that the value of this expression satisfies the content model
as a whole; if false we want to check that the value of the expression is acceptable as one part
of the content
XPathException
- if the value delivered by this expression cannot be part of the content model
of the given typepublic NodeName evaluateNodeName(XPathContext context) throws XPathException
evaluateNodeName
in class SimpleNodeConstructor
context
- Dynamic evaluation context
XPathException
public void explain(ExpressionPresenter out)
explain
in class Expression
out
- the expression presenter used to display the structure
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