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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.IfExpression
An IfExpression returns the value of either the "then" part or the "else" part, depending on the value of the condition
Field Summary |
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
IfExpression(Expression condition,
Expression thenExp,
Expression elseExp)
Constructor |
Method Summary | |
Expression |
analyze(StaticContext env)
Type-check the expression |
int |
computeCardinality()
Determine the static cardinality of the result |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
void |
display(int level,
NamePool pool)
Diagnostic print of expression structure |
Item |
evaluateItem(XPathContext context)
Evaluate the conditional expression in a given context |
ItemType |
getItemType()
Get data type of items in sequence returned by expression |
Expression[] |
getSubExpressions()
Get the immediate subexpressions of this expression |
SequenceIterator |
iterate(XPathContext context)
Iterate the path-expression in a given context |
boolean |
markTailFunctionCalls()
Mark tail calls on used-defined functions. |
void |
process(XPathContext context)
Process this expression as an instruction, writing results to the current outputter |
TailCall |
processLeavingTail(XPathContext context)
Process the instruction, optionally returning an uncompleted tail call to be invoked by the caller |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
Expression |
simplify()
Simplify an expression |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSourceLocator, getSpecialProperties, setLineNumber, typeError |
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.instruct.Locatable |
getSourceLocator |
Constructor Detail |
public IfExpression(Expression condition, Expression thenExp, Expression elseExp)
Method Detail |
public Expression simplify() throws XPathException
simplify
in interface Expression
simplify
in class ComputedExpression
XPathException
- if an error is discovered during expression
rewritingpublic Expression analyze(StaticContext env) throws XPathException
analyze
in interface Expression
env
- the static context of the expression
XPathException
public Expression promote(PromotionOffer offer) throws XPathException
promote
in interface Expression
promote
in class ComputedExpression
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 Expression[] getSubExpressions()
getSubExpressions
in interface Expression
getSubExpressions
in class ComputedExpression
public boolean markTailFunctionCalls()
markTailFunctionCalls
in class ComputedExpression
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
context
- the evaluation context
XPathException
- if any dynamic error occurs evaluating the
expressionpublic SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
context
- the evaluation context
XPathException
- if any dynamic error occurs evaluating the
expressionpublic void process(XPathContext context) throws javax.xml.transform.TransformerException
process
in interface Instr
context
- The dynamic context, giving access to the current node,
the current variables, etc.
javax.xml.transform.TransformerException
public TailCall processLeavingTail(XPathContext context) throws javax.xml.transform.TransformerException
processLeavingTail
in interface Instr
context
- The dynamic context, giving access to the current node,
the current variables, etc.
javax.xml.transform.TransformerException
public ItemType getItemType()
getItemType
in interface Expression
public int computeCardinality()
computeCardinality
in class ComputedExpression
public int computeSpecialProperties()
computeSpecialProperties
in class ComputedExpression
public void display(int level, NamePool pool)
display
in interface Expression
level
- indentation level for this expression
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