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java.lang.Object | +--net.sf.saxon.instruct.Instruction | +--net.sf.saxon.instruct.ExprInstruction | +--net.sf.saxon.instruct.SimpleNodeConstructor | +--net.sf.saxon.instruct.ValueOf
An xsl:value-of element in the stylesheet.
The xsl:value-of element takes attributes:
Field Summary |
Fields inherited from class net.sf.saxon.instruct.SimpleNodeConstructor |
select, separator |
Fields inherited from class net.sf.saxon.instruct.Instruction |
children |
Constructor Summary | |
ValueOf(Expression select,
boolean disable)
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Method Summary | |
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 |
ItemType |
getItemType()
Determine the data type of the expression, if possible. |
TailCall |
processLeavingTail(XPathContext context)
ProcessLeavingTail: called to do the real work of this instruction. |
void |
promoteInst(PromotionOffer offer)
Offer promotion for subexpressions. |
void |
typeCheck(StaticContext env)
|
Methods inherited from class net.sf.saxon.instruct.SimpleNodeConstructor |
analyze, evaluateNameCode, expandChildren, getXPathExpressions, setSelect, setSeparator |
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 ValueOf(Expression select, boolean disable)
Method Detail |
public java.lang.String getInstructionName()
getInstructionName
in class Instruction
public void promoteInst(PromotionOffer offer) throws XPathException
promoteInst
in class SimpleNodeConstructor
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 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 void typeCheck(StaticContext env) throws XPathException
typeCheck
in class SimpleNodeConstructor
XPathException
public 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
SimpleNodeConstructor
evaluateItem
in interface Expression
evaluateItem
in class SimpleNodeConstructor
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)
display
in interface Expression
display
in class SimpleNodeConstructor
level
- indentation level for this expression
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