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java.lang.Object | +--net.sf.saxon.instruct.Instruction | +--net.sf.saxon.instruct.ExprInstruction | +--net.sf.saxon.instruct.ElementCreator
An instruction that creates an element node. There are two subtypes, FixedElement for use where the name is known statically, and Element where it is computed dynamically. To allow use in both XSLT and XQuery, the class acts both as an Instruction and as an Expression.
Field Summary | |
protected SchemaType |
schemaType
|
protected AttributeSet[] |
useAttributeSets
|
protected int |
validation
|
protected ValidationContext |
validationContext
|
Fields inherited from class net.sf.saxon.instruct.Instruction |
children |
Constructor Summary | |
ElementCreator()
|
Method Summary | |
Expression |
analyze(StaticContext env)
Perform static analysis of an expression and its subexpressions. |
Item |
evaluateItem(XPathContext context)
Evaluate as an expression. |
int |
getCardinality()
Determine the static cardinality of the expression. |
ItemType |
getItemType()
Determine the data type of the expression, if possible. |
protected abstract int |
getNameCode(XPathContext context)
|
ValidationContext |
getValidationContext()
Get the validation context for the constructed element |
int |
getValidationMode()
Get the validation mode for the constructed element |
protected abstract void |
outputNamespaceNodes(XPathContext context,
Receiver receiver)
Callback to output namespace nodes for the new element. |
TailCall |
processLeavingTail(XPathContext context)
Evaluate the instruction to produce a new element node |
void |
promoteInst(PromotionOffer offer)
Offer promotion for subexpressions. |
void |
setValidationContext(ValidationContext context)
Set the validation context for the new element |
void |
setValidationMode(int mode)
Set the validation mode for the new element |
Methods inherited from class net.sf.saxon.instruct.ExprInstruction |
effectiveBooleanValue, evaluateAsString, getDependencies, getSpecialProperties, getSubExpressions, getXPathExpressions, iterate, promote, simplify |
Methods inherited from class net.sf.saxon.instruct.Instruction |
assembleParams, assembleTunnelParams, displayChildren, dynamicError, dynamicError, getChildren, getColumnNumber, getExecutable, getInstructionName, getInstructionNamespace, getLineNumber, getPublicId, getSourceLocator, getSystemId, process, processChildren, processChildrenLeavingTail, recoverableError, setChildren, setExecutable, setSourceLocation |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface net.sf.saxon.expr.Expression |
display |
Field Detail |
protected AttributeSet[] useAttributeSets
protected SchemaType schemaType
protected int validation
protected ValidationContext validationContext
Constructor Detail |
public ElementCreator()
Method Detail |
public ItemType getItemType()
Expression
This method should always return a result, though it may be the best approximation that is available at the time.
getItemType
in interface Expression
getItemType
in class Instruction
public int getCardinality()
Expression
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.
This method should always return a result, though it may be the best approximation that is available at the time.
getCardinality
in interface Expression
getCardinality
in class Instruction
public Expression analyze(StaticContext env) throws XPathException
ExprInstruction
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 will only be accurately known if they have been explicitly declared.
analyze
in interface Expression
analyze
in class ExprInstruction
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)public void setValidationMode(int mode)
public int getValidationMode()
public void setValidationContext(ValidationContext context)
public ValidationContext getValidationContext()
public void promoteInst(PromotionOffer offer) throws XPathException
promoteInst
in class ExprInstruction
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 detectedprotected abstract int getNameCode(XPathContext context) throws javax.xml.transform.TransformerException
javax.xml.transform.TransformerException
protected abstract void outputNamespaceNodes(XPathContext context, Receiver receiver) throws javax.xml.transform.TransformerException
context
- The execution contextreceiver
- the Receiver where the namespace nodes are to be written
javax.xml.transform.TransformerException
public TailCall processLeavingTail(XPathContext context) throws javax.xml.transform.TransformerException
processLeavingTail
in interface Instr
processLeavingTail
in class Instruction
context
-
javax.xml.transform.TransformerException
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class ExprInstruction
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expression
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