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java.lang.Object | +--net.sf.saxon.instruct.Instruction | +--net.sf.saxon.instruct.ExprInstruction | +--net.sf.saxon.instruct.ValueOf
An xsl:value-of element in the stylesheet.
The xsl:value-of element takes attributes:
Constructor Summary | |
ValueOf(Expression select,
boolean disable)
|
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 an expression as a single item. |
int |
getDependencies()
Determine which aspects of the context the expression depends on. |
SequenceType |
getResultType()
Get the static type of the value returned by the instruction |
void |
getXPathExpressions(java.util.List list)
|
TailCall |
processLeavingTail(XPathContext context)
ProcessLeavingTail: called to do the real work of this instruction. |
void |
promoteInst(PromotionOffer offer)
Offer promotion for subexpressions. |
void |
setInstructionDetails(Controller controller,
NamePool namePool,
InstructionDetails details)
Get the name of this instruction for diagnostic and tracing purposes |
Methods inherited from class net.sf.saxon.instruct.ExprInstruction |
effectiveBooleanValue, evaluateAsString, getCardinality, getItemType, getSpecialProperties, getSubExpressions, iterate, promote, simplify |
Methods inherited from class net.sf.saxon.instruct.Instruction |
assembleParams, assembleTunnelParams, getChildren, getInstructionDetails, getInstructionName, getLineNumber, getSystemId, process, processChildren, processChildrenLeavingTail, recoverableError, setChildren, setSourceLocation, styleError, styleError |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public ValueOf(Expression select, boolean disable)
Method Detail |
public void setInstructionDetails(Controller controller, NamePool namePool, InstructionDetails details)
setInstructionDetails
in class Instruction
public Expression analyze(StaticContext env) 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 will only be accurately known if they have been explicitly declared.
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)public int getDependencies()
Expression
getDependencies
in interface Expression
getDependencies
in class ExprInstruction
public void getXPathExpressions(java.util.List list)
getXPathExpressions
in class ExprInstruction
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 detectedpublic SequenceType getResultType()
Instruction
getResultType
in class Instruction
public TailCall processLeavingTail(XPathContext context) throws javax.xml.transform.TransformerException
Instruction
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
Expression
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 void display(int level, NamePool pool)
level
- indentation level for this expression
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