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java.lang.Object net.sf.saxon.expr.Expression net.sf.saxon.expr.instruct.Instruction net.sf.saxon.expr.instruct.ParentNodeConstructor net.sf.saxon.expr.instruct.ElementCreator net.sf.saxon.expr.instruct.ComputedElement
public class ComputedElement
An instruction representing an xsl:element element in an XSLT stylesheet, or a computed element constructor in XQuery. (In both cases, if the element name is expressed as a compile-time expression, then a FixedElement instruction is used instead.)
FixedElement
,
Serialized FormField Summary |
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Fields inherited from class net.sf.saxon.expr.instruct.ElementCreator |
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inheritNamespaces |
Fields inherited from class net.sf.saxon.expr.instruct.ParentNodeConstructor |
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content, preservingTypes |
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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ComputedElement(Expression elementName,
Expression namespace,
NamespaceResolver nsContext,
SchemaType schemaType,
int validation,
boolean inheritNamespaces,
boolean allowQName)
Create an instruction that creates a new element node |
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. |
Expression |
copy()
Copy an expression. |
void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure. |
NodeName |
getElementName(XPathContext context,
NodeInfo copiedNode)
Callback from the superclass ElementCreator to get the nameCode for the element name |
int |
getInstructionNameCode()
Get the name of this instruction for diagnostic and tracing purposes |
ItemType |
getItemType(TypeHierarchy th)
Get the item type of the value returned by this instruction |
Expression |
getNameExpression()
Get the expression used to compute the element name |
Expression |
getNamespaceExpression()
Get the expression used to compute the namespace URI |
NamespaceResolver |
getNamespaceResolver()
Get the namespace resolver that provides the namespace bindings defined in the static context |
String |
getNewBaseURI(XPathContext context,
NodeInfo copiedNode)
Get the base URI for the element being constructed |
boolean |
isAllowNameAsQName()
Ask whether the name can be supplied as a QName. |
Iterator<Expression> |
iterateSubExpressions()
Get the immediate sub-expressions of this expression. |
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
protected void |
outputNamespaceNodes(XPathContext context,
Receiver out,
NodeName nameCode,
NodeInfo copiedNode)
Callback to output namespace nodes for the new element. |
protected void |
promoteInst(PromotionOffer offer)
Offer promotion for subexpressions. |
boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression |
Expression |
simplify(ExpressionVisitor visitor)
Simplify an expression. |
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform type checking of an expression and its subexpressions. |
Methods inherited from class net.sf.saxon.expr.instruct.ElementCreator |
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checkContentSequence, computeSpecialProperties, evaluateItem, getActiveNamespaces, getImplementationMethod, isInheritNamespaces, iterateEvents, iterateEvents, processLeavingTail, processLeavingTail, processLeft, processLeft, processRight, suppressValidation |
Methods inherited from class net.sf.saxon.expr.instruct.ParentNodeConstructor |
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addToPathMap, computeCardinality, createsNewNodes, getBaseURI, getCardinality, getContentExpression, getSchemaType, getValidationAction, isLazyConstruction, isNamespaceSensitive, isPreservingTypes, setBaseURI, setContentExpression, setLazyConstruction, setNoNeedToStrip, setSchemaType, setValidationAction |
Methods inherited from class net.sf.saxon.expr.instruct.Instruction |
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assembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getConstructType, getExpressionName, getInstructionName, getIteratorFromProcessMethod, getSourceLocator, isXSLT, iterate, 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 ComputedElement(Expression elementName, Expression namespace, NamespaceResolver nsContext, SchemaType schemaType, int validation, boolean inheritNamespaces, boolean allowQName)
elementName
- Expression that evaluates to produce the name of the
element node as a lexical QNamenamespace
- Expression that evaluates to produce the namespace URI of
the element node. Set to null if the namespace is to be deduced from the prefix
of the elementName.nsContext
- Saved copy of the static namespace context for the instruction.
Can be set to null if namespace is supplied. This namespace context
must resolve the null prefix correctly, based on the different rules for
XSLT and XQuery.
//* @param defaultNamespace Default namespace to be used if no namespace is supplied and the
//* computed element is a string with no prefix.validation
- Required validation mode (e.g. STRICT, LAX, SKIP)inheritNamespaces
- true if child elements automatically inherit the namespaces of their parentschemaType
- The required schema type for the contentallowQName
- True if the elementName expression is allowed to return a QNameValue; false if
it must return a string, and is cast to a string if necessary
(that is, true in XQuery, false in XSLT).Method Detail |
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public Expression getNameExpression()
public Expression getNamespaceExpression()
public NamespaceResolver getNamespaceResolver()
public Expression simplify(ExpressionVisitor visitor) throws XPathException
ParentNodeConstructor
simplify
in class ParentNodeConstructor
visitor
- an expression visitor
XPathException
- if an error is discovered during expression
rewritingpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
Expression
This checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables may not be accurately known if they have not been explicitly declared.
If the implementation returns a value other than "this", then it is required to ensure that the location information in the returned expression have been set up correctly. It should not rely on the caller to do this, although for historical reasons many callers do so.
typeCheck
in class ParentNodeConstructor
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 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 ParentNodeConstructor
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 ItemType getItemType(TypeHierarchy th)
getItemType
in class ElementCreator
th
- the type hierarchy cache
public Iterator<Expression> iterateSubExpressions()
ParentNodeConstructor
iterateSubExpressions
in class ParentNodeConstructor
public boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression
in class ParentNodeConstructor
original
- the original subexpressionreplacement
- the replacement subexpression
protected void promoteInst(PromotionOffer offer) throws XPathException
promoteInst
in class ParentNodeConstructor
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 getElementName(XPathContext context, NodeInfo copiedNode) throws XPathException
getElementName
in class ElementCreator
context
- The evaluation context (not used)copiedNode
- Not applicable to this overload
XPathException
- if a failure occurspublic boolean isAllowNameAsQName()
public String getNewBaseURI(XPathContext context, NodeInfo copiedNode)
ElementCreator
getNewBaseURI
in class ElementCreator
context
- the XPath dynamic evaluation contextcopiedNode
- the node being copied (for xsl:copy), otherwise null
protected void outputNamespaceNodes(XPathContext context, Receiver out, NodeName nameCode, NodeInfo copiedNode) throws XPathException
outputNamespaceNodes
in class ElementCreator
context
- The execution contextout
- the Receiver where the namespace nodes are to be writtennameCode
- The name of the element node being outputcopiedNode
- Where this is a copied node, the node being copied
XPathException
public int getInstructionNameCode()
getInstructionNameCode
in class Instruction
public void explain(ExpressionPresenter out)
explain
in class Expression
out
- the expression presenter used to display the structure
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