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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.CastAsQName
This class supports casting a string to a QName
Field Summary |
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
CastAsQName(Expression s)
|
Method Summary | |
Expression |
analyze(StaticContext env)
Perform static analysis of an expression and its subexpressions. |
int |
computeCardinality()
|
void |
display(int level,
NamePool pool)
Diagnostic print of expression structure. |
Item |
evaluateItem(XPathContext context)
Evaluate an expression as a single item. |
int |
getIntrinsicDependencies()
Determine the intrinsic dependencies of an expression, that is, those which are not derived from the dependencies of its subexpressions. |
ItemType |
getItemType()
Determine the data type of the expression, if possible. |
Expression[] |
getSubExpressions()
Get the immediate sub-expressions of this expression. |
Expression |
promote(PromotionOffer offer)
Offer promotion for this subexpression. |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeSpecialProperties, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getDependencies, getLineNumber, getSpecialProperties, iterate, markTailFunctionCalls, setLineNumber, simplify, typeError |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public CastAsQName(Expression s)
Method Detail |
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 Expression promote(PromotionOffer offer) throws XPathException
ComputedExpression
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 int computeCardinality()
computeCardinality
in class ComputedExpression
public ItemType getItemType()
Expression
This method should always return a result, though it may be the best approximation that is available at the time.
public int getIntrinsicDependencies()
ComputedExpression
getIntrinsicDependencies
in class ComputedExpression
public Expression[] getSubExpressions()
ComputedExpression
getSubExpressions
in interface Expression
getSubExpressions
in class ComputedExpression
public Item evaluateItem(XPathContext context) throws XPathException
ComputedExpression
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
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)
Expression
level
- indentation level for this expression
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