public final class ComputedAttribute extends AttributeCreator
selectOp
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD
Constructor and Description |
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ComputedAttribute(Expression attributeName,
Expression namespace,
NamespaceResolver nsContext,
int validationAction,
SimpleType schemaType,
boolean allowNameAsQName)
Construct an Attribute instruction
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Modifier and Type | Method and Description |
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void |
checkPermittedContents(SchemaType parentType,
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(RebindingMap rebindings)
Copy an expression.
|
Item |
evaluateItem(XPathContext context)
Evaluate as an expression.
|
NodeName |
evaluateNodeName(XPathContext context)
Determine the name to be used for the attribute, as an integer name code
|
void |
export(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()
Get the static type of this expression
|
Expression |
getNameExp()
Get the expression used to compute the name of the attribute
|
Expression |
getNamespaceExp()
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()
Ask whether it is allowed for the name to be evaluted as an xs:QName instance (true in XQuery)
|
void |
localTypeCheck(ExpressionVisitor visitor,
ContextItemStaticInfo contextItemType)
Method to perform type-checking specific to the kind of instruction
|
java.lang.Iterable<Operand> |
operands()
Get the immediate sub-expressions of this expression, with information about the relationship
of each expression to its parent expression.
|
Expression |
optimize(ExpressionVisitor visitor,
ContextItemStaticInfo contextItemType)
Perform optimisation of an expression and its subexpressions.
|
void |
setNameExp(Expression attributeName) |
void |
setNamespace(Expression namespace) |
void |
setRejectDuplicates()
Indicate that two attributes with the same name are not acceptable.
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getOptions, getSchemaType, getValidationAction, isInstruction, processValue, setInstruction, setNoSpecialChars, setOptions, setSchemaType, setValidationAction, validateOrphanAttribute
allowExtractingCommonSubexpressions, alwaysCreatesNewNodes, checkContent, computeCardinality, getSelect, getStreamerName, isLocal, iterate, mayCreateNewNodes, processLeavingTail, setSelect, typeCheck
assembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getConstructType, getExpressionName, getImplementationMethod, getInstructionName, getNetCost, getSourceLocator, isXSLT, process, someOperandCreatesNewNodes
addToPathMap, adoptChildExpression, checkedOperands, checkForUpdatingSubexpressions, computeDependencies, computeHashCode, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluatePendingUpdates, explain, getConfiguration, getCost, getDependencies, getEvaluationMethod, getExtraProperty, getIntegerBounds, getInterpretedExpression, getIntrinsicDependencies, getLocalRetainedStaticContext, getLocation, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getScopingExpression, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, getStaticUType, hasCompatibleStaticContext, hashCode, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isCallOnSystemFunction, isIdentical, isLiftable, isMultiThreaded, isSameExpression, isStaticPropertiesKnown, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setFlattened, setLocation, setParentExpression, setRetainedStaticContext, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplify, simplifyChildren, staticTypeCheck, suppressValidation, toPattern, toShortString, toString, typeCheckChildren, typeError, unordered, verifyParentPointers, verifyParentPointers
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)public void setRejectDuplicates()
setRejectDuplicates
in class AttributeCreator
public int getInstructionNameCode()
getInstructionNameCode
in class Instruction
public Expression getNameExp()
public Expression getNamespaceExp()
public void setNameExp(Expression attributeName)
public void setNamespace(Expression namespace)
public java.lang.Iterable<Operand> operands()
Expression
If the expression is a Callable, then it is required that the order of the operands returned by this function is the same as the order of arguments supplied to the corresponding call() method.
operands
in class SimpleNodeConstructor
public NamespaceResolver getNamespaceResolver()
public ItemType getItemType()
getItemType
in class AttributeCreator
public int getCardinality()
getCardinality
in class Expression
public boolean isAllowNameAsQName()
public int computeSpecialProperties()
computeSpecialProperties
in class AttributeCreator
public void localTypeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextItemType) throws XPathException
SimpleNodeConstructor
localTypeCheck
in class SimpleNodeConstructor
visitor
- an expression visitorcontextItemType
- the static type of the context itemXPathException
- if a type error is detectedpublic Expression optimize(ExpressionVisitor visitor, ContextItemStaticInfo 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(RebindingMap rebindings)
copy
in class Expression
rebindings
- public void checkPermittedContents(SchemaType parentType, 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 typewhole
- 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 contentXPathException
- 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 contextXPathException
public Item evaluateItem(XPathContext context) throws XPathException
SimpleNodeConstructor
evaluateItem
in class SimpleNodeConstructor
context
- The context in which the expression is to be evaluatedXPathException
- if any dynamic error occurs evaluating the
expressionpublic void export(ExpressionPresenter out) throws XPathException
export
in interface ExportAgent
export
in class Expression
out
- the expression presenter used to display the structureXPathException
- if the export fails, for example if an expression is found that won't work
in the target environment.Copyright (c) 2004-2018 Saxonica Limited. All rights reserved.