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java.lang.Object | +--net.sf.saxon.instruct.Instruction | +--net.sf.saxon.instruct.ExprInstruction | +--net.sf.saxon.instruct.DocumentInstr
An instruction to create a document node. This doesn't correspond directly to any XSLT instruction. It is used to support the document node constructor expression in XQuery, and is used as a sub-instruction within an xsl:variable that constructs a temporary tree.
Conceptually it represents an XSLT instruction xsl:document-node, with no attributes, whose content is a complex content constructor for the children of the document node.
Field Summary |
Fields inherited from class net.sf.saxon.instruct.Instruction |
children |
Constructor Summary | |
DocumentInstr(boolean textOnly,
java.lang.String constantText,
java.lang.String baseURI)
|
Method Summary | |
Expression |
analyze(StaticContext env)
Perform static analysis of an expression and its subexpressions. |
void |
display(int level,
NamePool pool)
Display this instruction as an expression, for diagnostics |
Item |
evaluateItem(XPathContext context)
Evaluate as an expression. |
int |
getCardinality()
Determine the static cardinality of the expression. |
java.lang.String |
getInstructionName()
Get the name of this instruction for diagnostic and tracing purposes (the string "document-constructor") |
ItemType |
getItemType()
Determine the data type of the expression, if possible. |
void |
getXPathExpressions(java.util.List list)
Get all the XPath expressions associated with this instruction (in XSLT terms, the expression present on attributes of the instruction, as distinct from the child instructions in a sequence construction) |
TailCall |
processLeavingTail(XPathContext context)
ProcessLeavingTail: called to do the real work of this instruction. |
void |
promoteInst(PromotionOffer offer)
Offer promotion for subexpressions. |
void |
setSchemaType(SchemaType type)
Set the SchemaType of the document element |
void |
setValidationAction(int action)
Set the validation action |
Methods inherited from class net.sf.saxon.instruct.ExprInstruction |
effectiveBooleanValue, evaluateAsString, getDependencies, getSpecialProperties, getSubExpressions, iterate, promote, simplify |
Methods inherited from class net.sf.saxon.instruct.Instruction |
assembleParams, assembleTunnelParams, displayChildren, dynamicError, dynamicError, getChildren, getColumnNumber, getExecutable, 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 |
Constructor Detail |
public DocumentInstr(boolean textOnly, java.lang.String constantText, java.lang.String baseURI)
Method Detail |
public void setValidationAction(int action)
public void setSchemaType(SchemaType type)
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 getXPathExpressions(java.util.List list)
ExprInstruction
getXPathExpressions
in class ExprInstruction
list
- A list to be populated with the list of XPath expressionspublic 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 detectedpublic TailCall processLeavingTail(XPathContext context) throws javax.xml.transform.TransformerException
Instruction
processLeavingTail
in interface Instr
processLeavingTail
in class Instruction
context
- The dynamic context of the transformation, giving access to the current node,
the current variables, etc.
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
expressionpublic java.lang.String getInstructionName()
getInstructionName
in class Instruction
public void display(int level, NamePool pool)
level
- indentation level for this expression
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