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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.instruct.Instruction
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.expr.ComputedExpression |
locationId, staticProperties |
Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
Constructor Summary | |
DocumentInstr(boolean textOnly,
java.lang.String constantText,
java.lang.String baseURI)
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Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Perform static analysis of an expression and its subexpressions. |
boolean |
createsNewNodes()
Determine whether this instruction creates new nodes. |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
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. |
int |
getInstructionNameCode()
Get the name of this instruction for diagnostic and tracing purposes (the string "document-constructor") |
ItemType |
getItemType()
Get the item type of the items returned by evaluating this instruction |
java.util.Iterator |
iterateSubExpressions()
Get the immediate sub-expressions of this expression. |
TailCall |
processLeavingTail(XPathContext context)
ProcessLeavingTail: called to do the real work of this instruction. |
protected void |
promoteInst(PromotionOffer offer)
Handle promotion offers, that is, non-local tree rewrites. |
void |
setContent(Expression content)
Set the expression that constructs the content |
void |
setSchemaType(SchemaType type)
Set the SchemaType of the document element |
void |
setValidationAction(int action)
Set the validation action |
Expression |
simplify(StaticContext env)
Simplify an expression. |
Methods inherited from class net.sf.saxon.instruct.Instruction |
appendItem, assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, dynamicError, dynamicError, effectiveBooleanValue, evaluateAsString, getImplementationMethod, getInstructionInfo, getSourceLocator, isXSLT, iterate, process, promote |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface javax.xml.transform.SourceLocator |
getColumnNumber, getLineNumber, getPublicId, getSystemId |
Constructor Detail |
public DocumentInstr(boolean textOnly, java.lang.String constantText, java.lang.String baseURI)
Method Detail |
public void setContent(Expression content)
public void setValidationAction(int action)
public void setSchemaType(SchemaType type)
public Expression simplify(StaticContext env) throws XPathException
simplify
in interface Expression
simplify
in class Instruction
XPathException
- if an error is discovered during expression rewritingpublic Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException
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 Instruction
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)protected void promoteInst(PromotionOffer offer) throws XPathException
promoteInst
in class Instruction
offer
- The type of rewrite being offered
XPathException
public java.util.Iterator iterateSubExpressions()
iterateSubExpressions
in interface Expression
iterateSubExpressions
in class ComputedExpression
public final boolean createsNewNodes()
createsNewNodes
in class Instruction
public ItemType getItemType()
Instruction
getItemType
in interface Expression
getItemType
in class Instruction
public int getCardinality()
ComputedExpression
getCardinality
in interface Expression
getCardinality
in class ComputedExpression
public TailCall processLeavingTail(XPathContext context) throws XPathException
Instruction
processLeavingTail
in class Instruction
context
- The dynamic context of the transformation, giving access to the current node,
the current variables, etc.
XPathException
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class Instruction
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic int getInstructionNameCode()
getInstructionNameCode
in class Instruction
public void display(int level, NamePool pool, java.io.PrintStream out)
level
- indentation level for this expressionpool
- NamePool used to expand any names appearing in the expressionout
- Output destination
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