net.sf.saxon.expr

Class CastAsQName

public class CastAsQName extends ComputedExpression

This class supports casting a string to a QName or a notation.
Constructor Summary
CastAsQName(Expression s, AtomicType target)
Method Summary
Expressionanalyze(StaticContext env, ItemType contextItemType)
intcomputeCardinality()
intcomputeSpecialProperties()
Determine the special properties of this expression
voiddisplay(int level, NamePool pool, PrintStream out)
ItemevaluateItem(XPathContext context)
intgetIntrinsicDependencies()
ItemTypegetItemType(TypeHierarchy th)
IteratoriterateSubExpressions()
Expressionoptimize(Optimizer opt, StaticContext env, ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
Expressionpromote(PromotionOffer offer)
ExpressiontypeCheck(StaticContext env, ItemType contextItemType)

Constructor Detail

CastAsQName

public CastAsQName(Expression s, AtomicType target)

Method Detail

analyze

public Expression analyze(StaticContext env, ItemType contextItemType)

computeCardinality

public int computeCardinality()

computeSpecialProperties

public int computeSpecialProperties()
Determine the special properties of this expression

Returns: NON_CREATIVE.

display

public void display(int level, NamePool pool, PrintStream out)

evaluateItem

public Item evaluateItem(XPathContext context)

getIntrinsicDependencies

public int getIntrinsicDependencies()

getItemType

public ItemType getItemType(TypeHierarchy th)

iterateSubExpressions

public Iterator iterateSubExpressions()

optimize

public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.

This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.

Parameters: opt the optimizer in use. This provides access to supporting functions; it also allows different optimization strategies to be used in different circumstances. env the static context of the expression contextItemType the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set to ITEM_TYPE

Returns: the original expression, rewritten if appropriate to optimize execution

Throws: net.sf.saxon.trans.StaticError if an error is discovered during this phase (typically a type error)

promote

public Expression promote(PromotionOffer offer)

typeCheck

public Expression typeCheck(StaticContext env, ItemType contextItemType)