net.sf.saxon.instruct
public class NumberInstruction extends ComputedExpression
Constructor Summary | |
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NumberInstruction(Configuration config, Expression select, int level, Pattern count, Pattern from, Expression value, Expression format, Expression groupSize, Expression groupSeparator, Expression letterValue, Expression ordinal, Expression lang, NumberFormatter formatter, Numberer numberer, boolean hasVariablesInPatterns, boolean backwardsCompatible) |
Method Summary | |
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int | computeCardinality() |
void | display(int level, NamePool pool, PrintStream out)
Diagnostic print of expression structure. |
Item | evaluateItem(XPathContext context) |
int | getIntrinsicDependencies()
Determine the intrinsic dependencies of an expression, that is, those which are not derived
from the dependencies of its subexpressions. |
ItemType | getItemType(TypeHierarchy th) |
Iterator | iterateSubExpressions()
Get the immediate sub-expressions of this expression. |
static Numberer | makeNumberer(String language, String country, XPathContext context)
Load a Numberer class for a given language and check it is OK. |
Expression | optimize(Optimizer opt, StaticContext env, ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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Expression | promote(PromotionOffer offer)
Offer promotion for this subexpression. |
Expression | simplify(StaticContext env) |
Expression | typeCheck(StaticContext env, ItemType contextItemType)
Perform static analysis of an expression and its subexpressions.
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Parameters: level indentation level for this expression out
Returns: a set of bit-significant flags identifying the "intrinsic" dependencies. The flags are documented in class net.sf.saxon.value.StaticProperty
Returns: an iterator containing the sub-expressions of this expression
Parameters: language the language for which a Numberer is required
Returns: a suitable numberer. If no specific numberer is available for the language, the default (English) numberer is used.
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)
Parameters: 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
Returns: if the offer is not accepted, return this expression unchanged. Otherwise return the result of rewriting the expression to promote this subexpression
Throws: net.sf.saxon.trans.XPathException if any error is detected
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.
Parameters: env the static context of the expression
Returns: the original expression, rewritten to perform necessary run-time type checks, and to perform other type-related optimizations
Throws: net.sf.saxon.trans.StaticError if an error is discovered during this phase (typically a type error)